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Date: Sun, 18 Jan 2009 23:50:09 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Andrey Borzenkov <arvidjaar@...l.ru>
Cc: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [2.6.29-rc2] Inconsistent lock state on resume in hres_timers_resume
On Sunday 18 January 2009, Andrey Borzenkov wrote:
> On 18 января 2009 23:21:24 Rafael J. Wysocki wrote:
>
> > > > As far as I can tell, timekeeping_resume is called via class
> > > > ->resume method; and according to comments in sysdev_resume() and
> > > > device_power_up(), they are called with interrupts disabled.
> > > >
> > > > Looking at suspend_enter, irqs *are* disabled at this point.
> > > >
> > > > So it actually looks like something (may be some driver)
> > > > unconditionally enabled irqs in resume path.
> > > >
> > > > I believe the patch should be hold back until this is clarified.
> > >
> > > That's a nice theory!
> >
> > That would be a bad bug.
> >
>
> If the below is correct, I wonder, why I am the only one to see it?
>
> [ 134.727381] PM: Syncing filesystems ... done.
> [ 134.767483] orinoco_cs 0.0: firmware: requesting agere_sta_fw.bin
> [ 134.809435] Freezing user space processes ... (elapsed 0.02 seconds)
> done.
> [ 134.831823] Freezing remaining freezable tasks ... (elapsed 0.00 seconds)
> done.
> [ 134.832520] Suspending console(s) (use no_console_suspend to debug)
> [ 134.844050] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> [ 135.335944] sd 0:0:0:0: [sda] Stopping disk
> [ 136.019819] pci 0000:01:00.0: power state changed by ACPI to D3
> [ 136.034461] e100 0000:00:0a.0: PME# enabled
> [ 136.034699] e100 0000:00:0a.0: wake-up capability enabled by ACPI
> [ 136.034868] e100 0000:00:0a.0: PCI INT A disabled
> [ 136.097607] ALI 5451 0000:00:06.0: PCI INT A disabled
> [ 136.110484] ALI 5451 0000:00:06.0: power state changed by ACPI to D3
> [ 136.894487] pata_ali 0000:00:04.0: can't derive routing for PCI INT A
> [ 136.906958] ohci_hcd 0000:00:02.0: PME# enabled
> [ 136.907177] ohci_hcd 0000:00:02.0: wake-up capability enabled by ACPI
> [ 136.907208] ohci_hcd 0000:00:02.0: PCI INT A disabled
> [ 136.923328] ACPI: Preparing to enter system sleep state S3
> [ 136.937129] ------------[ cut here ]------------
> [ 136.937142] WARNING: at /home/bor/src/linux-git/drivers/base/sys.c:400
> sysdev_suspend+0x268/0x270()
> [ 136.937151] Hardware name: PORTEGE 4000
> [ 136.937184] timekeeping_suspend+0x0/0x80 enabled IRQs
> ...
> [ 136.937323] Pid: 4305, comm: pm-suspend Not tainted 2.6.29-rc2-1avb #5
> [ 136.937330] Call Trace:
> [ 136.937358] [<c011f8b3>] warn_slowpath+0x73/0xd0
> [ 136.937373] [<c0143028>] ? mark_held_locks+0x48/0x90
> [ 136.937395] [<c0309245>] ? _spin_unlock_irqrestore+0x35/0x60
> [ 136.937406] [<c0143269>] ? trace_hardirqs_on_caller+0x139/0x190
> [ 136.937433] [<c0106c07>] ? init_pit_timer+0x67/0xf0
> [ 136.937442] [<c01432cb>] ? trace_hardirqs_on+0xb/0x10
> [ 136.937451] [<c0140e05>] ? lock_release_holdtime+0x35/0x210
> [ 136.937466] [<c013db50>] ? clockevents_notify+0x30/0x80
> [ 136.937475] [<c030928d>] ? _spin_unlock+0x1d/0x20
> [ 136.937484] [<c013db50>] ? clockevents_notify+0x30/0x80
> [ 136.937495] [<c0273828>] sysdev_suspend+0x268/0x270
> [ 136.937504] [<c013ab30>] ? timekeeping_suspend+0x0/0x80
> [ 136.937535] [<c027929f>] device_power_down+0xef/0x110
> [ 136.937564] [<c0150462>] suspend_devices_and_enter+0xb2/0x150
> [ 136.937575] [<c0150c6f>] ? freeze_processes+0x3f/0x90
> [ 136.937584] [<c0150654>] enter_state+0xf4/0x140
> [ 136.937594] [<c015071d>] state_store+0x7d/0xc0
> [ 136.937602] [<c01506a0>] ? state_store+0x0/0xc0
> [ 136.937629] [<c0202de4>] kobj_attr_store+0x24/0x30
> [ 136.937640] [<c01dd57c>] sysfs_write_file+0x9c/0x100
> [ 136.937673] [<c01991ac>] vfs_write+0x9c/0x160
> [ 136.937683] [<c0103494>] ? restore_nocheck_notrace+0x0/0xe
> [ 136.937692] [<c01dd4e0>] ? sysfs_write_file+0x0/0x100
> [ 136.937701] [<c019932d>] sys_write+0x3d/0x70
> [ 136.937711] [<c0103371>] sysenter_do_call+0x12/0x31
> [ 136.937718] ---[ end trace a8e2ee01b2b45f69 ]---
> [ 136.937727] ------------[ cut here ]------------
>
> This is with this patch:
>
>
> diff --git a/drivers/base/sys.c b/drivers/base/sys.c
> index c98c31e..7245496 100644
> --- a/drivers/base/sys.c
> +++ b/drivers/base/sys.c
> @@ -341,13 +341,17 @@ static void __sysdev_resume(struct sys_device *dev)
> struct sysdev_driver *drv;
>
> /* First, call the class-specific one */
> - if (cls->resume)
> + if (cls->resume) {
> cls->resume(dev);
> + WARN(!irqs_disabled(), "%pF enabled IRQs\n", cls->resume);
> + }
>
> /* Call auxillary drivers next. */
> list_for_each_entry(drv, &cls->drivers, entry) {
> - if (drv->resume)
> + if (drv->resume) {
> drv->resume(dev);
> + WARN(!irqs_disabled(), "%pF enabled IRQs\n", drv->resume);
> + }
> }
> }
>
> @@ -384,6 +388,7 @@ int sysdev_suspend(pm_message_t state)
> list_for_each_entry(drv, &cls->drivers, entry) {
> if (drv->suspend) {
> ret = drv->suspend(sysdev, state);
> + WARN(!irqs_disabled(), "%pF enabled IRQs\n", drv-
> >suspend);
> if (ret)
> goto aux_driver;
> }
> @@ -392,6 +397,7 @@ int sysdev_suspend(pm_message_t state)
> /* Now call the generic one */
> if (cls->suspend) {
> ret = cls->suspend(sysdev, state);
> + WARN(!irqs_disabled(), "%pF enabled IRQs\n", cls->suspend);
> if (ret)
> goto cls_driver;
> }
Well, it seems one of the notifiers does that.
Thanks,
Rafael
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