[Bug 85327] New: GPU hang on HSW Celeron when doing 16 VA-API decodes and compositing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85327

            Bug ID: 85327
           Summary: GPU hang on HSW Celeron when doing 16 VA-API decodes
                    and compositing
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: simon at farnz.org.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm using the kernel described in bug 83677 - basically #requests backported to
3.17.0. This may turn out to be a duplicate of that bug.

While it's now harder to get a GPU hang, I've had one with lots of VA-API video
decodes. dmesg gives:

[ 2327.073906] [drm] stuck on render ring
[ 2327.082270] [drm] GPU HANG: ecode 0:0x8fdffff8, in screen_manager [903],
reason: Ring hung, action: reset
[ 2327.082273] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 2327.082274] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 2327.082275] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 2327.082276] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 2327.082277] [drm] GPU crash dump saved to /sys/class/drm/card0/error

I'll attach the gzip'd error state.

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