[Bug 78681] [ILK regression]igt/gem_ring_sync_copy randomly causes *ERROR* Hangcheck timer elapsed... bsd ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78681

--- Comment #7 from lu hua <huax.lu at intel.com> ---
We found many igt cases randomly have this error <3>[   78.814855]
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... bsd ring idle

Run core_getclient
[root at x-pk1 tests]# ./core_getclient
IGT-Version: 1.7-g27d37a1 (x86_64) (Linux:
3.15.0-rc8_drm-intel-fixes_ce9557_20140612+ x86_64)
[root at x-pk1 tests]# dmesg -r | egrep "<[1-3]>" |grep drm
[root at x-pk1 tests]# ./core_getclient
IGT-Version: 1.7-g27d37a1 (x86_64) (Linux:
3.15.0-rc8_drm-intel-fixes_ce9557_20140612+ x86_64)
[root at x-pk1 tests]# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[  222.829544] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
elapsed... bsd ring idle

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