[Bug 68299] New: [ILK/SNB/IVB Bisected]igt/gem_concurrent_blit/cpu-gpu-read-after-write segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68299

          Priority: high
            Bug ID: 68299
          Assignee: daniel at ffwll.ch
           Summary: [ILK/SNB/IVB
                    Bisected]igt/gem_concurrent_blit/cpu-gpu-read-after-wr
                    ite segfault
        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: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 84299
  --> https://bugs.freedesktop.org/attachment.cgi?id=84299&action=edit
dmesg

System Environment:
--------------------------
Platform:    Ironlake/Sandybridge/Ivybridge
Kernel:      (drm-intel-fixes)2156b612b7589caf39eded17545fa6b77e072f10

Bug detailed description:
-----------------------------
It segfault on Ironlake/Sandybridge/Ivybridge with -nightly,-queued and -fixes
kernel.
Following cases also segfault:
igt/gem_concurrent_blit/cpu-gpu-read-after-write-interruptible    
igt/gem_concurrent_blit/gtt-gpu-read-after-write    
igt/gem_concurrent_blit/gtt-gpu-read-after-write-interruptible    
igt/gem_concurrent_blit/prw-gpu-read-after-write    
igt/gem_concurrent_blit/prw-gpu-read-after-write-interruptible    

bisect shows:78865847f9fae7e590960f9836f2ec8b611a190e is the first bad commit
commit 78865847f9fae7e590960f9836f2ec8b611a190e
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Mon Aug 19 07:23:49 2013 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon Aug 19 08:09:25 2013 +0200

    lib/drmtest: skip fixtures after an igt_skip

    This way we can just enclose all igt_skip/igt_require calls into
    fixtures even when we have subtests, and still output correct SKIP
    message for all of them. Wohoo, magic!

    The only thing which doesn't work yet is enumerating failed subtests,
    but I think that should work out on top of this.

    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


output:
Segmentation fault (core dumped)

Reproduce steps:
----------------------------
1. ./gem_concurrent_blit --run-subtest cpu-gpu-read-after-write

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