[Bug 103228] New: GPU hang in compute shader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103228

            Bug ID: 103228
           Summary: GPU hang in compute shader
           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: sgunderson at bigfoot.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 134798
  --> https://bugs.freedesktop.org/attachment.cgi?id=134798&action=edit
GPU hang log

Hi,

I'm developing a compression system through compute shaders. The first shader
now works fine, but after adding a second shader (even if it's got an empty
main()), I've started getting GPU hangs:

[2557115.719316] [drm] GPU HANG: ecode 7:0:0x8fd8ffff, in narabu-encoder
[11429], reason: Hang on rcs0, action: reset
[2557115.719318] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[2557115.719319] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[2557115.719320] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[2557115.719321] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[2557115.719321] [drm] GPU crash dump saved to /sys/class/drm/card0/error

This is a Haswell laptop (Lenovo X240), Mesa 17.2.2, kernel 4.13.0. Attached is
a gzipped crash dump (error.gz). My current code is available at

  https://storage.sesse.net/haswell-gpu-hang.tar.xz

Make narabu-encoder and run it; it hangs the GPU nearly every time for me,
adding 125 ms or so to the measured runtime.

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