[Bug 68635] New: [HSW]igt/gem_seqno_wrap randomly fails and causes *ERROR* no progress on bsd ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68635

          Priority: medium
            Bug ID: 68635
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]igt/gem_seqno_wrap randomly fails and causes
                    *ERROR* no progress on bsd ring
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 84767
  --> https://bugs.freedesktop.org/attachment.cgi?id=84767&action=edit
dmesg

System Environment:
--------------------------
Platform:  Haswell
Kernel:    (drm-intel-fixes)2e6efddd203c15ca5c4700511f717c0e9a3ea31a

Bug detailed description:
-----------------------------
It randomly fail and causes [drm:i915_hangcheck_elapsed] *ERROR* no progress on
bsd ring. It happens 3 in 5 runs with -fixes kernel. It doesn't happen on
-nightly and -queued kernel.

output:
Test assertion failure function random_run_once, file gem_seqno_wrap.c:518:
Failed assertion: write_seqno(val) == 0

Reproduce steps:
----------------------------
1. ./gem_seqno_wrap

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