[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #161 from Matteo Croce <rootkit85 at yahoo.it> ---
same happens with 3.15.0 on Ubuntu 14.04 64 bit

Jul 11 12:43:41 localhost kernel: [42049.462542] [drm] stuck on render ring
Jul 11 12:43:41 localhost kernel: [42049.463330] [drm] GPU HANG: ecode
0:0x00ffffff, in chrome [2172], reason: Ring hung, action: reset
Jul 11 12:43:41 localhost kernel: [42049.463334] [drm] GPU hangs can indicate a
bug anywhere in the entire gfx stack, including userspace.
Jul 11 12:43:41 localhost kernel: [42049.463335] [drm] Please file a _new_ bug
report on bugs.freedesktop.org against DRI -> DRM/Intel
Jul 11 12:43:41 localhost kernel: [42049.463336] [drm] drm/i915 developers can
then reassign to the right component if it's not a kernel issue.
Jul 11 12:43:41 localhost kernel: [42049.463337] [drm] The gpu crash dump is
required to analyze gpu hangs, so please always attach it.
Jul 11 12:43:41 localhost kernel: [42049.463338] [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Jul 11 12:43:43 localhost kernel: [42051.464623] [drm] Enabling RC6 states: RC6
on, RC6p off, RC6pp off
Jul 11 12:43:47 localhost kernel: [42055.468816] [drm] stuck on render ring
Jul 11 12:43:47 localhost kernel: [42055.469614] [drm] GPU HANG: ecode
0:0x00ffffff, in chrome [2172], reason: Ring hung, action: reset
Jul 11 12:43:49 localhost kernel: [42057.470899] [drm] Enabling RC6 states: RC6
on, RC6p off, RC6pp off
Jul 11 12:43:53 localhost kernel: [42061.439056] [drm] stuck on render ring
Jul 11 12:43:53 localhost kernel: [42061.439867] [drm] GPU HANG: ecode
0:0xfeffffff, in chrome [2172], reason: Ring hung, action: reset

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