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Message-ID: <75784ae1-6bf9-3b94-1097-d750c366e7ea@gmail.com>
Date: Wed, 18 Jan 2023 14:00:14 -0600
From: Frank Rowand <frowand.list@...il.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
"Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: WARNING in __thermal_cooling_device_register()
Hi Daniel,
On 1/18/23 02:23, Daniel Lezcano wrote:
>
> Hi Frank,
>
> Thanks for reporting the WARNING.
>
> It is currently being fixed:
>
> https://lore.kernel.org/all/20230112154721.452292-1-caleb.connolly@linaro.org/
Thanks for that pointer!
Viresh did a V4 of the patch this morning, which worked for my case. I sent my
tested-by.
-Frank
>
> -- Daniel
>
>
> On 18/01/2023 08:38, Frank Rowand wrote:
>> I am getting two new warning traces in v6.2-rc1 on boot that are not present in v6.1-rc1.
>>
>> I have not done a bisect yet, but wanted to report the issue without further delay.
>>
>> The configuration is qcom_defconfig
>>
>> The system is a Qualcomm Dragon 8074
>>
>> I have not done any debugging, but noted some changes to the file that contains
>> __thermal_cooling_device_register() since 6.1-rc1:
>>
>> linux--6.2-rc> git log --oneline v6.1-rc1.. -- drivers/thermal/thermal_core.c
>> 4748f9687caa thermal: core: fix some possible name leaks in error paths
>> b778b4d782d4 thermal/core: Protect thermal device operations against thermal device removal
>> 05eeee2b51b4 thermal/core: Protect sysfs accesses to thermal operations with thermal zone mutex
>> 1c439dec359c thermal/core: Introduce locked version of thermal_zone_device_update
>> 30b2ae07d3d6 thermal/core: Delete device under thermal device zone lock
>> d35f29ed9d11 thermal/core: Destroy thermal zone device mutex in release function
>> e49a1e1ee078 thermal/core: fix error code in __thermal_cooling_device_register()
>> c408b3d1d9bb thermal: Validate new state in cur_state_store()
>>
>>
>>
>> The stack traces are:
>>
>> -----------[ cut here ]------------
>> WARNING: CPU: 0 PID: 31 at lib/kobject.c:718 kobject_put+0x114/0x29c
>> kobject: '(null)' ((ptrval)): is not initialized, yet kobject_put() is being called.
>> Modules linked in:
>> CPU: 0 PID: 31 Comm: kworker/u8:2 Not tainted 6.2.0-rc1 #1
>> Hardware name: Generic DT based system
>> Workqueue: events_unbound deferred_probe_work_func
>> unwind_backtrace from show_stack+0x10/0x14
>> show_stack from dump_stack_lvl+0x40/0x4c
>> dump_stack_lvl from __warn+0x7c/0x15c
>> __warn from warn_slowpath_fmt+0x98/0xcc
>> warn_slowpath_fmt from kobject_put+0x114/0x29c
>> kobject_put from __thermal_cooling_device_register+0x11c/0x388
>> __thermal_cooling_device_register from __power_supply_register+0x49c/0x5dc
>> __power_supply_register from devm_power_supply_register+0x54/0x90
>> devm_power_supply_register from smbb_charger_probe+0x358/0x61c
>> smbb_charger_probe from platform_probe+0x5c/0xb8
>> platform_probe from really_probe+0xe0/0x3dc
>> really_probe from __driver_probe_device+0x9c/0x208
>> __driver_probe_device from driver_probe_device+0x30/0xcc
>> driver_probe_device from __device_attach_driver+0xa8/0x120
>> __device_attach_driver from bus_for_each_drv+0x84/0xd4
>> bus_for_each_drv from __device_attach+0x108/0x1d8
>> __device_attach from bus_probe_device+0x84/0x8c
>> bus_probe_device from deferred_probe_work_func+0x9c/0xdc
>> deferred_probe_work_func from process_one_work+0x1d4/0x510
>> process_one_work from worker_thread+0x1fc/0x4d0
>> worker_thread from kthread+0xf4/0x124
>> kthread from ret_from_fork+0x14/0x2c
>> Exception stack(0xf0901fb0 to 0xf0901ff8)
>> 1fa0: 00000000 00000000 00000000 00000000
>> 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>> ---[ end trace 0000000000000000 ]---
>> ------------[ cut here ]------------
>> WARNING: CPU: 0 PID: 31 at lib/refcount.c:28 __thermal_cooling_device_register+0x11c/0x388
>> refcount_t: underflow; use-after-free.
>> Modules linked in:
>> CPU: 0 PID: 31 Comm: kworker/u8:2 Tainted: G W 6.2.0-rc1 #1
>> Hardware name: Generic DT based system
>> Workqueue: events_unbound deferred_probe_work_func
>> unwind_backtrace from show_stack+0x10/0x14
>> show_stack from dump_stack_lvl+0x40/0x4c
>> dump_stack_lvl from __warn+0x7c/0x15c
>> __warn from warn_slowpath_fmt+0x98/0xcc
>> warn_slowpath_fmt from __thermal_cooling_device_register+0x11c/0x388
>> __thermal_cooling_device_register from __power_supply_register+0x49c/0x5dc
>> __power_supply_register from devm_power_supply_register+0x54/0x90
>> devm_power_supply_register from smbb_charger_probe+0x358/0x61c
>> smbb_charger_probe from platform_probe+0x5c/0xb8
>> platform_probe from really_probe+0xe0/0x3dc
>> really_probe from __driver_probe_device+0x9c/0x208
>> __driver_probe_device from driver_probe_device+0x30/0xcc
>> driver_probe_device from __device_attach_driver+0xa8/0x120
>> __device_attach_driver from bus_for_each_drv+0x84/0xd4
>> bus_for_each_drv from __device_attach+0x108/0x1d8
>> __device_attach from bus_probe_device+0x84/0x8c
>> bus_probe_device from deferred_probe_work_func+0x9c/0xdc
>> deferred_probe_work_func from process_one_work+0x1d4/0x510
>> process_one_work from worker_thread+0x1fc/0x4d0
>> worker_thread from kthread+0xf4/0x124
>> kthread from ret_from_fork+0x14/0x2c
>> Exception stack(0xf0901fb0 to 0xf0901ff8)
>> 1fa0: 00000000 00000000 00000000 00000000
>> 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>> ---[ end trace 0000000000000000 ]---
>>
>>
>> -Frank
>
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