[Bug 85354] New: [BYT/BSW]igt/gem_userptr_blits/dmabuf-sync Bus error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85354

            Bug ID: 85354
           Summary: [BYT/BSW]igt/gem_userptr_blits/dmabuf-sync Bus error
           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

Created attachment 108277
  --> https://bugs.freedesktop.org/attachment.cgi?id=108277&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BYT BSW

==kernel==
--------------------------
drm-intel-nightly/77683b77aa4da6e1788838dad2d2a15b0dfc290b

==Bug detailed description==
-----------------------------
gem_userptr_blits subcases dmabuf-sync and dmabuf-unsync causes bus error.

output:
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.18.0-rc1_drm-intel-nightly_77683b_20141023+ x86_64)
Aperture size is 2048 MiB
Total RAM is 3837 MiB
Testing unsynchronized mappings...
Testing synchronized mappings...
Bus error (core dumped)

==Reproduce steps==
---------------------------- 
1. ./gem_userptr_blits --run-subtest dmabuf-sync

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