[Bug 81731] New: [BSW Regression]igt/gem_tiled_blits/interruptible causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81731

          Priority: high
            Bug ID: 81731
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BSW Regression]igt/gem_tiled_blits/interruptible
                    causes system hang
        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: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103424
  --> https://bugs.freedesktop.org/attachment.cgi?id=103424&action=edit
dmesg on fixes branch

==System Environment==
--------------------------
Regression: Yes

Good commit on -next-queued: 91565c85b66db820f01894a971d39aaef60c4325

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: 089bea2664988de48fccc81407ebe12115156731(fails)
    drm-intel-nightly: 2014y-07m-24d-09h-55m-38s integration manifest
origin/drm-intel-next-queued: 2b8ee5710915a244b807fbe3427299d007d19e89(works)
    drm/i915: Allow overlapping userptr objects  
origin/drm-intel-fixes: eedd10f45bdcb2a5b2afa35f845e080c3bc984f2(CallTrace
while running the test, please check attachment)
    drm/i915: Simplify i915_gem_release_all_mmaps()

==Bug detailed description==
-----------------------------
igt/gem_tiled_blits/interruptible causes system hang

Unable get dmesg because system hang.

Output:
[root at x-bsw01 tests]#  ./gem_tiled_blits --run-subtest interruptible
IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_089bea_20140725_debug+ x86_64)
not enough RAM to run test, reducing buffer count
Using 1719 1MiB buffers
Verifying initialisation...



Reproduce steps:
-------------------------
1. ./gem_tiled_blits --run-subtest interruptible

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