[Bug 88984] New: [BSW]igt/gem_multi_bsd_sync_loop sporadically causes *ERROR* Hangcheck timer elapsed... render ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88984

            Bug ID: 88984
           Summary: [BSW]igt/gem_multi_bsd_sync_loop sporadically causes
                    *ERROR* Hangcheck timer elapsed... render ring idle
           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 113174
  --> https://bugs.freedesktop.org/attachment.cgi?id=113174&action=edit
dmesg

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

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/9583cb470cd82997b5f23d4acab852563f5c0047
commit 9583cb470cd82997b5f23d4acab852563f5c0047
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Feb 4 15:22:12 2015 +0100

    drm-intel-nightly: 2015y-02m-04d-14h-21m-52s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically causes [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck
timer elapsed... render ring idle. fail rate:3/5

==Reproduce steps==
---------------------------- 
1. ./gem_multi_bsd_sync_loop

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