[Bug 76306] New: [BDW Regression]igt/gem_reloc_vs_gpu/forked-faulting-reloc fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76306

          Priority: medium
            Bug ID: 76306
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW
                    Regression]igt/gem_reloc_vs_gpu/forked-faulting-reloc
                    fails
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 95988
  --> https://bugs.freedesktop.org/attachment.cgi?id=95988&action=edit
dmesg

System Environment:
--------------------------
Platform: Broadwell
kernel: (drm-intel-nightly)b1859622badb7509586987af5269aa525a0c112f

Bug detailed description:
-------------------------
It fails on Broadwell with -nightly kernel, and works well on -fixes, -queued,
drm-next, drm-fixes and core-stuff branch.

It works well on commit: 32faf6da913d67a4a3fcddd810305ec3445ed581(-nightly
branch)

IGT-Version: 1.6-g10571b8 (x86_64) (Linux:
3.14.0-rc6_drm-intel-nightly_b18596_20140314+ x86_64)
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:258:
Last errno: 2, No such file or directory
Failed assertion: test == 0xdeadbeef
mismatch in buffer 11: 0x00000000 instead of 0xdeadbeef
child 12 failed with exit status 99
Subtest forked-faulting-reloc: FAIL
gem_reloc_vs_gpu: igt_core.c:829: children_exit_handler: Assertion `ret == 0'
failed.
Aborted (core dumped)

Reproduce steps:
---------------------------- 
1. ./gem_reloc_vs_gpu --run-subtest forked-faulting-reloc

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