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Message-ID: <Y/05Nizuc+VJ7GNU@smile.fi.intel.com>
Date:   Tue, 28 Feb 2023 01:13:58 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, linux-gpio@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org,
        Thorsten Leemhuis <regressions@...mhuis.info>
Subject: Re: INFO: REPRODUCED: memory leak in gpio device in 6.2-rc6

On Mon, Feb 27, 2023 at 07:38:01PM +0100, Mirsad Todorovac wrote:
> On 2/24/23 18:40, Andy Shevchenko wrote:
> > On Fri, Feb 24, 2023 at 04:12:31PM +0100, Mirsad Todorovac wrote:
> > > On 2/21/23 16:39, Andy Shevchenko wrote:
> > > > On Tue, Feb 21, 2023 at 02:52:38PM +0100, Mirsad Goran Todorovac wrote:
> > > > > On 20. 02. 2023. 14:43, Andy Shevchenko wrote:
> > > > > > On Mon, Feb 20, 2023 at 02:10:00PM +0100, Mirsad Todorovac wrote:
> > > > > > > On 2/16/23 15:16, Bartosz Golaszewski wrote:

...

> > > > > > > As Mr. McKenney once said, a bunch of monkeys with keyboard could
> > > > > > > have done it in a considerable number of trials and errors ;-)
> > > > > > > 
> > > > > > > But here I have something that could potentially leak as well. I could not devise a
> > > > > > > reproducer due to the leak being lightly triggered only in extreme memory contention.
> > > > > > > 
> > > > > > > See it for yourself:
> > > > > > > 
> > > > > > > drivers/gpio/gpio-sim.c:
> > > > > > >    301 static int gpio_sim_setup_sysfs(struct gpio_sim_chip *chip)
> > > > > > >    302 {
> > > > > > >    303         struct device_attribute *val_dev_attr, *pull_dev_attr;
> > > > > > >    304         struct gpio_sim_attribute *val_attr, *pull_attr;
> > > > > > >    305         unsigned int num_lines = chip->gc.ngpio;
> > > > > > >    306         struct device *dev = chip->gc.parent;
> > > > > > >    307         struct attribute_group *attr_group;
> > > > > > >    308         struct attribute **attrs;
> > > > > > >    309         int i, ret;
> > > > > > >    310
> > > > > > >    311         chip->attr_groups = devm_kcalloc(dev, sizeof(*chip->attr_groups),
> > > > > > >    312                                          num_lines + 1, GFP_KERNEL);
> > > > > > >    313         if (!chip->attr_groups)
> > > > > > >    314                 return -ENOMEM;
> > > > > > >    315
> > > > > > >    316         for (i = 0; i < num_lines; i++) {
> > > > > > >    317                 attr_group = devm_kzalloc(dev, sizeof(*attr_group), GFP_KERNEL);
> > > > > > >    318                 attrs = devm_kcalloc(dev, GPIO_SIM_NUM_ATTRS, sizeof(*attrs),
> > > > > > >    319                                      GFP_KERNEL);
> > > > > > >    320                 val_attr = devm_kzalloc(dev, sizeof(*val_attr), GFP_KERNEL);
> > > > > > >    321                 pull_attr = devm_kzalloc(dev, sizeof(*pull_attr), GFP_KERNEL);
> > > > > > >    322                 if (!attr_group || !attrs || !val_attr || !pull_attr)
> > > > > > >    323                         return -ENOMEM;
> > > > > > >    324
> > > > > > >    325                 attr_group->name = devm_kasprintf(dev, GFP_KERNEL,
> > > > > > >    326                                                   "sim_gpio%u", i);
> > > > > > >    327                 if (!attr_group->name)
> > > > > > >    328                         return -ENOMEM;
> > > > > > > 
> > > > > > > Apparently, if the memory allocation only partially succeeds, in the theoretical case
> > > > > > > that the system is close to its kernel memory exhaustion, `return -ENOMEM` would not
> > > > > > > free the partially succeeded allocs, would it?
> > > > > > > 
> > > > > > > To explain it better, I tried a version that is not yet full doing "all or nothing"
> > > > > > > memory allocation for the gpio-sim driver, because I am not that familiar with the
> > > > > > > driver internals.
> > > > > > 
> > > > > > devm_*() mean that the resource allocation is made in a managed manner, so when
> > > > > > it's done, it will be freed automatically.
> > > > > 
> > > > > Didn't see that one coming ... :-/ "buzzing though the bush ..."
> > > > > 
> > > > > > The question is: is the lifetime of the attr_groups should be lesser or the
> > > > > > same as chip->gc.parent? Maybe it's incorrect to call devm_*() in the first place?
> > > > > 
> > > > > Bona fide said, I hope that automatic deallocation does things in the right order.
> > > > > I've realised that devm_kzalloc() calls devm_kmalloc() that registers allocations on
> > > > > a per driver list. But I am not sure how chip->gc was allocated?
> > > > > 
> > > > > Here is said it is allocated in drivers/gpio/gpio-sim.c:386 in gpio_sim_add_bank(),
> > > > > as a part of
> > > > > 
> > > > > 	struct gpio_sim_chip *chip;
> > > > > 	struct gpio_chip *gc;
> > > > > 
> > > > > 	gc = &chip->gc;
> > > > > 
> > > > > and gc->parent is set to
> > > > > 
> > > > > 	gc->parent = dev;
> > > > > 
> > > > > in line 420, which appears called before gpio_sim_setup_sysfs() and the lines above.
> > > > > 
> > > > > If I understood well, automatic deallocation on unloading the driver goes
> > > > > in the reverse order, so lifetime of chip appears to be longer than attr_groups,
> > > > > but I am really not that good at this ...
> > > > 
> > > > So, the device is instantiated by platform_device_register_full().
> > > > 
> > > > It should gone with the platform_device_unregister().
> > > > 
> > > > In case of CONFIG_DEBUG_KOBJECT_RELEASE=y the ->release() can be called
> > > > asynchronously.
> > > > 
> > > > So, there are following questions:
> > > > - is the put_device() is actually called?
> > > > - is the above mentioned option is set to Y?
> > > > - if it's in Y, does kmemleak take it into account?
> > > > - if no, do you get anything new in `dmesg` when enable it?
> > > 
> > > Hi, Andy,
> > > 
> > > Having set CONFIG_DEBUG_KOBJECT=y.
> > > CONFIG_DEBUG_KOBJECT_RELEASE=y and CONFIG_DEBUG_OBJECTS_TIMERS=y disappear after "make olddefconfig"
> > > 
> > > So, I cannot tell about whether release() was called asynchronously, all I get is (after driver unload):
> > > 
> > > [  810.989742] kobject: 'gpio-sim' (00000000251afa19): kobject_cleanup, parent 00000000447da7a7
> > > [  810.990216] kobject: 'gpio-sim' (00000000251afa19): auto cleanup kobject_del
> > > [  810.990674] kobject: 'gpio-sim' (00000000251afa19): auto cleanup 'remove' event
> > > [  810.991175] kobject: 'gpio-sim' (00000000251afa19): kobject_uevent_env
> > > [  810.991674] kobject: 'gpio-sim' (00000000251afa19): fill_kobj_path: path = '/bus/platform/drivers/gpio-sim'
> > > [  810.992154] kobject: 'gpio-sim' (00000000251afa19): calling ktype release
> > > [  810.992644] kobject: 'gpio-sim': free name
> > > 
> > > I am still trying to convince "make olddefconfig" to accept the above values he did not like :-/
> > 
> > Btw, since devm_*() is in use, you may enable trace events (I have added them a
> > few releases back) and see how objects allocated with devm are getting
> > released.
> > 
> > Before that there is a possibility to enable debug for devm.
> > CONFIG_DEBUG_DEVRES for that (you may see how it's used in the
> > drivers/base/devres.c).
> 
> The loga are extensive if you are willing to skim over them, but I believe the interesting
> part is this:

I'm not sure I understand where the problem is.

> [ 4830.764748] kobject: 'gpio-sim' (000000005b8d0726): kobject_release, parent 000000007425b13f (delayed 750)
> [ 4833.908238] kobject: 'gpio-sim' (000000005b8d0726): kobject_cleanup, parent 000000007425b13f
> [ 4833.908244] kobject: 'gpio-sim' (000000005b8d0726): auto cleanup kobject_del
> [ 4833.908245] kobject: 'gpio-sim' (000000005b8d0726): auto cleanup 'remove' event
> [ 4833.908247] kobject: 'gpio-sim' (000000005b8d0726): kobject_uevent_env
> [ 4833.908273] kobject: 'gpio-sim' (000000005b8d0726): fill_kobj_path: path = '/bus/platform/drivers/gpio-sim'
> [ 4833.908311] kobject: 'gpio-sim' (000000005b8d0726): calling ktype release
> [ 4833.908315] kobject: 'gpio-sim': free name
> [ 4834.932303] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_release, parent 0000000093357d30 (delayed 250)
> [ 4835.952388] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_cleanup, parent 0000000093357d30
> [ 4835.952413] kobject: 'gpio_sim' (0000000096ea0bb1): auto cleanup kobject_del
> [ 4835.952415] kobject: 'gpio_sim' (0000000096ea0bb1): auto cleanup 'remove' event
> [ 4835.952416] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_uevent_env
> [ 4835.952424] kobject: 'gpio_sim' (0000000096ea0bb1): fill_kobj_path: path = '/module/gpio_sim'
> [ 4835.952445] kobject: 'gpio_sim' (0000000096ea0bb1): calling ktype release
> [ 4835.952448] kobject: 'gpio_sim': free name
> 
> Or, with CONFIG_DEBUG_DEVRES=y, it looks like this:

I don't see that been enabled (it requires to pass a command line option to the kernel).

> [  180.472131] kobject: 'gpio-sim' (00000000e72df678): kobject_release, parent 0000000053a50b05 (delayed 250)
> [  180.472270] kobject: 'drivers' (00000000a3c60031): kobject_release, parent 00000000363d6076 (delayed 250)
> [  180.472274] kobject: 'holders' (000000006bd5c478): kobject_release, parent 00000000363d6076 (delayed 250)
> [  180.472281] kobject: 'notes' (00000000c85ae91b): kobject_release, parent 00000000363d6076 (delayed 1000)
> [  181.495687] kobject: 'holders' (000000006bd5c478): kobject_cleanup, parent 00000000363d6076
> [  181.495693] kobject: 'holders' (000000006bd5c478): auto cleanup kobject_del
> [  181.495696] kobject: 'holders' (000000006bd5c478): calling ktype release
> [  181.495697] kobject: (000000006bd5c478): dynamic_kobj_release
> [  181.495703] kobject: 'holders': free name
> [  181.495717] kobject: 'drivers' (00000000a3c60031): kobject_cleanup, parent 00000000363d6076
> [  181.495719] kobject: 'drivers' (00000000a3c60031): auto cleanup kobject_del
> [  181.495723] kobject: 'drivers' (00000000a3c60031): calling ktype release
> [  181.495724] kobject: (00000000a3c60031): dynamic_kobj_release
> [  181.495727] kobject: 'drivers': free name
> [  181.495728] kobject: 'gpio-sim' (00000000e72df678): kobject_cleanup, parent 0000000053a50b05
> [  181.495730] kobject: 'gpio-sim' (00000000e72df678): auto cleanup kobject_del
> [  181.495731] kobject: 'gpio-sim' (00000000e72df678): auto cleanup 'remove' event
> [  181.495733] kobject: 'gpio-sim' (00000000e72df678): kobject_uevent_env
> [  181.495742] kobject: 'gpio-sim' (00000000e72df678): fill_kobj_path: path = '/bus/platform/drivers/gpio-sim'
> [  181.495764] kobject: 'gpio-sim' (00000000e72df678): calling ktype release
> [  181.495768] kobject: 'gpio-sim': free name
> [  184.663810] kobject: 'notes' (00000000c85ae91b): kobject_cleanup, parent 00000000363d6076
> [  184.663816] kobject: 'notes' (00000000c85ae91b): auto cleanup kobject_del
> [  184.663824] kobject: 'notes' (00000000c85ae91b): calling ktype release
> [  184.663838] kobject: (00000000c85ae91b): dynamic_kobj_release
> [  184.663841] kobject: 'notes': free name
> [  184.663843] kobject: 'gpio_sim' (00000000363d6076): kobject_release, parent 00000000dfc73d50 (delayed 500)
> [  186.679811] kobject: 'gpio_sim' (00000000363d6076): kobject_cleanup, parent 00000000dfc73d50
> [  186.679817] kobject: 'gpio_sim' (00000000363d6076): auto cleanup kobject_del
> [  186.679819] kobject: 'gpio_sim' (00000000363d6076): auto cleanup 'remove' event
> [  186.679820] kobject: 'gpio_sim' (00000000363d6076): kobject_uevent_env
> [  186.679832] kobject: 'gpio_sim' (00000000363d6076): fill_kobj_path: path = '/module/gpio_sim'
> [  186.679855] kobject: 'gpio_sim' (00000000363d6076): calling ktype release
> [  186.679859] kobject: 'gpio_sim': free name
> 
> Here are the /var/log/messages and `dmesg | grep gpio` output:
> 
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (0000000065b01c31): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip512' (000000008b9638a5): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000e7ddc5ce): kobject_release, parent 000000007063b679 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000052bfa782): kobject_release, parent 0000000017e526f4 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000007e927b76): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip513' (00000000307a0461): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000007025cedf): kobject_release, parent 00000000c6873be9 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (000000002030b0fc): kobject_release, parent 00000000cd2bbef4 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000008afdcce8): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip514' (000000008e860d8b): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000dc5ac60d): kobject_release, parent 0000000034808fa5 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000401b009a): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000b0dfd44e): kobject_release, parent 000000001a955210 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000a1399cd0): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip515' (000000002b851bb5): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000276535c4): kobject_release, parent 00000000f89849bd (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000b204b566): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000581391d9): kobject_release, parent 000000002a3e415e (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000babdf5db): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip531' (00000000ad4538e8): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (0000000045377336): kobject_release, parent 00000000e06680f5 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000554e0e6d): kobject_release, parent 000000003fe8f71b (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000008b98f863): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip532' (00000000ac07803f): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (0000000007a45939): kobject_release, parent 000000004ef2dca6 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (0000000034300a6b): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000089fb2874): kobject_release, parent 00000000f81b3244 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000dedc22f2): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip533' (000000003541481f): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000002d7008b9): kobject_release, parent 00000000a22546a6 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000bbace83b): kobject_release, parent 0000000050fa69b3 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000e467cb12): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip549' (0000000014379c6d): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000186d3bd6): kobject_release, parent 000000006b8d9c99 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000bb358104): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000ab70f947): kobject_release, parent 000000000876b849 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (0000000016f05b5a): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip551' (00000000a55e630b): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000948e7c59): kobject_release, parent 00000000cb0b3463 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000461517ae): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000b41576d9): kobject_release, parent 0000000060e34f22 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000176df109): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip552' (000000001750e50f): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000008026d597): kobject_release, parent 00000000bdaa0a47 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.1' (0000000018f833bf): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (000000005a55ef16): kobject_release, parent 000000008dc012bc (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000886e1a77): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip553' (0000000010cfe833): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000d8b3d64b): kobject_release, parent 00000000e3becc55 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (000000002e06f814): kobject_release, parent 00000000a555c1b2 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000002835f4a4): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip554' (00000000e0038afb): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000004e7dad05): kobject_release, parent 00000000b39a3c5f (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000bfef6047): kobject_release, parent 00000000b8559267 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (00000000d962e90a): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip555' (00000000f5bbd198): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000af8b42a8): kobject_release, parent 0000000051b24fd2 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (000000008ef7f514): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000041578d2d): kobject_release, parent 00000000b738a3e4 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: gpio-sim: probe of gpio-sim.0 failed with error -34
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (000000005418b2af): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (000000001f644365): kobject_release, parent 00000000515b4b1b (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: gpio-560 (?): hogged as input
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000006cce49d7): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip556' (00000000d2b04f32): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000843ea14e): kobject_release, parent 00000000dc27f1aa (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000030fbb9d7): kobject_release, parent 000000001576402e (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000007164bff6): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip564' (00000000ee87da7b): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000009eaeda39): kobject_release, parent 0000000092a079b6 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (000000006053a4bf): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000032fe601a): kobject_release, parent 0000000063e66fd0 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (0000000012ac3b4a): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip572' (00000000178509ff): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (0000000018c19582): kobject_release, parent 00000000b0535d8d (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000c56fc456): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000095747aa3): kobject_release, parent 00000000c314f13a (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000000333f422): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip580' (00000000f6371a1e): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000006dc3da55): kobject_release, parent 000000002be607c1 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (000000000471ebbe): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (000000008cc134db): kobject_release, parent 000000008af54826 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (0000000005a238f5): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip588' (0000000075b76b85): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (000000003f03127c): kobject_release, parent 000000006ee06561 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (0000000048f1330d): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (0000000023dec04e): kobject_release, parent 000000005fd3b6d2 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (0000000064e73453): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip589' (000000007e1cf13a): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000cdec14e3): kobject_release, parent 00000000a8ca1f8c (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000f462f78a): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000b5aa4b07): kobject_release, parent 00000000ea466ae7 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio' (000000001bd064f6): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpiochip597' (00000000a32f70da): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: '(null)' (00000000aab83a1c): kobject_release, parent 000000008385ae47 (delayed 1000)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:32 pc-mtodorov kernel: kobject: 'node0' (00000000c6c3323c): kobject_release, parent 00000000c2405972 (delayed 250)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node2' (0000000017e526f4): kobject_release, parent 00000000d00083c8 (delayed 500)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node3' (00000000cd2bbef4): kobject_release, parent 00000000d00083c8 (delayed 250)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'gpiochip3' (00000000f89849bd): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node8' (0000000050fa69b3): kobject_release, parent 00000000d00083c8 (delayed 250)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'gpiochip11' (00000000b39a3c5f): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'gpiochip12' (0000000051b24fd2): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node15' (00000000515b4b1b): kobject_release, parent 00000000d00083c8 (delayed 750)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node17' (0000000063e66fd0): kobject_release, parent 00000000d00083c8 (delayed 500)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node20' (000000005fd3b6d2): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node19' (000000008af54826): kobject_release, parent 00000000d00083c8 (delayed 750)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node21' (00000000ea466ae7): kobject_release, parent 00000000d00083c8 (delayed 500)
> Feb 27 19:00:33 pc-mtodorov kernel: kobject: 'node22' (00000000c2405972): kobject_release, parent 00000000d00083c8 (delayed 750)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip2' (0000000034808fa5): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip4' (00000000e06680f5): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'node7' (00000000f81b3244): kobject_release, parent 00000000d00083c8 (delayed 500)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip5' (000000004ef2dca6): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip7' (000000006b8d9c99): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip9' (00000000bdaa0a47): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'node10' (0000000060e34f22): kobject_release, parent 00000000d00083c8 (delayed 250)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip8' (00000000cb0b3463): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'node13' (00000000b8559267): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip14' (0000000092a079b6): kobject_release, parent 0000000000000000 (delayed 1000)
> Feb 27 19:00:34 pc-mtodorov kernel: kobject: 'gpiochip15' (00000000b0535d8d): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'gpiochip1' (00000000c6873be9): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node4' (000000001a955210): kobject_release, parent 00000000d00083c8 (delayed 250)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node12' (00000000a555c1b2): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node6' (000000003fe8f71b): kobject_release, parent 00000000d00083c8 (delayed 750)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node9' (000000000876b849): kobject_release, parent 00000000d00083c8 (delayed 750)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'gpiochip17' (000000006ee06561): kobject_release, parent 0000000000000000 (delayed 750)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node16' (000000001576402e): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'gpiochip13' (00000000dc27f1aa): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:35 pc-mtodorov kernel: kobject: 'node14' (00000000b738a3e4): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip0' (000000007063b679): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'node5' (000000002a3e415e): kobject_release, parent 00000000d00083c8 (delayed 1000)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip10' (00000000e3becc55): kobject_release, parent 0000000000000000 (delayed 500)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'node11' (000000008dc012bc): kobject_release, parent 00000000d00083c8 (delayed 500)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip6' (00000000a22546a6): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'node18' (00000000c314f13a): kobject_release, parent 00000000d00083c8 (delayed 250)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip16' (000000002be607c1): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:36 pc-mtodorov kernel: kobject: 'gpiochip19' (000000008385ae47): kobject_release, parent 0000000000000000 (delayed 250)
> Feb 27 19:00:43 pc-mtodorov kernel: kobject: 'gpio-sim' (000000005b8d0726): kobject_release, parent 000000007425b13f (delayed 750)
> Feb 27 19:00:43 pc-mtodorov kernel: kobject: 'drivers' (00000000bca28211): kobject_release, parent 0000000096ea0bb1 (delayed 500)
> Feb 27 19:00:43 pc-mtodorov kernel: kobject: 'holders' (00000000ef926144): kobject_release, parent 0000000096ea0bb1 (delayed 1000)
> Feb 27 19:00:43 pc-mtodorov kernel: kobject: 'notes' (000000000c2f27e4): kobject_release, parent 0000000096ea0bb1 (delayed 500)
> Feb 27 19:00:47 pc-mtodorov kernel: kobject: 'gpio_sim' (0000000096ea0bb1): kobject_release, parent 0000000093357d30 (delayed 250)
> 
> dmesg is more extensive on the events:
> 
> [ 4819.240904] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_add_internal: parent: 'module', set: 'module'
> [ 4819.240925] kobject: 'holders' (00000000ef926144): kobject_add_internal: parent: 'gpio_sim', set: '<NULL>'
> [ 4819.241067] kobject: 'notes' (000000000c2f27e4): kobject_add_internal: parent: 'gpio_sim', set: '<NULL>'
> [ 4819.241106] kobject: 'gpio-sim' (000000005b8d0726): kobject_add_internal: parent: 'drivers', set: 'drivers'
> [ 4819.241134] kobject: 'drivers' (00000000bca28211): kobject_add_internal: parent: 'gpio_sim', set: '<NULL>'
> [ 4819.241148] kobject: 'gpio-sim' (000000005b8d0726): kobject_uevent_env
> [ 4819.241155] kobject: 'gpio-sim' (000000005b8d0726): fill_kobj_path: path = '/bus/platform/drivers/gpio-sim'
> [ 4819.241210] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_uevent_env
> [ 4819.241215] kobject: 'gpio_sim' (0000000096ea0bb1): fill_kobj_path: path = '/module/gpio_sim'
> [ 4819.257117] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.257172] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_uevent_env
> [ 4819.257177] kobject: 'gpio-sim.0' (00000000ca4e28ab): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.257297] kobject: 'gpiochip0' (000000007063b679): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.257484] kobject: 'gpiochip0' (000000007063b679): kobject_uevent_env
> [ 4819.257495] kobject: 'gpiochip0' (000000007063b679): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip0'
> [ 4819.257533] kobject: 'gpiochip0' (000000007063b679): kobject_uevent_env
> [ 4819.257545] kobject: 'gpiochip0' (000000007063b679): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip0'
> [ 4819.257571] kobject: 'gpio' (0000000065b01c31): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.257577] kobject: 'gpiochip512' (000000008b9638a5): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.257629] kobject: 'gpiochip512' (000000008b9638a5): kobject_uevent_env
> [ 4819.257634] kobject: 'gpiochip512' (000000008b9638a5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip512'
> [ 4819.257687] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_uevent_env
> [ 4819.257693] kobject: 'gpio-sim.0' (00000000ca4e28ab): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.275191] kobject: 'gpiochip512' (000000008b9638a5): kobject_uevent_env
> [ 4819.275202] kobject: 'gpiochip512' (000000008b9638a5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip512'
> [ 4819.275224] kobject: 'gpio' (0000000065b01c31): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.275227] kobject: 'gpiochip512' (000000008b9638a5): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.275329] kobject: 'gpiochip0' (000000007063b679): kobject_uevent_env
> [ 4819.275337] kobject: 'gpiochip0' (000000007063b679): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip0'
> [ 4819.275358] kobject: 'gpiochip0' (000000007063b679): kobject_uevent_env
> [ 4819.275363] kobject: 'gpiochip0' (000000007063b679): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip0'
> [ 4819.275406] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_uevent_env
> [ 4819.275415] kobject: 'gpio-sim.0' (00000000ca4e28ab): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.275432] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_uevent_env
> [ 4819.275437] kobject: 'gpio-sim.0' (00000000ca4e28ab): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.275447] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.303376] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.303430] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_uevent_env
> [ 4819.303435] kobject: 'gpio-sim.0' (000000007cf5eda9): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.303541] kobject: 'gpiochip1' (00000000c6873be9): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.303679] kobject: 'gpiochip1' (00000000c6873be9): kobject_uevent_env
> [ 4819.303689] kobject: 'gpiochip1' (00000000c6873be9): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip1'
> [ 4819.303724] kobject: 'gpiochip1' (00000000c6873be9): kobject_uevent_env
> [ 4819.303729] kobject: 'gpiochip1' (00000000c6873be9): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip1'
> [ 4819.303752] kobject: 'gpio' (000000007e927b76): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.303756] kobject: 'gpiochip513' (00000000307a0461): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.303800] kobject: 'gpiochip513' (00000000307a0461): kobject_uevent_env
> [ 4819.303805] kobject: 'gpiochip513' (00000000307a0461): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip513'
> [ 4819.303852] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_uevent_env
> [ 4819.303858] kobject: 'gpio-sim.0' (000000007cf5eda9): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.321116] kobject: 'gpiochip513' (00000000307a0461): kobject_uevent_env
> [ 4819.321128] kobject: 'gpiochip513' (00000000307a0461): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip513'
> [ 4819.321155] kobject: 'gpio' (000000007e927b76): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.321160] kobject: 'gpiochip513' (00000000307a0461): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.321268] kobject: 'gpiochip1' (00000000c6873be9): kobject_uevent_env
> [ 4819.321278] kobject: 'gpiochip1' (00000000c6873be9): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip1'
> [ 4819.321299] kobject: 'gpiochip1' (00000000c6873be9): kobject_uevent_env
> [ 4819.321304] kobject: 'gpiochip1' (00000000c6873be9): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip1'
> [ 4819.321335] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_uevent_env
> [ 4819.321343] kobject: 'gpio-sim.0' (000000007cf5eda9): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.321362] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_uevent_env
> [ 4819.321368] kobject: 'gpio-sim.0' (000000007cf5eda9): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.321378] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.327855] kobject: 'gpio-sim.0' (00000000401b009a): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.327906] kobject: 'gpio-sim.0' (00000000401b009a): kobject_uevent_env
> [ 4819.327911] kobject: 'gpio-sim.0' (00000000401b009a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.328025] kobject: 'gpiochip2' (0000000034808fa5): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.328130] kobject: 'gpiochip2' (0000000034808fa5): kobject_uevent_env
> [ 4819.328137] kobject: 'gpiochip2' (0000000034808fa5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip2'
> [ 4819.328221] kobject: 'gpiochip2' (0000000034808fa5): kobject_uevent_env
> [ 4819.328228] kobject: 'gpiochip2' (0000000034808fa5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip2'
> [ 4819.328250] kobject: 'gpio' (000000008afdcce8): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.328255] kobject: 'gpiochip514' (000000008e860d8b): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.328303] kobject: 'gpiochip514' (000000008e860d8b): kobject_uevent_env
> [ 4819.328309] kobject: 'gpiochip514' (000000008e860d8b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip514'
> [ 4819.328354] kobject: 'gpio-sim.0' (00000000401b009a): kobject_uevent_env
> [ 4819.328360] kobject: 'gpio-sim.0' (00000000401b009a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.347557] kobject: 'gpiochip514' (000000008e860d8b): kobject_uevent_env
> [ 4819.347567] kobject: 'gpiochip514' (000000008e860d8b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip514'
> [ 4819.347589] kobject: 'gpio' (000000008afdcce8): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.347593] kobject: 'gpiochip514' (000000008e860d8b): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.347703] kobject: 'gpiochip2' (0000000034808fa5): kobject_uevent_env
> [ 4819.347711] kobject: 'gpiochip2' (0000000034808fa5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip2'
> [ 4819.347731] kobject: 'gpiochip2' (0000000034808fa5): kobject_uevent_env
> [ 4819.347736] kobject: 'gpiochip2' (0000000034808fa5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip2'
> [ 4819.347774] kobject: 'gpio-sim.0' (00000000401b009a): kobject_uevent_env
> [ 4819.347782] kobject: 'gpio-sim.0' (00000000401b009a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.347800] kobject: 'gpio-sim.0' (00000000401b009a): kobject_uevent_env
> [ 4819.347806] kobject: 'gpio-sim.0' (00000000401b009a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.347816] kobject: 'gpio-sim.0' (00000000401b009a): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.355214] kobject: 'gpio-sim.0' (00000000b204b566): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.355265] kobject: 'gpio-sim.0' (00000000b204b566): kobject_uevent_env
> [ 4819.355270] kobject: 'gpio-sim.0' (00000000b204b566): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.355364] kobject: 'gpiochip3' (00000000f89849bd): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.355495] kobject: 'gpiochip3' (00000000f89849bd): kobject_uevent_env
> [ 4819.355505] kobject: 'gpiochip3' (00000000f89849bd): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip3'
> [ 4819.355537] kobject: 'gpiochip3' (00000000f89849bd): kobject_uevent_env
> [ 4819.355543] kobject: 'gpiochip3' (00000000f89849bd): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip3'
> [ 4819.355564] kobject: 'gpio' (00000000a1399cd0): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.355568] kobject: 'gpiochip515' (000000002b851bb5): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.355608] kobject: 'gpiochip515' (000000002b851bb5): kobject_uevent_env
> [ 4819.355614] kobject: 'gpiochip515' (000000002b851bb5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip515'
> [ 4819.355954] kobject: 'gpio-sim.0' (00000000b204b566): kobject_uevent_env
> [ 4819.355961] kobject: 'gpio-sim.0' (00000000b204b566): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.375898] kobject: 'gpiochip515' (000000002b851bb5): kobject_uevent_env
> [ 4819.375908] kobject: 'gpiochip515' (000000002b851bb5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip515'
> [ 4819.375930] kobject: 'gpio' (00000000a1399cd0): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.375932] kobject: 'gpiochip515' (000000002b851bb5): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.375998] kobject: 'gpiochip3' (00000000f89849bd): kobject_uevent_env
> [ 4819.376004] kobject: 'gpiochip3' (00000000f89849bd): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip3'
> [ 4819.376018] kobject: 'gpiochip3' (00000000f89849bd): kobject_uevent_env
> [ 4819.376022] kobject: 'gpiochip3' (00000000f89849bd): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip3'
> [ 4819.376048] kobject: 'gpio-sim.0' (00000000b204b566): kobject_uevent_env
> [ 4819.376055] kobject: 'gpio-sim.0' (00000000b204b566): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.376069] kobject: 'gpio-sim.0' (00000000b204b566): kobject_uevent_env
> [ 4819.376074] kobject: 'gpio-sim.0' (00000000b204b566): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.376083] kobject: 'gpio-sim.0' (00000000b204b566): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.382519] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.382577] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_uevent_env
> [ 4819.382584] kobject: 'gpio-sim.0' (00000000b9ef5a28): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.382684] kobject: 'gpiochip4' (00000000e06680f5): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.382826] kobject: 'gpiochip4' (00000000e06680f5): kobject_uevent_env
> [ 4819.382838] kobject: 'gpiochip4' (00000000e06680f5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip4'
> [ 4819.382874] kobject: 'gpiochip4' (00000000e06680f5): kobject_uevent_env
> [ 4819.382880] kobject: 'gpiochip4' (00000000e06680f5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip4'
> [ 4819.382904] kobject: 'gpio' (00000000babdf5db): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.382909] kobject: 'gpiochip531' (00000000ad4538e8): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.382952] kobject: 'gpiochip531' (00000000ad4538e8): kobject_uevent_env
> [ 4819.382958] kobject: 'gpiochip531' (00000000ad4538e8): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip531'
> [ 4819.383005] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_uevent_env
> [ 4819.383010] kobject: 'gpio-sim.0' (00000000b9ef5a28): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.403312] kobject: 'gpiochip531' (00000000ad4538e8): kobject_uevent_env
> [ 4819.403323] kobject: 'gpiochip531' (00000000ad4538e8): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip531'
> [ 4819.403343] kobject: 'gpio' (00000000babdf5db): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.403346] kobject: 'gpiochip531' (00000000ad4538e8): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.403445] kobject: 'gpiochip4' (00000000e06680f5): kobject_uevent_env
> [ 4819.403454] kobject: 'gpiochip4' (00000000e06680f5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip4'
> [ 4819.403473] kobject: 'gpiochip4' (00000000e06680f5): kobject_uevent_env
> [ 4819.403477] kobject: 'gpiochip4' (00000000e06680f5): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip4'
> [ 4819.403514] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_uevent_env
> [ 4819.403521] kobject: 'gpio-sim.0' (00000000b9ef5a28): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.403537] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_uevent_env
> [ 4819.403543] kobject: 'gpio-sim.0' (00000000b9ef5a28): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.403553] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.409746] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.409799] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_uevent_env
> [ 4819.409804] kobject: 'gpio-sim.0' (0000000034300a6b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.409899] kobject: 'gpiochip5' (000000004ef2dca6): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.410038] kobject: 'gpiochip5' (000000004ef2dca6): kobject_uevent_env
> [ 4819.410048] kobject: 'gpiochip5' (000000004ef2dca6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip5'
> [ 4819.410081] kobject: 'gpiochip5' (000000004ef2dca6): kobject_uevent_env
> [ 4819.410087] kobject: 'gpiochip5' (000000004ef2dca6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip5'
> [ 4819.410110] kobject: 'gpio' (000000008b98f863): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.410114] kobject: 'gpiochip532' (00000000ac07803f): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.410154] kobject: 'gpiochip532' (00000000ac07803f): kobject_uevent_env
> [ 4819.410159] kobject: 'gpiochip532' (00000000ac07803f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip532'
> [ 4819.410202] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_uevent_env
> [ 4819.410207] kobject: 'gpio-sim.0' (0000000034300a6b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.427858] kobject: 'gpiochip532' (00000000ac07803f): kobject_uevent_env
> [ 4819.427870] kobject: 'gpiochip532' (00000000ac07803f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip532'
> [ 4819.427891] kobject: 'gpio' (000000008b98f863): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.427895] kobject: 'gpiochip532' (00000000ac07803f): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.427970] kobject: 'gpiochip5' (000000004ef2dca6): kobject_uevent_env
> [ 4819.427976] kobject: 'gpiochip5' (000000004ef2dca6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip5'
> [ 4819.427994] kobject: 'gpiochip5' (000000004ef2dca6): kobject_uevent_env
> [ 4819.427999] kobject: 'gpiochip5' (000000004ef2dca6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip5'
> [ 4819.428044] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_uevent_env
> [ 4819.428053] kobject: 'gpio-sim.0' (0000000034300a6b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.428071] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_uevent_env
> [ 4819.428077] kobject: 'gpio-sim.0' (0000000034300a6b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.428088] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.440540] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.440596] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_uevent_env
> [ 4819.440601] kobject: 'gpio-sim.0' (00000000cdc367f1): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.440694] kobject: 'gpiochip6' (00000000a22546a6): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.440824] kobject: 'gpiochip6' (00000000a22546a6): kobject_uevent_env
> [ 4819.440834] kobject: 'gpiochip6' (00000000a22546a6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip6'
> [ 4819.440869] kobject: 'gpiochip6' (00000000a22546a6): kobject_uevent_env
> [ 4819.440875] kobject: 'gpiochip6' (00000000a22546a6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip6'
> [ 4819.440898] kobject: 'gpio' (00000000dedc22f2): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.440903] kobject: 'gpiochip533' (000000003541481f): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.440943] kobject: 'gpiochip533' (000000003541481f): kobject_uevent_env
> [ 4819.440948] kobject: 'gpiochip533' (000000003541481f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip533'
> [ 4819.441305] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_uevent_env
> [ 4819.441311] kobject: 'gpio-sim.0' (00000000cdc367f1): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.470191] kobject: 'gpiochip533' (000000003541481f): kobject_uevent_env
> [ 4819.470202] kobject: 'gpiochip533' (000000003541481f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip533'
> [ 4819.470226] kobject: 'gpio' (00000000dedc22f2): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.470230] kobject: 'gpiochip533' (000000003541481f): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.470337] kobject: 'gpiochip6' (00000000a22546a6): kobject_uevent_env
> [ 4819.470345] kobject: 'gpiochip6' (00000000a22546a6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip6'
> [ 4819.470364] kobject: 'gpiochip6' (00000000a22546a6): kobject_uevent_env
> [ 4819.470369] kobject: 'gpiochip6' (00000000a22546a6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip6'
> [ 4819.470401] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_uevent_env
> [ 4819.470408] kobject: 'gpio-sim.0' (00000000cdc367f1): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.470425] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_uevent_env
> [ 4819.470431] kobject: 'gpio-sim.0' (00000000cdc367f1): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.470441] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.479607] kobject: 'gpio-sim.0' (00000000bb358104): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.479661] kobject: 'gpio-sim.0' (00000000bb358104): kobject_uevent_env
> [ 4819.479667] kobject: 'gpio-sim.0' (00000000bb358104): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.479757] kobject: 'gpiochip7' (000000006b8d9c99): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.479878] kobject: 'gpiochip7' (000000006b8d9c99): kobject_uevent_env
> [ 4819.479885] kobject: 'gpiochip7' (000000006b8d9c99): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip7'
> [ 4819.479914] kobject: 'gpiochip7' (000000006b8d9c99): kobject_uevent_env
> [ 4819.479919] kobject: 'gpiochip7' (000000006b8d9c99): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip7'
> [ 4819.479939] kobject: 'gpio' (00000000e467cb12): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.479943] kobject: 'gpiochip549' (0000000014379c6d): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.479990] kobject: 'gpiochip549' (0000000014379c6d): kobject_uevent_env
> [ 4819.479995] kobject: 'gpiochip549' (0000000014379c6d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip549'
> [ 4819.480055] kobject: 'gpio-sim.0' (00000000bb358104): kobject_uevent_env
> [ 4819.480060] kobject: 'gpio-sim.0' (00000000bb358104): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.506928] kobject: 'gpiochip549' (0000000014379c6d): kobject_uevent_env
> [ 4819.506940] kobject: 'gpiochip549' (0000000014379c6d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip549'
> [ 4819.506961] kobject: 'gpio' (00000000e467cb12): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.506965] kobject: 'gpiochip549' (0000000014379c6d): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.507073] kobject: 'gpiochip7' (000000006b8d9c99): kobject_uevent_env
> [ 4819.507083] kobject: 'gpiochip7' (000000006b8d9c99): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip7'
> [ 4819.507104] kobject: 'gpiochip7' (000000006b8d9c99): kobject_uevent_env
> [ 4819.507109] kobject: 'gpiochip7' (000000006b8d9c99): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip7'
> [ 4819.507137] kobject: 'gpio-sim.0' (00000000bb358104): kobject_uevent_env
> [ 4819.507145] kobject: 'gpio-sim.0' (00000000bb358104): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.507162] kobject: 'gpio-sim.0' (00000000bb358104): kobject_uevent_env
> [ 4819.507167] kobject: 'gpio-sim.0' (00000000bb358104): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.507178] kobject: 'gpio-sim.0' (00000000bb358104): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.538632] kobject: 'gpio-sim.0' (00000000461517ae): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.538690] kobject: 'gpio-sim.0' (00000000461517ae): kobject_uevent_env
> [ 4819.538695] kobject: 'gpio-sim.0' (00000000461517ae): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.538804] kobject: 'gpiochip8' (00000000cb0b3463): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.538943] kobject: 'gpiochip8' (00000000cb0b3463): kobject_uevent_env
> [ 4819.538953] kobject: 'gpiochip8' (00000000cb0b3463): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip8'
> [ 4819.538990] kobject: 'gpiochip8' (00000000cb0b3463): kobject_uevent_env
> [ 4819.538996] kobject: 'gpiochip8' (00000000cb0b3463): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip8'
> [ 4819.539020] kobject: 'gpio' (0000000016f05b5a): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.539025] kobject: 'gpiochip551' (00000000a55e630b): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.539066] kobject: 'gpiochip551' (00000000a55e630b): kobject_uevent_env
> [ 4819.539072] kobject: 'gpiochip551' (00000000a55e630b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip551'
> [ 4819.539118] kobject: 'gpio-sim.0' (00000000461517ae): kobject_uevent_env
> [ 4819.539124] kobject: 'gpio-sim.0' (00000000461517ae): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.545644] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.545706] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_uevent_env
> [ 4819.545712] kobject: 'gpio-sim.1' (0000000018f833bf): fill_kobj_path: path = '/devices/platform/gpio-sim.1'
> [ 4819.545808] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_add_internal: parent: 'gpio-sim.1', set: 'devices'
> [ 4819.545937] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_uevent_env
> [ 4819.545948] kobject: 'gpiochip9' (00000000bdaa0a47): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpiochip9'
> [ 4819.545981] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_uevent_env
> [ 4819.545986] kobject: 'gpiochip9' (00000000bdaa0a47): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpiochip9'
> [ 4819.546010] kobject: 'gpio' (00000000176df109): kobject_add_internal: parent: 'gpio-sim.1', set: '(null)'
> [ 4819.546014] kobject: 'gpiochip552' (000000001750e50f): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.546056] kobject: 'gpiochip552' (000000001750e50f): kobject_uevent_env
> [ 4819.546061] kobject: 'gpiochip552' (000000001750e50f): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpio/gpiochip552'
> [ 4819.546105] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_uevent_env
> [ 4819.546112] kobject: 'gpio-sim.1' (0000000018f833bf): fill_kobj_path: path = '/devices/platform/gpio-sim.1'
> [ 4819.553126] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.553181] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_uevent_env
> [ 4819.553188] kobject: 'gpio-sim.2' (00000000bbfd5238): fill_kobj_path: path = '/devices/platform/gpio-sim.2'
> [ 4819.553297] kobject: 'gpiochip10' (00000000e3becc55): kobject_add_internal: parent: 'gpio-sim.2', set: 'devices'
> [ 4819.553398] kobject: 'gpiochip10' (00000000e3becc55): kobject_uevent_env
> [ 4819.553404] kobject: 'gpiochip10' (00000000e3becc55): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpiochip10'
> [ 4819.553432] kobject: 'gpiochip10' (00000000e3becc55): kobject_uevent_env
> [ 4819.553437] kobject: 'gpiochip10' (00000000e3becc55): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpiochip10'
> [ 4819.553458] kobject: 'gpio' (00000000886e1a77): kobject_add_internal: parent: 'gpio-sim.2', set: '(null)'
> [ 4819.553463] kobject: 'gpiochip553' (0000000010cfe833): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.553504] kobject: 'gpiochip553' (0000000010cfe833): kobject_uevent_env
> [ 4819.553512] kobject: 'gpiochip553' (0000000010cfe833): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpio/gpiochip553'
> [ 4819.553561] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_uevent_env
> [ 4819.553569] kobject: 'gpio-sim.2' (00000000bbfd5238): fill_kobj_path: path = '/devices/platform/gpio-sim.2'
> [ 4819.568521] kobject: 'gpiochip551' (00000000a55e630b): kobject_uevent_env
> [ 4819.568536] kobject: 'gpiochip551' (00000000a55e630b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip551'
> [ 4819.568570] kobject: 'gpio' (0000000016f05b5a): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.568574] kobject: 'gpiochip551' (00000000a55e630b): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.568864] kobject: 'gpiochip8' (00000000cb0b3463): kobject_uevent_env
> [ 4819.568871] kobject: 'gpiochip8' (00000000cb0b3463): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip8'
> [ 4819.568890] kobject: 'gpiochip8' (00000000cb0b3463): kobject_uevent_env
> [ 4819.568895] kobject: 'gpiochip8' (00000000cb0b3463): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip8'
> [ 4819.568932] kobject: 'gpio-sim.0' (00000000461517ae): kobject_uevent_env
> [ 4819.568939] kobject: 'gpio-sim.0' (00000000461517ae): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.568954] kobject: 'gpio-sim.0' (00000000461517ae): kobject_uevent_env
> [ 4819.568960] kobject: 'gpio-sim.0' (00000000461517ae): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.568970] kobject: 'gpio-sim.0' (00000000461517ae): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.583881] kobject: 'gpiochip552' (000000001750e50f): kobject_uevent_env
> [ 4819.583892] kobject: 'gpiochip552' (000000001750e50f): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpio/gpiochip552'
> [ 4819.583914] kobject: 'gpio' (00000000176df109): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.583918] kobject: 'gpiochip552' (000000001750e50f): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.583988] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_uevent_env
> [ 4819.583994] kobject: 'gpiochip9' (00000000bdaa0a47): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpiochip9'
> [ 4819.584007] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_uevent_env
> [ 4819.584013] kobject: 'gpiochip9' (00000000bdaa0a47): fill_kobj_path: path = '/devices/platform/gpio-sim.1/gpiochip9'
> [ 4819.584048] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_uevent_env
> [ 4819.584056] kobject: 'gpio-sim.1' (0000000018f833bf): fill_kobj_path: path = '/devices/platform/gpio-sim.1'
> [ 4819.584072] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_uevent_env
> [ 4819.584077] kobject: 'gpio-sim.1' (0000000018f833bf): fill_kobj_path: path = '/devices/platform/gpio-sim.1'
> [ 4819.584087] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.599281] kobject: 'gpiochip553' (0000000010cfe833): kobject_uevent_env
> [ 4819.599292] kobject: 'gpiochip553' (0000000010cfe833): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpio/gpiochip553'
> [ 4819.599316] kobject: 'gpio' (00000000886e1a77): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.599319] kobject: 'gpiochip553' (0000000010cfe833): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.599418] kobject: 'gpiochip10' (00000000e3becc55): kobject_uevent_env
> [ 4819.599426] kobject: 'gpiochip10' (00000000e3becc55): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpiochip10'
> [ 4819.599441] kobject: 'gpiochip10' (00000000e3becc55): kobject_uevent_env
> [ 4819.599446] kobject: 'gpiochip10' (00000000e3becc55): fill_kobj_path: path = '/devices/platform/gpio-sim.2/gpiochip10'
> [ 4819.599479] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_uevent_env
> [ 4819.599488] kobject: 'gpio-sim.2' (00000000bbfd5238): fill_kobj_path: path = '/devices/platform/gpio-sim.2'
> [ 4819.599504] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_uevent_env
> [ 4819.599509] kobject: 'gpio-sim.2' (00000000bbfd5238): fill_kobj_path: path = '/devices/platform/gpio-sim.2'
> [ 4819.599521] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.606440] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.606495] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_uevent_env
> [ 4819.606501] kobject: 'gpio-sim.0' (00000000e8c2899c): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.606609] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.606742] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_uevent_env
> [ 4819.606753] kobject: 'gpiochip11' (00000000b39a3c5f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip11'
> [ 4819.606789] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_uevent_env
> [ 4819.606795] kobject: 'gpiochip11' (00000000b39a3c5f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip11'
> [ 4819.606817] kobject: 'gpio' (000000002835f4a4): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.606821] kobject: 'gpiochip554' (00000000e0038afb): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.606864] kobject: 'gpiochip554' (00000000e0038afb): kobject_uevent_env
> [ 4819.606869] kobject: 'gpiochip554' (00000000e0038afb): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip554'
> [ 4819.606914] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_uevent_env
> [ 4819.606919] kobject: 'gpio-sim.0' (00000000e8c2899c): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.622045] kobject: 'gpiochip554' (00000000e0038afb): kobject_uevent_env
> [ 4819.622055] kobject: 'gpiochip554' (00000000e0038afb): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip554'
> [ 4819.622076] kobject: 'gpio' (000000002835f4a4): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.622079] kobject: 'gpiochip554' (00000000e0038afb): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.622179] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_uevent_env
> [ 4819.622187] kobject: 'gpiochip11' (00000000b39a3c5f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip11'
> [ 4819.622205] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_uevent_env
> [ 4819.622210] kobject: 'gpiochip11' (00000000b39a3c5f): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip11'
> [ 4819.622243] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_uevent_env
> [ 4819.622252] kobject: 'gpio-sim.0' (00000000e8c2899c): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.622268] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_uevent_env
> [ 4819.622274] kobject: 'gpio-sim.0' (00000000e8c2899c): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.622283] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.628405] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.628464] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_uevent_env
> [ 4819.628471] kobject: 'gpio-sim.0' (000000008ef7f514): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.628588] kobject: 'gpiochip12' (0000000051b24fd2): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.628727] kobject: 'gpiochip12' (0000000051b24fd2): kobject_uevent_env
> [ 4819.628737] kobject: 'gpiochip12' (0000000051b24fd2): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip12'
> [ 4819.628772] kobject: 'gpiochip12' (0000000051b24fd2): kobject_uevent_env
> [ 4819.628777] kobject: 'gpiochip12' (0000000051b24fd2): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip12'
> [ 4819.628799] kobject: 'gpio' (00000000d962e90a): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.628804] kobject: 'gpiochip555' (00000000f5bbd198): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.628845] kobject: 'gpiochip555' (00000000f5bbd198): kobject_uevent_env
> [ 4819.628850] kobject: 'gpiochip555' (00000000f5bbd198): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip555'
> [ 4819.628893] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_uevent_env
> [ 4819.628899] kobject: 'gpio-sim.0' (000000008ef7f514): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.646727] kobject: 'gpiochip555' (00000000f5bbd198): kobject_uevent_env
> [ 4819.646740] kobject: 'gpiochip555' (00000000f5bbd198): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip555'
> [ 4819.646764] kobject: 'gpio' (00000000d962e90a): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.646768] kobject: 'gpiochip555' (00000000f5bbd198): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.646880] kobject: 'gpiochip12' (0000000051b24fd2): kobject_uevent_env
> [ 4819.646889] kobject: 'gpiochip12' (0000000051b24fd2): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip12'
> [ 4819.646912] kobject: 'gpiochip12' (0000000051b24fd2): kobject_uevent_env
> [ 4819.646918] kobject: 'gpiochip12' (0000000051b24fd2): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip12'
> [ 4819.646962] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_uevent_env
> [ 4819.646971] kobject: 'gpio-sim.0' (000000008ef7f514): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.646991] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_uevent_env
> [ 4819.646997] kobject: 'gpio-sim.0' (000000008ef7f514): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.647009] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.654427] kobject: 'gpio-sim.0' (000000005418b2af): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.654482] kobject: 'gpio-sim.0' (000000005418b2af): kobject_uevent_env
> [ 4819.654488] kobject: 'gpio-sim.0' (000000005418b2af): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.654536] gpio-sim: probe of gpio-sim.0 failed with error -34
> [ 4819.654556] kobject: 'gpio-sim.0' (000000005418b2af): kobject_uevent_env
> [ 4819.654562] kobject: 'gpio-sim.0' (000000005418b2af): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.654576] kobject: 'gpio-sim.0' (000000005418b2af): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.717310] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.717365] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_uevent_env
> [ 4819.717371] kobject: 'gpio-sim.0' (00000000cd797c7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.717473] gpio-560 (?): hogged as input
> [ 4819.717479] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.717621] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_uevent_env
> [ 4819.717630] kobject: 'gpiochip13' (00000000dc27f1aa): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip13'
> [ 4819.717669] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_uevent_env
> [ 4819.717676] kobject: 'gpiochip13' (00000000dc27f1aa): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip13'
> [ 4819.717698] kobject: 'gpio' (000000006cce49d7): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.717703] kobject: 'gpiochip556' (00000000d2b04f32): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.717753] kobject: 'gpiochip556' (00000000d2b04f32): kobject_uevent_env
> [ 4819.717760] kobject: 'gpiochip556' (00000000d2b04f32): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip556'
> [ 4819.717948] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_uevent_env
> [ 4819.717954] kobject: 'gpio-sim.0' (00000000cd797c7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.740722] kobject: 'gpiochip556' (00000000d2b04f32): kobject_uevent_env
> [ 4819.740733] kobject: 'gpiochip556' (00000000d2b04f32): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip556'
> [ 4819.740753] kobject: 'gpio' (000000006cce49d7): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.740757] kobject: 'gpiochip556' (00000000d2b04f32): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.740863] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_uevent_env
> [ 4819.740871] kobject: 'gpiochip13' (00000000dc27f1aa): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip13'
> [ 4819.740890] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_uevent_env
> [ 4819.740896] kobject: 'gpiochip13' (00000000dc27f1aa): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip13'
> [ 4819.740928] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_uevent_env
> [ 4819.740936] kobject: 'gpio-sim.0' (00000000cd797c7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.740951] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_uevent_env
> [ 4819.740958] kobject: 'gpio-sim.0' (00000000cd797c7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.740970] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.747033] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.747082] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_uevent_env
> [ 4819.747087] kobject: 'gpio-sim.0' (000000006053a4bf): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.747182] kobject: 'gpiochip14' (0000000092a079b6): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.747311] kobject: 'gpiochip14' (0000000092a079b6): kobject_uevent_env
> [ 4819.747321] kobject: 'gpiochip14' (0000000092a079b6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip14'
> [ 4819.747354] kobject: 'gpiochip14' (0000000092a079b6): kobject_uevent_env
> [ 4819.747359] kobject: 'gpiochip14' (0000000092a079b6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip14'
> [ 4819.747381] kobject: 'gpio' (000000007164bff6): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.747386] kobject: 'gpiochip564' (00000000ee87da7b): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.747426] kobject: 'gpiochip564' (00000000ee87da7b): kobject_uevent_env
> [ 4819.747431] kobject: 'gpiochip564' (00000000ee87da7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip564'
> [ 4819.747622] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_uevent_env
> [ 4819.747629] kobject: 'gpio-sim.0' (000000006053a4bf): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.782537] kobject: 'gpiochip564' (00000000ee87da7b): kobject_uevent_env
> [ 4819.782547] kobject: 'gpiochip564' (00000000ee87da7b): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip564'
> [ 4819.782567] kobject: 'gpio' (000000007164bff6): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.782571] kobject: 'gpiochip564' (00000000ee87da7b): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.782653] kobject: 'gpiochip14' (0000000092a079b6): kobject_uevent_env
> [ 4819.782662] kobject: 'gpiochip14' (0000000092a079b6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip14'
> [ 4819.782680] kobject: 'gpiochip14' (0000000092a079b6): kobject_uevent_env
> [ 4819.782685] kobject: 'gpiochip14' (0000000092a079b6): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip14'
> [ 4819.782719] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_uevent_env
> [ 4819.782729] kobject: 'gpio-sim.0' (000000006053a4bf): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.782745] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_uevent_env
> [ 4819.782750] kobject: 'gpio-sim.0' (000000006053a4bf): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.782760] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.789540] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.789591] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_uevent_env
> [ 4819.789597] kobject: 'gpio-sim.0' (00000000c56fc456): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.789698] kobject: 'gpiochip15' (00000000b0535d8d): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.789829] kobject: 'gpiochip15' (00000000b0535d8d): kobject_uevent_env
> [ 4819.789839] kobject: 'gpiochip15' (00000000b0535d8d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip15'
> [ 4819.789873] kobject: 'gpiochip15' (00000000b0535d8d): kobject_uevent_env
> [ 4819.789880] kobject: 'gpiochip15' (00000000b0535d8d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip15'
> [ 4819.789902] kobject: 'gpio' (0000000012ac3b4a): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.789907] kobject: 'gpiochip572' (00000000178509ff): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.789957] kobject: 'gpiochip572' (00000000178509ff): kobject_uevent_env
> [ 4819.789963] kobject: 'gpiochip572' (00000000178509ff): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip572'
> [ 4819.790172] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_uevent_env
> [ 4819.790179] kobject: 'gpio-sim.0' (00000000c56fc456): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.820474] kobject: 'gpiochip572' (00000000178509ff): kobject_uevent_env
> [ 4819.820489] kobject: 'gpiochip572' (00000000178509ff): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip572'
> [ 4819.820515] kobject: 'gpio' (0000000012ac3b4a): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.820519] kobject: 'gpiochip572' (00000000178509ff): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4819.820629] kobject: 'gpiochip15' (00000000b0535d8d): kobject_uevent_env
> [ 4819.820640] kobject: 'gpiochip15' (00000000b0535d8d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip15'
> [ 4819.820664] kobject: 'gpiochip15' (00000000b0535d8d): kobject_uevent_env
> [ 4819.820669] kobject: 'gpiochip15' (00000000b0535d8d): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip15'
> [ 4819.820715] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_uevent_env
> [ 4819.820724] kobject: 'gpio-sim.0' (00000000c56fc456): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.820745] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_uevent_env
> [ 4819.820751] kobject: 'gpio-sim.0' (00000000c56fc456): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.820761] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.827333] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.827384] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_uevent_env
> [ 4819.827390] kobject: 'gpio-sim.0' (000000000471ebbe): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.827489] kobject: 'gpiochip16' (000000002be607c1): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.827596] kobject: 'gpiochip16' (000000002be607c1): kobject_uevent_env
> [ 4819.827606] kobject: 'gpiochip16' (000000002be607c1): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip16'
> [ 4819.827647] kobject: 'gpiochip16' (000000002be607c1): kobject_uevent_env
> [ 4819.827652] kobject: 'gpiochip16' (000000002be607c1): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip16'
> [ 4819.827675] kobject: 'gpio' (000000000333f422): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.827679] kobject: 'gpiochip580' (00000000f6371a1e): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.827719] kobject: 'gpiochip580' (00000000f6371a1e): kobject_uevent_env
> [ 4819.827724] kobject: 'gpiochip580' (00000000f6371a1e): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip580'
> [ 4819.827920] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_uevent_env
> [ 4819.827927] kobject: 'gpio-sim.0' (000000000471ebbe): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.849122] kobject: 'gpiochip580' (00000000f6371a1e): kobject_uevent_env
> [ 4819.849136] kobject: 'gpiochip580' (00000000f6371a1e): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip580'
> [ 4819.849160] kobject: 'gpio' (000000000333f422): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.849163] kobject: 'gpiochip580' (00000000f6371a1e): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.849279] kobject: 'gpiochip16' (000000002be607c1): kobject_uevent_env
> [ 4819.849293] kobject: 'gpiochip16' (000000002be607c1): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip16'
> [ 4819.849317] kobject: 'gpiochip16' (000000002be607c1): kobject_uevent_env
> [ 4819.849323] kobject: 'gpiochip16' (000000002be607c1): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip16'
> [ 4819.849381] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_uevent_env
> [ 4819.849391] kobject: 'gpio-sim.0' (000000000471ebbe): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.849421] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_uevent_env
> [ 4819.849428] kobject: 'gpio-sim.0' (000000000471ebbe): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.849442] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.856384] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.856438] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_uevent_env
> [ 4819.856445] kobject: 'gpio-sim.0' (0000000048f1330d): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.856563] kobject: 'gpiochip17' (000000006ee06561): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.856712] kobject: 'gpiochip17' (000000006ee06561): kobject_uevent_env
> [ 4819.856724] kobject: 'gpiochip17' (000000006ee06561): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip17'
> [ 4819.856786] kobject: 'gpiochip17' (000000006ee06561): kobject_uevent_env
> [ 4819.856794] kobject: 'gpiochip17' (000000006ee06561): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip17'
> [ 4819.856821] kobject: 'gpio' (0000000005a238f5): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.856825] kobject: 'gpiochip588' (0000000075b76b85): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.856868] kobject: 'gpiochip588' (0000000075b76b85): kobject_uevent_env
> [ 4819.856874] kobject: 'gpiochip588' (0000000075b76b85): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip588'
> [ 4819.856922] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_uevent_env
> [ 4819.856928] kobject: 'gpio-sim.0' (0000000048f1330d): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.878720] kobject: 'gpiochip588' (0000000075b76b85): kobject_uevent_env
> [ 4819.878731] kobject: 'gpiochip588' (0000000075b76b85): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip588'
> [ 4819.878750] kobject: 'gpio' (0000000005a238f5): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4819.878755] kobject: 'gpiochip588' (0000000075b76b85): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4819.878864] kobject: 'gpiochip17' (000000006ee06561): kobject_uevent_env
> [ 4819.878872] kobject: 'gpiochip17' (000000006ee06561): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip17'
> [ 4819.878890] kobject: 'gpiochip17' (000000006ee06561): kobject_uevent_env
> [ 4819.878896] kobject: 'gpiochip17' (000000006ee06561): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip17'
> [ 4819.878928] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_uevent_env
> [ 4819.878936] kobject: 'gpio-sim.0' (0000000048f1330d): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.878950] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_uevent_env
> [ 4819.878954] kobject: 'gpio-sim.0' (0000000048f1330d): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.878964] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4819.885904] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4819.885967] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_uevent_env
> [ 4819.885973] kobject: 'gpio-sim.0' (00000000f462f78a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4819.886080] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4819.886214] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_uevent_env
> [ 4819.886224] kobject: 'gpiochip18' (00000000a8ca1f8c): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip18'
> [ 4819.886257] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_uevent_env
> [ 4819.886264] kobject: 'gpiochip18' (00000000a8ca1f8c): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip18'
> [ 4819.886289] kobject: 'gpio' (0000000064e73453): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4819.886293] kobject: 'gpiochip589' (000000007e1cf13a): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4819.886340] kobject: 'gpiochip589' (000000007e1cf13a): kobject_uevent_env
> [ 4819.886345] kobject: 'gpiochip589' (000000007e1cf13a): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip589'
> [ 4819.886554] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_uevent_env
> [ 4819.886560] kobject: 'gpio-sim.0' (00000000f462f78a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.013863] kobject: 'gpiochip589' (000000007e1cf13a): kobject_uevent_env
> [ 4820.013872] kobject: 'gpiochip589' (000000007e1cf13a): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip589'
> [ 4820.013894] kobject: 'gpio' (0000000064e73453): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4820.013897] kobject: 'gpiochip589' (000000007e1cf13a): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4820.013994] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_uevent_env
> [ 4820.014004] kobject: 'gpiochip18' (00000000a8ca1f8c): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip18'
> [ 4820.014022] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_uevent_env
> [ 4820.014027] kobject: 'gpiochip18' (00000000a8ca1f8c): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip18'
> [ 4820.014059] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_uevent_env
> [ 4820.014065] kobject: 'gpio-sim.0' (00000000f462f78a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.014082] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_uevent_env
> [ 4820.014087] kobject: 'gpio-sim.0' (00000000f462f78a): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.014098] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4820.020299] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_add_internal: parent: 'platform', set: 'devices'
> [ 4820.020347] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_uevent_env
> [ 4820.020352] kobject: 'gpio-sim.0' (00000000b1d6276b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.020447] kobject: 'gpiochip19' (000000008385ae47): kobject_add_internal: parent: 'gpio-sim.0', set: 'devices'
> [ 4820.020581] kobject: 'gpiochip19' (000000008385ae47): kobject_uevent_env
> [ 4820.020590] kobject: 'gpiochip19' (000000008385ae47): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip19'
> [ 4820.020622] kobject: 'gpiochip19' (000000008385ae47): kobject_uevent_env
> [ 4820.020627] kobject: 'gpiochip19' (000000008385ae47): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip19'
> [ 4820.020651] kobject: 'gpio' (000000001bd064f6): kobject_add_internal: parent: 'gpio-sim.0', set: '(null)'
> [ 4820.020655] kobject: 'gpiochip597' (00000000a32f70da): kobject_add_internal: parent: 'gpio', set: 'devices'
> [ 4820.020701] kobject: 'gpiochip597' (00000000a32f70da): kobject_uevent_env
> [ 4820.020707] kobject: 'gpiochip597' (00000000a32f70da): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip597'
> [ 4820.020890] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_uevent_env
> [ 4820.020896] kobject: 'gpio-sim.0' (00000000b1d6276b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.048138] kobject: 'gpiochip597' (00000000a32f70da): kobject_uevent_env
> [ 4820.048148] kobject: 'gpiochip597' (00000000a32f70da): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpio/gpiochip597'
> [ 4820.048175] kobject: 'gpio' (000000001bd064f6): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4820.048179] kobject: 'gpiochip597' (00000000a32f70da): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4820.048273] kobject: 'gpiochip19' (000000008385ae47): kobject_uevent_env
> [ 4820.048282] kobject: 'gpiochip19' (000000008385ae47): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip19'
> [ 4820.048307] kobject: 'gpiochip19' (000000008385ae47): kobject_uevent_env
> [ 4820.048313] kobject: 'gpiochip19' (000000008385ae47): fill_kobj_path: path = '/devices/platform/gpio-sim.0/gpiochip19'
> [ 4820.048356] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_uevent_env
> [ 4820.048364] kobject: 'gpio-sim.0' (00000000b1d6276b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.048385] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_uevent_env
> [ 4820.048391] kobject: 'gpio-sim.0' (00000000b1d6276b): fill_kobj_path: path = '/devices/platform/gpio-sim.0'
> [ 4820.048407] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4820.304376] kobject: 'gpiochip512' (000000008b9638a5): kobject_cleanup, parent 0000000000000000
> [ 4820.304378] kobject: 'gpiochip512' (000000008b9638a5): calling ktype release
> [ 4820.304384] kobject: 'gpiochip512': free name
> [ 4820.304387] kobject: 'gpio' (0000000065b01c31): kobject_cleanup, parent 0000000000000000
> [ 4820.304388] kobject: 'gpio' (0000000065b01c31): calling ktype release
> [ 4820.304391] kobject: 'gpio': free name
> [ 4820.400182] kobject: 'gpiochip3' (00000000f89849bd): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4820.436325] kobject: 'gpio' (00000000babdf5db): kobject_cleanup, parent 0000000000000000
> [ 4820.436331] kobject: 'gpio' (00000000babdf5db): calling ktype release
> [ 4820.436335] kobject: 'gpio': free name
> [ 4820.436344] kobject: 'gpio-sim.0' (0000000034300a6b): kobject_cleanup, parent 0000000000000000
> [ 4820.436348] kobject: 'gpio-sim.0' (0000000034300a6b): calling ktype release
> [ 4820.436355] kobject: 'gpio-sim.0': free name
> [ 4820.436357] kobject: 'gpio' (000000008b98f863): kobject_cleanup, parent 0000000000000000
> [ 4820.436359] kobject: 'gpio' (000000008b98f863): calling ktype release
> [ 4820.436363] kobject: 'gpio': free name
> [ 4820.496304] kobject: 'gpio-sim.0' (00000000cdc367f1): kobject_cleanup, parent 0000000000000000
> [ 4820.496306] kobject: 'gpio-sim.0' (00000000cdc367f1): calling ktype release
> [ 4820.496312] kobject: 'gpio-sim.0': free name
> [ 4820.528235] kobject: 'gpiochip549' (0000000014379c6d): kobject_cleanup, parent 0000000000000000
> [ 4820.528242] kobject: 'gpiochip549' (0000000014379c6d): calling ktype release
> [ 4820.528248] kobject: 'gpiochip549': free name
> [ 4820.596327] kobject: 'gpiochip551' (00000000a55e630b): kobject_cleanup, parent 0000000000000000
> [ 4820.596333] kobject: 'gpiochip551' (00000000a55e630b): calling ktype release
> [ 4820.596341] kobject: 'gpiochip551': free name
> [ 4820.624451] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4820.624455] kobject: 'gpio' (000000002835f4a4): kobject_cleanup, parent 0000000000000000
> [ 4820.624456] kobject: 'gpio' (000000002835f4a4): calling ktype release
> [ 4820.624461] kobject: 'gpio': free name
> [ 4820.656309] kobject: 'gpiochip12' (0000000051b24fd2): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4820.656313] kobject: 'gpiochip555' (00000000f5bbd198): kobject_cleanup, parent 0000000000000000
> [ 4820.656315] kobject: 'gpiochip555' (00000000f5bbd198): calling ktype release
> [ 4820.656321] kobject: 'gpiochip555': free name
> [ 4820.656324] kobject: 'gpio' (00000000d962e90a): kobject_cleanup, parent 0000000000000000
> [ 4820.656326] kobject: 'gpio' (00000000d962e90a): calling ktype release
> [ 4820.656329] kobject: 'gpio': free name
> [ 4820.752233] kobject: 'gpiochip556' (00000000d2b04f32): kobject_cleanup, parent 0000000000000000
> [ 4820.752240] kobject: 'gpiochip556' (00000000d2b04f32): calling ktype release
> [ 4820.752246] kobject: 'gpiochip556': free name
> [ 4820.788358] kobject: 'gpio-sim.0' (000000006053a4bf): kobject_cleanup, parent 0000000000000000
> [ 4820.788360] kobject: 'gpio-sim.0' (000000006053a4bf): calling ktype release
> [ 4820.788365] kobject: 'gpio-sim.0': free name
> [ 4820.788367] kobject: 'gpio' (000000007164bff6): kobject_cleanup, parent 0000000000000000
> [ 4820.788369] kobject: 'gpio' (000000007164bff6): calling ktype release
> [ 4820.788373] kobject: 'gpio': free name
> [ 4820.848443] kobject: 'gpio-sim.0' (00000000c56fc456): kobject_cleanup, parent 0000000000000000
> [ 4820.848449] kobject: 'gpio-sim.0' (00000000c56fc456): calling ktype release
> [ 4820.848457] kobject: 'gpio-sim.0': free name
> [ 4820.852177] kobject: 'gpio' (0000000012ac3b4a): kobject_cleanup, parent 0000000000000000
> [ 4820.852183] kobject: 'gpio' (0000000012ac3b4a): calling ktype release
> [ 4820.852187] kobject: 'gpio': free name
> [ 4820.880305] kobject: 'gpio' (000000000333f422): kobject_cleanup, parent 0000000000000000
> [ 4820.880326] kobject: 'gpio' (000000000333f422): calling ktype release
> [ 4820.880332] kobject: 'gpio': free name
> [ 4820.884286] kobject: 'gpio-sim.0' (0000000048f1330d): kobject_cleanup, parent 0000000000000000
> [ 4820.884288] kobject: 'gpio-sim.0' (0000000048f1330d): calling ktype release
> [ 4820.884293] kobject: 'gpio-sim.0': free name
> [ 4820.884296] kobject: 'gpio-sim.0' (000000000471ebbe): kobject_cleanup, parent 0000000000000000
> [ 4820.884298] kobject: 'gpio-sim.0' (000000000471ebbe): calling ktype release
> [ 4820.884304] kobject: 'gpio-sim.0': free name
> [ 4821.076363] kobject: 'gpio-sim.0' (00000000b1d6276b): kobject_cleanup, parent 0000000000000000
> [ 4821.076365] kobject: 'gpio-sim.0' (00000000b1d6276b): calling ktype release
> [ 4821.076370] kobject: 'gpio-sim.0': free name
> [ 4821.328246] kobject: 'gpio' (000000007e927b76): kobject_cleanup, parent 0000000000000000
> [ 4821.328252] kobject: 'gpio' (000000007e927b76): calling ktype release
> [ 4821.328258] kobject: 'gpio': free name
> [ 4821.360465] kobject: 'gpiochip2' (0000000034808fa5): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4821.360468] kobject: 'gpio' (000000008afdcce8): kobject_cleanup, parent 0000000000000000
> [ 4821.360470] kobject: 'gpio' (000000008afdcce8): calling ktype release
> [ 4821.360475] kobject: 'gpio': free name
> [ 4821.392179] kobject: 'gpio-sim.0' (00000000b204b566): kobject_cleanup, parent 0000000000000000
> [ 4821.392186] kobject: 'gpio-sim.0' (00000000b204b566): calling ktype release
> [ 4821.392193] kobject: 'gpio-sim.0': free name
> [ 4821.392196] kobject: 'gpiochip515' (000000002b851bb5): kobject_cleanup, parent 0000000000000000
> [ 4821.392221] kobject: 'gpiochip515' (000000002b851bb5): calling ktype release
> [ 4821.392226] kobject: 'gpiochip515': free name
> [ 4821.428255] kobject: 'gpio-sim.0' (00000000b9ef5a28): kobject_cleanup, parent 0000000000000000
> [ 4821.428262] kobject: 'gpio-sim.0' (00000000b9ef5a28): calling ktype release
> [ 4821.428283] kobject: 'gpio-sim.0': free name
> [ 4821.428291] kobject: 'gpiochip4' (00000000e06680f5): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4821.460377] kobject: 'gpiochip5' (000000004ef2dca6): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4821.460380] kobject: 'gpiochip532' (00000000ac07803f): kobject_cleanup, parent 0000000000000000
> [ 4821.460382] kobject: 'gpiochip532' (00000000ac07803f): calling ktype release
> [ 4821.460386] kobject: 'gpiochip532': free name
> [ 4821.488407] kobject: 'gpio' (00000000dedc22f2): kobject_cleanup, parent 0000000000000000
> [ 4821.488426] kobject: 'gpio' (00000000dedc22f2): calling ktype release
> [ 4821.488432] kobject: 'gpio': free name
> [ 4821.524217] kobject: 'gpiochip7' (000000006b8d9c99): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4821.588303] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4821.588372] kobject: 'gpiochip8' (00000000cb0b3463): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4821.588375] kobject: 'gpio' (0000000016f05b5a): kobject_cleanup, parent 0000000000000000
> [ 4821.588377] kobject: 'gpio' (0000000016f05b5a): calling ktype release
> [ 4821.588380] kobject: 'gpio': free name
> [ 4821.616206] kobject: 'gpiochip553' (0000000010cfe833): kobject_cleanup, parent 0000000000000000
> [ 4821.616213] kobject: 'gpiochip553' (0000000010cfe833): calling ktype release
> [ 4821.616224] kobject: 'gpiochip553': free name
> [ 4821.616228] kobject: 'gpio' (00000000886e1a77): kobject_cleanup, parent 0000000000000000
> [ 4821.616230] kobject: 'gpio' (00000000886e1a77): calling ktype release
> [ 4821.616234] kobject: 'gpio': free name
> [ 4821.652317] kobject: 'gpio-sim.0' (000000008ef7f514): kobject_cleanup, parent 0000000000000000
> [ 4821.652323] kobject: 'gpio-sim.0' (000000008ef7f514): calling ktype release
> [ 4821.652348] kobject: 'gpio-sim.0': free name
> [ 4821.684240] kobject: 'gpiochip12' (0000000051b24fd2): kobject_cleanup, parent 0000000000000000
> [ 4821.684246] kobject: 'gpiochip12' (0000000051b24fd2): calling ktype release
> [ 4821.684275] kobject: 'gpiochip12': free name
> [ 4821.748311] kobject: 'gpio-sim.0' (00000000cd797c7b): kobject_cleanup, parent 0000000000000000
> [ 4821.748317] kobject: 'gpio-sim.0' (00000000cd797c7b): calling ktype release
> [ 4821.748325] kobject: 'gpio-sim.0': free name
> [ 4821.748328] kobject: 'gpio' (000000006cce49d7): kobject_cleanup, parent 0000000000000000
> [ 4821.748330] kobject: 'gpio' (000000006cce49d7): calling ktype release
> [ 4821.748333] kobject: 'gpio': free name
> [ 4821.812244] kobject: 'gpiochip14' (0000000092a079b6): kobject_release, parent 0000000000000000 (delayed 1000)
> [ 4821.840208] kobject: 'gpiochip15' (00000000b0535d8d): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4821.872262] kobject: 'gpiochip580' (00000000f6371a1e): kobject_cleanup, parent 0000000000000000
> [ 4821.872269] kobject: 'gpiochip580' (00000000f6371a1e): calling ktype release
> [ 4821.872277] kobject: 'gpiochip580': free name
> [ 4821.904224] kobject: 'gpio' (0000000005a238f5): kobject_cleanup, parent 0000000000000000
> [ 4821.904230] kobject: 'gpio' (0000000005a238f5): calling ktype release
> [ 4821.904235] kobject: 'gpio': free name
> [ 4822.036185] kobject: 'gpio-sim.0' (00000000f462f78a): kobject_cleanup, parent 0000000000000000
> [ 4822.036192] kobject: 'gpio-sim.0' (00000000f462f78a): calling ktype release
> [ 4822.036198] kobject: 'gpio-sim.0': free name
> [ 4822.036202] kobject: 'gpiochip589' (000000007e1cf13a): kobject_cleanup, parent 0000000000000000
> [ 4822.036204] kobject: 'gpiochip589' (000000007e1cf13a): calling ktype release
> [ 4822.036206] kobject: 'gpiochip589': free name
> [ 4822.068252] kobject: 'gpiochip597' (00000000a32f70da): kobject_cleanup, parent 0000000000000000
> [ 4822.068258] kobject: 'gpiochip597' (00000000a32f70da): calling ktype release
> [ 4822.068265] kobject: 'gpiochip597': free name
> [ 4822.384245] kobject: 'gpiochip1' (00000000c6873be9): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4822.384248] kobject: 'gpiochip513' (00000000307a0461): kobject_cleanup, parent 0000000000000000
> [ 4822.384250] kobject: 'gpiochip513' (00000000307a0461): calling ktype release
> [ 4822.384271] kobject: 'gpiochip513': free name
> [ 4822.384286] kobject: 'gpio-sim.0' (00000000401b009a): kobject_cleanup, parent 0000000000000000
> [ 4822.384288] kobject: 'gpio-sim.0' (00000000401b009a): calling ktype release
> [ 4822.384294] kobject: 'gpio-sim.0': free name
> [ 4822.384297] kobject: 'gpiochip514' (000000008e860d8b): kobject_cleanup, parent 0000000000000000
> [ 4822.384298] kobject: 'gpiochip514' (000000008e860d8b): calling ktype release
> [ 4822.384302] kobject: 'gpiochip514': free name
> [ 4822.384304] kobject: 'gpiochip2' (0000000034808fa5): kobject_cleanup, parent 0000000000000000
> [ 4822.384305] kobject: 'gpiochip2' (0000000034808fa5): calling ktype release
> [ 4822.384312] kobject: 'gpiochip2': free name
> [ 4822.416325] kobject: 'gpiochip3' (00000000f89849bd): kobject_cleanup, parent 0000000000000000
> [ 4822.416331] kobject: 'gpiochip3' (00000000f89849bd): calling ktype release
> [ 4822.416344] kobject: 'gpiochip3': free name
> [ 4822.452250] kobject: 'gpiochip4' (00000000e06680f5): kobject_cleanup, parent 0000000000000000
> [ 4822.452256] kobject: 'gpiochip4' (00000000e06680f5): calling ktype release
> [ 4822.452265] kobject: 'gpiochip4': free name
> [ 4822.548316] kobject: 'gpiochip7' (000000006b8d9c99): kobject_cleanup, parent 0000000000000000
> [ 4822.548322] kobject: 'gpiochip7' (000000006b8d9c99): calling ktype release
> [ 4822.548350] kobject: 'gpiochip7': free name
> [ 4822.608239] kobject: 'gpiochip8' (00000000cb0b3463): kobject_cleanup, parent 0000000000000000
> [ 4822.608260] kobject: 'gpiochip8' (00000000cb0b3463): calling ktype release
> [ 4822.608275] kobject: 'gpiochip8': free name
> [ 4822.640315] kobject: 'gpiochip554' (00000000e0038afb): kobject_cleanup, parent 0000000000000000
> [ 4822.640339] kobject: 'gpiochip554' (00000000e0038afb): calling ktype release
> [ 4822.640343] kobject: 'gpio' (00000000e467cb12): kobject_cleanup, parent 0000000000000000
> [ 4822.640346] kobject: 'gpiochip554': free name
> [ 4822.640348] kobject: 'gpio' (00000000e467cb12): calling ktype release
> [ 4822.640349] kobject: 'gpio-sim.1' (0000000018f833bf): kobject_cleanup, parent 0000000000000000
> [ 4822.640351] kobject: 'gpio-sim.1' (0000000018f833bf): calling ktype release
> [ 4822.640354] kobject: 'gpio': free name
> [ 4822.640360] kobject: 'gpio-sim.1': free name
> [ 4822.640408] kobject: 'gpio-sim.2' (00000000bbfd5238): kobject_cleanup, parent 0000000000000000
> [ 4822.640410] kobject: 'gpio-sim.2' (00000000bbfd5238): calling ktype release
> [ 4822.640416] kobject: 'gpio-sim.2': free name
> [ 4822.644186] kobject: 'gpio-sim.0' (00000000461517ae): kobject_cleanup, parent 0000000000000000
> [ 4822.644192] kobject: 'gpio-sim.0' (00000000461517ae): calling ktype release
> [ 4822.644198] kobject: 'gpio-sim.0': free name
> [ 4822.644266] kobject: 'gpio-sim.0' (00000000bb358104): kobject_cleanup, parent 0000000000000000
> [ 4822.644268] kobject: 'gpio-sim.0' (00000000bb358104): calling ktype release
> [ 4822.644272] kobject: 'gpio-sim.0': free name
> [ 4822.896320] kobject: 'gpiochip572' (00000000178509ff): kobject_cleanup, parent 0000000000000000
> [ 4822.896326] kobject: 'gpiochip572' (00000000178509ff): calling ktype release
> [ 4822.896334] kobject: 'gpiochip572': free name
> [ 4822.896337] kobject: 'gpio-sim.0' (000000005418b2af): kobject_cleanup, parent 0000000000000000
> [ 4822.896339] kobject: 'gpio-sim.0' (000000005418b2af): calling ktype release
> [ 4822.896343] kobject: 'gpio-sim.0': free name
> [ 4822.900449] kobject: 'gpiochip564' (00000000ee87da7b): kobject_cleanup, parent 0000000000000000
> [ 4822.900455] kobject: 'gpiochip564' (00000000ee87da7b): calling ktype release
> [ 4822.900461] kobject: 'gpiochip17' (000000006ee06561): kobject_release, parent 0000000000000000 (delayed 750)
> [ 4822.900463] kobject: 'gpiochip564': free name
> [ 4822.900524] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4823.152251] kobject: 'gpio' (0000000064e73453): kobject_cleanup, parent 0000000000000000
> [ 4823.152257] kobject: 'gpio' (0000000064e73453): calling ktype release
> [ 4823.152260] kobject: 'gpio': free name
> [ 4823.156258] kobject: 'gpio' (000000001bd064f6): kobject_cleanup, parent 0000000000000000
> [ 4823.156277] kobject: 'gpio' (000000001bd064f6): calling ktype release
> [ 4823.156307] kobject: 'gpio': free name
> [ 4823.408426] kobject: 'gpio-sim.0' (000000007cf5eda9): kobject_cleanup, parent 0000000000000000
> [ 4823.408433] kobject: 'gpio-sim.0' (000000007cf5eda9): calling ktype release
> [ 4823.408433] kobject: 'gpiochip531' (00000000ad4538e8): kobject_cleanup, parent 0000000000000000
> [ 4823.408436] kobject: 'gpiochip531' (00000000ad4538e8): calling ktype release
> [ 4823.408444] kobject: 'gpio-sim.0': free name
> [ 4823.408452] kobject: 'gpiochip531': free name
> [ 4823.408456] kobject: 'gpio-sim.0' (00000000ca4e28ab): kobject_cleanup, parent 0000000000000000
> [ 4823.408459] kobject: 'gpio-sim.0' (00000000ca4e28ab): calling ktype release
> [ 4823.408467] kobject: 'gpio-sim.0': free name
> [ 4823.408476] kobject: 'gpiochip0' (000000007063b679): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4823.408523] kobject: 'gpio' (00000000a1399cd0): kobject_cleanup, parent 0000000000000000
> [ 4823.408525] kobject: 'gpio' (00000000a1399cd0): calling ktype release
> [ 4823.408533] kobject: 'gpio': free name
> [ 4823.664421] kobject: 'gpio-sim.0' (00000000e8c2899c): kobject_cleanup, parent 0000000000000000
> [ 4823.664426] kobject: 'gpio-sim.0' (00000000e8c2899c): calling ktype release
> [ 4823.664450] kobject: 'gpio-sim.0': free name
> [ 4823.664516] kobject: 'gpiochip10' (00000000e3becc55): kobject_release, parent 0000000000000000 (delayed 500)
> [ 4823.664524] kobject: 'gpiochip552' (000000001750e50f): kobject_cleanup, parent 0000000000000000
> [ 4823.664526] kobject: 'gpiochip552' (000000001750e50f): calling ktype release
> [ 4823.664530] kobject: 'gpiochip552': free name
> [ 4823.664533] kobject: 'gpio' (00000000176df109): kobject_cleanup, parent 0000000000000000
> [ 4823.664535] kobject: 'gpio' (00000000176df109): calling ktype release
> [ 4823.664538] kobject: 'gpio': free name
> [ 4823.664556] kobject: 'gpiochip6' (00000000a22546a6): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4823.664558] kobject: 'gpiochip533' (000000003541481f): kobject_cleanup, parent 0000000000000000
> [ 4823.664560] kobject: 'gpiochip533' (000000003541481f): calling ktype release
> [ 4823.664564] kobject: 'gpiochip533': free name
> [ 4823.924314] kobject: 'gpiochip588' (0000000075b76b85): kobject_cleanup, parent 0000000000000000
> [ 4823.924334] kobject: 'gpiochip588' (0000000075b76b85): calling ktype release
> [ 4823.924340] kobject: 'gpiochip588': free name
> [ 4823.924344] kobject: 'gpiochip13' (00000000dc27f1aa): kobject_cleanup, parent 0000000000000000
> [ 4823.924346] kobject: 'gpiochip13' (00000000dc27f1aa): calling ktype release
> [ 4823.924354] kobject: 'gpiochip13': free name
> [ 4823.924371] kobject: 'gpiochip16' (000000002be607c1): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4824.176336] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4824.176381] kobject: 'gpiochip19' (000000008385ae47): kobject_release, parent 0000000000000000 (delayed 250)
> [ 4824.400258] kobject: 'gpiochip1' (00000000c6873be9): kobject_cleanup, parent 0000000000000000
> [ 4824.400264] kobject: 'gpiochip1' (00000000c6873be9): calling ktype release
> [ 4824.400276] kobject: 'gpiochip1': free name
> [ 4824.432259] kobject: 'gpiochip0' (000000007063b679): kobject_cleanup, parent 0000000000000000
> [ 4824.432266] kobject: 'gpiochip0' (000000007063b679): calling ktype release
> [ 4824.432278] kobject: 'gpiochip0': free name
> [ 4824.688241] kobject: 'gpiochip5' (000000004ef2dca6): kobject_cleanup, parent 0000000000000000
> [ 4824.688248] kobject: 'gpiochip5' (000000004ef2dca6): calling ktype release
> [ 4824.688261] kobject: 'gpiochip5': free name
> [ 4824.692227] kobject: 'gpiochip11' (00000000b39a3c5f): kobject_cleanup, parent 0000000000000000
> [ 4824.692246] kobject: 'gpiochip11' (00000000b39a3c5f): calling ktype release
> [ 4824.692278] kobject: 'gpiochip11': free name
> [ 4824.692290] kobject: 'gpiochip6' (00000000a22546a6): kobject_cleanup, parent 0000000000000000
> [ 4824.692317] kobject: 'gpiochip6' (00000000a22546a6): calling ktype release
> [ 4824.692338] kobject: 'gpiochip6': free name
> [ 4824.948242] kobject: 'gpiochip15' (00000000b0535d8d): kobject_cleanup, parent 0000000000000000
> [ 4824.948247] kobject: 'gpiochip15' (00000000b0535d8d): calling ktype release
> [ 4824.948251] kobject: 'gpiochip16' (000000002be607c1): kobject_cleanup, parent 0000000000000000
> [ 4824.948255] kobject: 'gpiochip16' (000000002be607c1): calling ktype release
> [ 4824.948259] kobject: 'gpiochip15': free name
> [ 4824.948272] kobject: 'gpiochip16': free name
> [ 4825.200324] kobject: 'gpiochip18' (00000000a8ca1f8c): kobject_cleanup, parent 0000000000000000
> [ 4825.200330] kobject: 'gpiochip18' (00000000a8ca1f8c): calling ktype release
> [ 4825.200343] kobject: 'gpiochip18': free name
> [ 4825.204318] kobject: 'gpiochip19' (000000008385ae47): kobject_cleanup, parent 0000000000000000
> [ 4825.204325] kobject: 'gpiochip19' (000000008385ae47): calling ktype release
> [ 4825.204340] kobject: 'gpiochip19': free name
> [ 4825.680450] kobject: 'gpiochip10' (00000000e3becc55): kobject_cleanup, parent 0000000000000000
> [ 4825.680470] kobject: 'gpiochip10' (00000000e3becc55): calling ktype release
> [ 4825.680488] kobject: 'gpiochip10': free name
> [ 4825.716394] kobject: 'gpiochip9' (00000000bdaa0a47): kobject_cleanup, parent 0000000000000000
> [ 4825.716396] kobject: 'gpiochip9' (00000000bdaa0a47): calling ktype release
> [ 4825.716405] kobject: 'gpiochip9': free name
> [ 4825.968324] kobject: 'gpiochip17' (000000006ee06561): kobject_cleanup, parent 0000000000000000
> [ 4825.968331] kobject: 'gpiochip17' (000000006ee06561): calling ktype release
> [ 4825.968360] kobject: 'gpiochip17': free name
> [ 4825.968363] kobject: 'gpiochip14' (0000000092a079b6): kobject_cleanup, parent 0000000000000000
> [ 4825.968367] kobject: 'gpiochip14' (0000000092a079b6): calling ktype release
> [ 4825.968377] kobject: 'gpiochip14': free name
> [ 4830.764748] kobject: 'gpio-sim' (000000005b8d0726): kobject_release, parent 000000007425b13f (delayed 750)
> [ 4833.908238] kobject: 'gpio-sim' (000000005b8d0726): kobject_cleanup, parent 000000007425b13f
> [ 4833.908244] kobject: 'gpio-sim' (000000005b8d0726): auto cleanup kobject_del
> [ 4833.908245] kobject: 'gpio-sim' (000000005b8d0726): auto cleanup 'remove' event
> [ 4833.908247] kobject: 'gpio-sim' (000000005b8d0726): kobject_uevent_env
> [ 4833.908273] kobject: 'gpio-sim' (000000005b8d0726): fill_kobj_path: path = '/bus/platform/drivers/gpio-sim'
> [ 4833.908311] kobject: 'gpio-sim' (000000005b8d0726): calling ktype release
> [ 4833.908315] kobject: 'gpio-sim': free name
> [ 4834.932303] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_release, parent 0000000093357d30 (delayed 250)
> [ 4835.952388] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_cleanup, parent 0000000093357d30
> [ 4835.952413] kobject: 'gpio_sim' (0000000096ea0bb1): auto cleanup kobject_del
> [ 4835.952415] kobject: 'gpio_sim' (0000000096ea0bb1): auto cleanup 'remove' event
> [ 4835.952416] kobject: 'gpio_sim' (0000000096ea0bb1): kobject_uevent_env
> [ 4835.952424] kobject: 'gpio_sim' (0000000096ea0bb1): fill_kobj_path: path = '/module/gpio_sim'
> [ 4835.952445] kobject: 'gpio_sim' (0000000096ea0bb1): calling ktype release
> [ 4835.952448] kobject: 'gpio_sim': free name
> 
> 
> > > > > > Or maybe the chip->gc.parent should be changed to something else (actual GPIO
> > > > > > device, but then it's unclear how to provide the attributes in non-racy way
> > > > > Really, dunno. I have to repeat that my learning curve cannot adapt so quickly.
> > > > > 
> > > > > I merely gave the report of KMEMLEAK, otherwise I am not a Linux kernel
> > > > > device expert nor would be appropriate to try the craft not earned ;-)
> 
> With all of these additional debugging, cat /sys/kernel/debug/kmemleak
> showed nothing new.
> 
> I believe this is reasonably safe.
> 
> However, I was unsuccessful in seeing gpio trace, even with
> echo 1 > /sys/kernel/tracing/events/gpio/enable ... :-/

It's available in the trace buffer (you need to read a documentation to
understand how it works).

-- 
With Best Regards,
Andy Shevchenko

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