[Bug 111427] [CI][BAT] igt at gem_sync@basic-store-each - incomplete - Kernel panic - not syncing: Fatal exception in interrupt

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111427

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

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

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
I think I understand...

commit a20ab592d1a87218229109d109b8e2feae6f598d
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Aug 21 15:23:36 2019 +0100

    drm/i915/execlists: Set priority hint prior to submission

    Since we now run process_csb() outside of the engine->active.lock, we
    can process a CS-event immediately upon our ELSP write. As we currently
    inspect the pending queue *after* the ELSP write, there is an
    opportunity for a CS-event to update the pending queue before we can
    read it, making ourselves chases an invalid pointer.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111427
    Fixes: df403069029d ("drm/i915/execlists: Lift process_csb() out of the
irq-off spinlock")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190821142336.21609-1-chris@chris-wilson.co.uk

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