[Bug 81989] New: [BSW Regression]igt/gem_tiled_partial_pwrite_pread/writes causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81989

          Priority: high
            Bug ID: 81989
          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_partial_pwrite_pread/writes
                    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

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: c79057922ed6c2c6df1214e6ab4414fea1b23db2(skipped)

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: ddbc288690cd888dd6f5629ccba9a2691a70b7b0(fails)
    drm-intel-nightly: 2014y-07m-31d-10h-07m-17s integration manifest
origin/drm-intel-next-queued: 17c58fe801f5588c5904cc2f15620f7f5a465b53(fails)
    drm/i915: Align intel_dsi*.c files a bit
origin/drm-intel-fixes: f4be89cecea437aaddd7700d05c6bdb5678041f7(works)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
igt/gem_tiled_partial_pwrite_pread/writes causes system hang

Output:
[root at x-bsw01 tests]# time ./gem_tiled_partial_pwrite_pread --run-subtest
writes
IGT-Version: 1.7-gde1e877 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_c95053_20140731+ x86_64)
partial writes test:   9%

Unable to get dmesg because system hang

==Reproduce steps==
---------------------------- 
1. ./gem_tiled_partial_pwrite_pread --run-subtest writes

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