[Bug 72104] New: [BDW]igt/gem_pipe_control_store_loop causes gpu hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72104

          Priority: medium
            Bug ID: 72104
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]igt/gem_pipe_control_store_loop causes gpu hangs
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 89949
  --> https://bugs.freedesktop.org/attachment.cgi?id=89949&action=edit
dmesg

System Environment:
--------------------------
Platform: Broadwell
kernel   (drm-intel-nexe-queued)8b4f49e03901e82898540bd1189333edf9588d74
Some additional commit info:
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Mon Nov 25 15:51:16 2013 -0800

    drm/i915: split fb allocation and initialization v2

    If we use a stolen buffer, our probe callback shouldn't allocate a new
    buffer; we should re-use the one from the BIOS instead if possible.

    v2: fix locking (Jesse)

Bug detailed description:
-----------------------------
Igt/gem_pipe_control_store_loop causes gpu hangs, and the os unable to reboot.

This is the first time to run igt test on Broadwell.

Error log:
[  531.524816] [drm] stuck on render ring
[  531.524864] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  531.524928] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  531.525026] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  531.525109] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  531.525201] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
Steps:
---------------------------
./gem_pipe_control_store_loop

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