[Bug 88908] New: [BYT bisected]igt/gem_reloc_vs_gpu/forked-thrashing-hang cause system hang.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88908

            Bug ID: 88908
           Summary: [BYT
                    bisected]igt/gem_reloc_vs_gpu/forked-thrashing-hang
                    cause system hang.
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113031
  --> https://bugs.freedesktop.org/attachment.cgi?id=113031&action=edit
dmesg after run forked-thrashing-hang

==System Environment==
--------------------------
Regression: Yes.
Non-working platforms:  BYT

==kernel==
--------------------------
drm-intel-nightly/8b4216f91c7bf8d3459cadf9480116220bd6545e(2015-02-02)

==Bug detailed description==
-----------------------------
System hang a while after running this case, I can see alot of abnormal output
in dmesg before it hang.
igt/gem_reloc_vs_gpu/forked-faulting-reloc-thrashing-hang
igt/gem_reloc_vs_gpu/forked-faulting-reloc-thrash-inactive-hang 
igt/gem_reloc_vs_gpu/forked-thrash-inactive-hang
igt/gem_reloc_vs_gpu/forked-thrashing-hang


[root at x-bdw01 tests]# time ./gem_reloc_vs_gpu --run-subtest
forked-faulting-reloc-thrash-inactive-hang
IGT-Version: 1.9-g3214a27 (x86_64) (Linux:
3.19.0-rc4_drm-intel-nightly_95cce4_20150115+ x86_64)
^C^

==Reproduce steps==
---------------------------- 
1. ./gem_reloc_vs_gpu --run-subtest forked-faulting-reloc-thrash-inactive-hang

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