[Bug 99671] [v4.10] GPU HANG: ecode 6:0:0xbd69ffff, in compiz [2609], reason: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99671

--- Comment #29 from Josh Holland <anowlcalledjosh at gmail.com> ---
Booted with i915.semaphores=0 (still on drm-tip 58294e406 with patch from #19),
then got a 4.10-like hang where even Magic SysRq stopped working. I can upload
the whole dmesg if you want, but I assume this is the relevant part, ending
with the final message (the previous message was half an hour ago when
bamfdaemon died, which it does occasionally):

Feb 14 16:51:03 yes kernel: [ 3435.777321] [drm] GPU HANG: ecode
6:0:0xbde7ffff, in compiz [3786], reason: Hang on render ring, action: reset
Feb 14 16:51:03 yes kernel: [ 3435.777323] [drm] GPU hangs can indicate a bug
anywhere in the entire gfx stack, including userspace.
-- ...how to report GPU hangs... --
Feb 14 16:51:03 yes kernel: [ 3435.777324] [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Feb 14 16:51:03 yes kernel: [ 3435.777375] drm/i915: Resetting chip after gpu
hang
Feb 14 16:51:06 yes kernel: [ 3438.780562] asynchronous wait on fence
i915:[global]:3b94e timed out
Feb 14 16:51:11 yes kernel: [ 3443.772358] drm/i915: Resetting chip after gpu
hang
Feb 14 16:51:23 yes kernel: [ 3455.931636] [drm:drm_atomic_helper_swap_state
[drm_kms_helper]] *ERROR* [CRTC:31:pipe A] hw_done timed out
Feb 14 16:51:24 yes kernel: [ 3456.955546] asynchronous wait on fence
i915:[global]:3b954 timed out
Feb 14 16:51:34 yes kernel: [ 3466.171061]
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[CRTC:31:pipe A] hw_done timed out
Feb 14 16:51:35 yes kernel: [ 3467.195005]
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[CRTC:31:pipe A] hw_done timed out

Unfortunately no GPU dump, due to the aforementioned lack of response to even
an alt-SysRq-B, let alone ctrl-alt-F1.

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