[Bug 103642] [BAT] igt at gem_ctx_create@basic-files - Softdog Incomplete - BUG kmalloc-8192 (Tainted: G U ): Padding overwritten. 0xffff88016a93e742-0xffff88016a93e77f

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103642

--- Comment #4 from Marta Löfstedt <marta.lofstedt at intel.com> ---
(In reply to Chris Wilson from comment #2)
> One random memcorruption fixed:
> 
> commit 7d622351c94172a42bfe9b13bdb0fdc2be90ed3b
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Dec 13 09:48:02 2017 +0000
> 
>     drm/i915/fence: Use rcu to defer freeing of irq_work
>     
>     It is illegal to perform an immediate free of the struct irq_work from
>     inside the irq_work callback (as irq_work_run_list modifies work->flags
>     after execution of the work->func()). As we use the irq_work to
>     coordinate the freeing of the callback from two different softirq paths,
>     we need to defer the kfree from inside our irq_work callback, for which
>     we can use kfree_rcu.
>     
>     Fixes: 81c0ed21aa91 ("drm/i915/fence: Avoid del_timer_sync() from inside
> a timer")
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>     Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>     Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>     Link:
> https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1-
> chris at chris-wilson.co.uk
> 
> Hopefully this explains a lot of weirdness.

I still see a lot of weirdness from the GLK-DSI machine. Chris, if you want to
close this bug feel free. I just wanted not file this on bug 103514, since this
looked extra weird enough to deserve its own bug.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20171214/78ffccb6/attachment.html>