[Bug 76304] New: [BDW Regression]igt/gem_dummy_reloc_loop/blt causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76304

          Priority: high
            Bug ID: 76304
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]igt/gem_dummy_reloc_loop/blt causes
                    [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
                    elapsed... blitter ring idle
        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 95982
  --> https://bugs.freedesktop.org/attachment.cgi?id=95982&action=edit
dmesg

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

Bug detailed description:
------------------------- 
run ./gem_dummy_reloc_loop --run-subtest blt, report <3>[  410.576752]
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring
idle.
It happens on Broadwell with -nightly and -queued kernel.
igt/gem_dummy_reloc_loop/mixed also has this error.

The latest known good commit: b6ae3c7c60161a9b1e15b1ccd6412fad65b7d9cf
The latest known bad commit: b2040f6fed736ccd2319768bc59833abe74148b8

output:
IGT-Version: 1.6-g10571b8 (x86_64) (Linux:
3.14.0-rc6_drm-intel-nightly_b18596_20140314+ x86_64)
running dummy loop on blt
dummy loop run on blt completed
Subtest blt: SUCCESS

Reproduce steps:
---------------------------- 
1. ./gem_dummy_reloc_loop --run-subtest blt

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