[Bug 88655] New: [BSW Regression]igt/gem_pread_after_blit/default-hang causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88655

            Bug ID: 88655
           Summary: [BSW Regression]igt/gem_pread_after_blit/default-hang
                    causes system hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         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 112589
  --> https://bugs.freedesktop.org/attachment.cgi?id=112589&action=edit
dmesg

==System Environment==
--------------------------
Regression: yes
good commit: 1d83d957e621f160dfe0f08194e9c2fdd5fa7f3e
bad commit: 93180785d44e3d417099e293b9ff6eeb4fd20aa2

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/d6bc7a6a0a7573350e8be8ec54002c20d1dbe1e0
commit d6bc7a6a0a7573350e8be8ec54002c20d1dbe1e0
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Jan 20 15:10:59 2015 +0100

    drm-intel-nightly: 2015y-01m-20d-14h-10m-40s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes system on drm-intel-nightly and drm-intel-next-queued kernel.

output
IGT-Version: 1.9-g032f30c (x86_64) (Linux:
3.19.0-rc4_drm-intel-nightly_d6bc7a_20150121+ x86_64)

==Reproduce steps==
---------------------------- 
1. ./gem_pread_after_blit --run-subtest default-hang

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