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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 89060
           Summary: [BSW]igt/gem_ring_sync_loop causes GPU hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113305
  --> https://bugs.freedesktop.org/attachment.cgi?id=113305&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-next-queued 21076372afe711072b9a447f22a098691dd0b2cb

==Bug detailed description==
-----------------------------
It causes GPU hang on BSW with drm-intel-next-queued kernel. On the
drm-intel-nightly kernel, it has bug 88987, when bisect bug 88987, catch this
issue.

output:
IGT-Version: 1.9-gbef692d (x86_64) (Linux: 3.19.0-rc5_kcloud_210763_20150209+
x86_64)

^C^C^C^C^C^C^C^C^C^C^C^C
real    12m41.468s
user    0m0.009s
sys     0m0.032s

==Reproduce steps==
---------------------------- 
1. ./gem_ring_sync_loop

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