[Bug 74100] New: [SNB Bisected]igt/gem_reset_stats/close-pending-fork-render causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74100

          Priority: high
            Bug ID: 74100
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: mika.kuoppala at intel.com
           Summary: [SNB
                    Bisected]igt/gem_reset_stats/close-pending-fork-render
                    causes system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 92828
  --> https://bugs.freedesktop.org/attachment.cgi?id=92828&action=edit
dmesg

System Environment:
--------------------------
Platform: Sandybridge
Kernel(drm-intel-nightly)f27f16540be56813df2ebb8e1106dd5c258f07c3

Bug detailed description:
-------------------------
It causes system hang on sandybridge with -nightly, -queued and -fixes kernel.

Bsiect shows: igt commit c05c88c2b641aaab83608fb2c8e816893690c1fe is the first
bad commit.
commit c05c88c2b641aaab83608fb2c8e816893690c1fe
Author:     Mika Kuoppala <mika.kuoppala at linux.intel.com>
AuthorDate: Tue Jan 21 17:40:08 2014 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Jan 22 09:45:27 2014 +0100

    tests/gem_reset_stats: stop only one ring when submitting hang

    If we stop all the rings, we can end up blaming the innocent
    rings on hangcheck.

    Reference: https://bugs.freedesktop.org/show_bug.cgi?id=73652
    Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

output:
IGT-Version: 1.5-gb5109e6 (x86_64) (Linux:
3.13.0-rc8_drm-intel-nightly_f27f16_20140126+ x86_64)
Subtest close-pending-fork-render: SUCCESS
Test requirement not met in function gem_require_ring, file
./../lib/drmtest.h:311:
Last errno: 11, Resource temporarily unavailable
Test requirement: (!(gem_has_vebox(fd)))
Subtest reset-stats-vebox: SKIP
Subtest reset-stats-ctx-vebox: SKIP
Subtest ban-vebox: SKIP
Subtest ban-ctx-vebox: SKIP
Subtest reset-count-vebox: SKIP
Subtest reset-count-ctx-vebox: SKIP
Subtest unrelated-ctx-vebox: SKIP
Subtest close-pending-vebox: SKIP
Subtest close-pending-ctx-vebox: SKIP
Subtest close-pending-fork-vebox: SKIP

Reproduce steps:
-------------------------
1. ./gem_reset_stats --run-subtest close-pending-fork-render

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