[Bug 111926] [CI][BAT] igt at i915_selftest@live_workarounds - dmesg-fail - live_isolated_whitelist failed with error -22, live_dirty_whitelist failed with error -22

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111926

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Judging by the values, it looks like a use-after-free, so I'm betting on

commit 41f0bc49f7f2014feab8b278fea2adaea6ccaf4e (HEAD -> drm-intel-next-queued,
drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Oct 9 07:17:59 2019 +0100

    drm/i915/selftests: Hold request reference over waits

    Take a reference on the request before submitting it to the HW and then
    waiting on it for selftest_workarounds. Once submitted, the request may
    be freed by a background worker, unless we take an extra reference for
    ourselves.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=111926
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20191009061759.3189-1-chris@chris-wilson.co.uk

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