[Bug 68830] New: [Bisected]igt/gem_concurrent_blit/cpu-early-read-forked fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68830

          Priority: high
            Bug ID: 68830
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: daniel at ffwll.ch
           Summary: [Bisected]igt/gem_concurrent_blit/cpu-early-read-forke
                    d fails
        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 85036
  --> https://bugs.freedesktop.org/attachment.cgi?id=85036&action=edit
dmesg

System Environment:
--------------------------
Platform:  PNV/ILK/SNB/IVB/HSW
Kernel:    (drm-intel-nightly)4508e539b642ff40ad57f3ab7721ed2862da2eb5

Bug detailed description:
-----------------------------
It fails on PNV/ILK/SNB/IVB/HSW.It happens on drm-intel-nightly,
drm-intel-next-queued, drm-intel-fixes kernel.
Following cases also fail:
igt/gem_concurrent_blit/cpu-gpu-read-after-write-forked    
igt/gem_concurrent_blit/cpu-overwrite-source-forked    
igt/gem_concurrent_blit/gtt-early-read-forked    
igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked    
igt/gem_concurrent_blit/gtt-overwrite-source-forked    
igt/gem_concurrent_blit/prw-early-read-forked    
igt/gem_concurrent_blit/prw-gpu-read-after-write-forked    
igt/gem_concurrent_blit/prw-overwrite-source-forked

Bisect shows:cd1f220847c34610ab9e07c3cf1c5a7e77284eb8 is the first bad commit
commit cd1f220847c34610ab9e07c3cf1c5a7e77284eb8
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Thu Aug 29 10:06:51 2013 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Thu Aug 29 18:18:33 2013 +0200

    lib/drmtest: extract igt_fork from gem_concurrent_blt

    Making sure that we correctly collect the exit codes from all children
    is a bit a hassle. So add another magic igt codeblock for easy forking
    and joining.

    Note that children are (currently at least) not allowed to call igt_skip.
    Add an assert to enforce this.

    v2:
    - Properly propagate the exit code.
    - Fix the segfault.
    - Add a child int and num_children paramter to the magic codeblock as
      suggested by Chris Wilson.
    - Don't dump noise into stdout when a child thread fails, the parent
      will do that for us already.

    v3: Now with some docs.

    v4: Fixup igt_waitchildren to properly reset state so it can be used
    again.

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


output:
Subtest cpu-early-read-forked: FAIL

Reproduce steps:
----------------------------
1. ./gem_concurrent_blit --run-subtest cpu-early-read-forked

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