[Bug 68170] New: [ILK]igt/gem_dummy_reloc_loop/mixed causes [drm:i915_hangcheck_elapsed] *ERROR* stuck on bsd ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68170

          Priority: medium
            Bug ID: 68170
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [ILK]igt/gem_dummy_reloc_loop/mixed causes
                    [drm:i915_hangcheck_elapsed] *ERROR* stuck on bsd ring
        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 84119
  --> https://bugs.freedesktop.org/attachment.cgi?id=84119&action=edit
dmesg

System Environment:
--------------------------
Platform:    Ironlake
Kernel:      (drm-intel-nightly)d93f59e86ae93066969fa8ae2a6c9ccc7fc4728d

Bug detailed description:
-----------------------------
It causes [drm:i915_hangcheck_elapsed] *ERROR* stuck on bsd ring on ironlake
with -queued,-fixed,-nightly kernel. It's a new igt case.
igt/gem_dummy_reloc_loop/bsd also has this issue.

output:
running dummy loop on random rings

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

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