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On Sat, Nov 05, 2022 at 02:00:24AM -0400, Steven Rostedt wrote:
>
> Back in April, I posted an RFC patch set to help mitigate a common issue
> where a timer gets armed just before it is freed, and when the timer
> goes off, it crashes in the timer code without any evidence of who the
> culprit was. I got side tracked and never finished up on that patch set.
> Since this type of crash is still our #1 crash we are seeing in the field,
> it has become a priority again to finish it.
>
> The last version of that patch set is here:
>
> https://lore.kernel.org/all/20221104054053.431922658@xxxxxxxxxxx/
>
> I'm calling this version 4a as it only has obvious changes were the timer that
> is being shutdown is in the same function where it will be freed or released,
> as this series should be "safe" for adding. I'll be calling the other patches
> 4b for the next merge window.
>
Just in case you didn't notice:
Looking through the resulting code, I think some of the remaining
calls to del_singleshot_timer_sync() can be converted as well.
The calls in drivers/staging/wlan-ng/prism2usb.c:prism2sta_disconnect_usb()
are obvious (the containing data structure is freed in the same function).
For drivers/char/tpm/tpm-dev-common.c:tpm_common_release(), the containing
data structure is freed in the calling code.
Thanks,
Guenter
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