[Bug 79237] New: [SNB/BDW bisected]igt/gem_userptr_blits fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79237

          Priority: high
            Bug ID: 79237
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB/BDW bisected]igt/gem_userptr_blits fails
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 99819
  --> https://bugs.freedesktop.org/attachment.cgi?id=99819&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
It's a igt regression issue, the result before was skipped

Non-working platforms: SNB BDW

==kernel==
--------------------------
origin/drm-intel-nightly: c37f30ddc2921eccbf0be87c7742b56fbde53a81(fails)
    drm-intel-nightly: 2014y-05m-23d-13h-57m-55s integration manifest
origin/drm-intel-next-queued: f83d6518a13020e3cf7abbcc6b4e6d34459d9a9f(fails)
    ddrm/i915: Kill private_default_ctx off    
origin/drm-intel-fixes: c1240bd2842f6ec26d7dc1d9c845a197a41d33fe(skips)
    drm/i915: Prevent negative relocation deltas from wrapping

==Bug detailed description==
-----------------------------
igt/gem_userptr_blits fails

Output:
 ./gem_userptr_blits
IGT-Version: 1.6-gff3c122 (x86_64) (Linux:
3.15.0-rc3_drm-intel-next-queued_f83d65_20140525+ x86_64)
Aperture size is 4096 MiB
Total RAM is 3865 MiB
Subtest input-checking: SUCCESS
Subtest usage-restrictions: SUCCESS
Subtest invalid-mapping: SUCCESS
Subtest forbidden-operations: SUCCESS
Testing unsynchronized mappings...
Subtest create-destroy-unsync: SUCCESS
Subtest unsync-overlap: SUCCESS
Subtest unsync-unmap: SUCCESS
Subtest unsync-unmap-cycles: SUCCESS
Subtest unsync-unmap-after-close: SUCCESS
Using 2x2730 1MiB buffers
Verifying initialisation...
Cyclic blits cpu->gpu, forward...
Cyclic blits gpu->cpu, backward...
Random blits...
Subtest coherency-unsync: SUCCESS
gem_userptr_blits: gem_userptr_blits.c:650: sigbus: Assertion `0' failed.
Aborted

==Reproduce steps==
---------------------------- 
1.  ./gem_userptr_blits


==Bisect results==
----------------------------
commit 9911f3f0cf202444f1ef2399f5961605880b7360
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Thu May 22 10:20:33 2014 +0100
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Thu May 22 10:22:04 2014 +0100

    igt/gem_userptr_blits: Fix up last minute API changes

    When the patch was merged, the ioctl numbers had to be adjusted to leave
    no holes. Also there was a final piece of munging of the API to
    downgrade unsynced userptr for export over dma-buf.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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