[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
bugzilla-daemon at freedesktop.org
Wed Dec 13 12:52:44 UTC 2017
https://bugs.freedesktop.org/show_bug.cgi?id=103642
--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
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@chris-wilson.co.uk
Hopefully this explains a lot of weirdness.
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