[Bug 84207] New: [all Regression]igt/gem_render_copy_redux sporadically cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84207

          Priority: high
            Bug ID: 84207
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [all Regression]igt/gem_render_copy_redux sporadically
                    cause system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 106699
  --> https://bugs.freedesktop.org/attachment.cgi?id=106699&action=edit
dmesg

System Environment:
--------------------------
Platform: IVB
Kernel:   (drm-intel-nightly)c5660b4ad395f1e34eacc22cf81c687edfc9c83c

Bug detailed description:
---------------------------
It sporadically cause system hang, fail rate: 2/3.
It happens on -queued, -fixes and -nightly kernel.

Run 10 cycles on -queued branch commit
6e47e3f097cc6c4cb470a805a3fa07a8e8376dab, it works well.

good commit: 6e47e3f097cc6c4cb470a805a3fa07a8e8376dab
bad commit:  b680c37a4d145cf4d8f2b24e46b1163e5ceb1d35

output:
IGT-Version: 1.8-g4b81e9c (x86_64) (Linux:
3.17.0-rc5_drm-intel-nightly_c5660b_20140922_debug+ x86_64)
Subtest normal: SUCCESS (0.218s)
Subtest interruptible: SUCCESS (0.202s)
Subtest flink: SUCCESS (0.817s)
Subtest flink-interruptible: SUCCESS (0.646s)

Reproduce steps:
-------------------------
1. xinit
2. run ./gem_render_copy_redux 3 cycles.

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