[Bug 85672] New: [BYT]igt/gem_cpu_reloc sporadically fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85672

            Bug ID: 85672
           Summary: [BYT]igt/gem_cpu_reloc sporadically fails
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: not sure
Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/bd21cf795cf5dc278f1451d0f7a597cb1d13c2ba

==Bug detailed description==
It fails once when run 5 cycles with -nightly kernel.

output:
IGT-Version: 1.8-gcba3088 (x86_64) (Linux:
3.18.0-rc2_drm-intel-nightly_bd21cf_20141030+ x86_64)
gem_cpu_reloc:  44%Test assertion failure function exec, file
gem_cpu_reloc.c:120:
Failed assertion: (drmIoctl(fd, (((1U) << (((0+8)+8)+14)) | ((('d')) << (0+8))
| (((0x40 + 0x29)) << 0) | ((((sizeof(struct drm_i915_gem_execbuffer2)))) <<
((0+8)+8))), &execbuf)) == 0
Last errno: 22, Invalid argument

==Reproduce steps==
---------------------------- 
1. ./gem_cpu_reloc

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