[Bug 89959] [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89959

--- Comment #33 from cprigent <christophe.prigent at intel.com> ---
Tested again on SKL-S after a full power cycle (last time I first reproduced
the GPU hang with last version of igt, reset was not enough).
Test works several times (from 4 to 10 iterations) then GPU hang is reproduced.

Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831098] [drm] stuck
on render ring
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831101] [drm] stuck
on bsd ring
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831102] [drm] stuck
on blitter ring
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831104] [drm] stuck
on video enhancement ring
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831601] [drm] GPU
HANG: ecode 9:0:0x85d7fffb, in gem_concurrent_ [4417], reason: Ring hung,
action: reset
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831666] [drm] GPU
hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831667] [drm] Please
file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831669] [drm]
drm/i915 developers can then reassign to the right component if it's not a
kernel issue.
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831670] [drm] The gpu
crash dump is required to analyze gpu hangs, so please always attach it.
Aug 14 04:44:18 qa-Skylake-Client-platform kernel: [  235.831671] [drm] GPU
crash dump saved to /sys/class/drm/card0/error
Aug 14 04:44:19 qa-Skylake-Client-platform kernel: [  236.536375]
[drm:gen8_do_reset [i915]] *ERROR* bsd ring: reset request timeout
Aug 14 04:44:19 qa-Skylake-Client-platform kernel: [  236.538521] drm/i915:
Resetting chip after gpu hang
Aug 14 04:44:19 qa-Skylake-Client-platform kernel: [  236.538535]
[drm:i915_reset [i915]] *ERROR* Failed to reset chip: -5

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