[Bug 89060] [BSW]igt/gem_ring_sync_loop causes GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89060

--- Comment #2 from ye.tian <yex.tian at intel.com> ---
Tested it on the latest fixes kernel(39a880) and lgt (gbeddb3b), this issue
still fails.

output:
-------------
root at x-bsw01:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_ring_sync_loop      IGT-Version: 1.10-gbeddb3b (x86_64) (Linux:
4.0.0_drm-intel-fixes_39a880_20150414+ x86_64)
Test assertion failure function intel_batchbuffer_flush_on_ring, file
intel_batchbuffer.     c:183:
Failed assertion: (drm_intel_gem_bo_context_exec(batch->bo, ctx, used, ring))
== 0
Last errno: 5, Input/output error
Stack trace:
  #0 [__igt_fail_assert+0xf1]
  #1 [intel_batchbuffer_flush_on_ring+0xc5]
  #2 [main+0x19a]
  #3 [__libc_start_main+0xf5]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Test gem_ring_sync_loop failed.
**** DEBUG ****
(gem_ring_sync_loop:4435) drmtest-DEBUG: Test requirement passed: fd >= 0
Test requirement passed: HAS_BLT_RING(intel_get_drm_devid(fd))
Test assertion failure function intel_batchbuffer_flush_on_ring, file
intel_batchbuffer.     c:183:
Failed assertion: (drm_intel_gem_bo_context_exec(batch->bo, ctx, used, ring))
== 0
Last errno: 5, Input/output error
****  END  ****
FAIL (11.640s)

real    0m17.722s
user    0m0.247s
sys     0m1.099s

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