Re: WARNING in __thermal_cooling_device_register()

[Daniel Lezcano]

Hi Frank,

Thanks for reporting the WARNING.

It is currently being fixed:

https://lore.kernel.org/all/20230112154721.452292-1-caleb.connolly@xxxxxxxxxx/

  -- 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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