[Bug 80709] [snb] semaphores deadlock -- testing improved deadlock breaker

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80709

--- Comment #5 from Stefan Huber <shuber at sthu.org> ---
(In reply to comment #4)
> It should emit a warning when it fires, could you check your logs to see if
> you have had such an event?

# zcat messages-* | cat - messages | grep "waiting on" -A 8
Jul 18 16:33:09 euklid kernel: [ 9291.280145] render ring waiting on blitter
ring [recursion depth 0], seqno 0x801bd [current 0x801bd]
Jul 18 16:33:09 euklid kernel: [ 9291.280639] [drm] GPU HANG: ecode
-1:0x00000000, reason: Kicking stuck semaphore on render ring, action: continue
Jul 18 16:33:09 euklid kernel: [ 9291.280640] [drm] GPU hangs can indicate a
bug anywhere in the entire gfx stack, including userspace.
Jul 18 16:33:09 euklid kernel: [ 9291.280641] [drm] Please file a _new_ bug
report on bugs.freedesktop.org against DRI -> DRM/Intel
Jul 18 16:33:09 euklid kernel: [ 9291.280642] [drm] drm/i915 developers can
then reassign to the right component if it's not a kernel issue.
Jul 18 16:33:09 euklid kernel: [ 9291.280642] [drm] The gpu crash dump is
required to analyze gpu hangs, so please always attach it.
Jul 18 16:33:09 euklid kernel: [ 9291.280643] [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Jul 18 16:33:09 euklid kernel: [ 9291.280669] blitter ring waiting on render
ring [recursion depth 0], seqno 0x801c1 [current 0x801bf]

Interesting, I cannot remember that that there was a crash yesterday.

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