[Bug 99942] New: [APL] GPU Hang during transcoding video

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99942

            Bug ID: 99942
           Summary: [APL] GPU Hang during transcoding video
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: edwardtseng at qnap.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 129895
  --> https://bugs.freedesktop.org/attachment.cgi?id=129895&action=edit
dump from /sys/class/drm/card0/error

Hi:
While transcoding HEVC 10bit video to H264, the GPU may hang there.
It can recover from the status only if the device reboots.
The Kernel message is as follow:
[  973.709462] [drm] GPU HANG: ecode 9:4:0xacdfbffd, in ffmpeg [6992], reason:
Hang on video enhancement ring, action: reset
[  973.720436] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  973.729630] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  973.738477] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  973.748085] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  973.757000] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  973.764295] drm/i915: Resetting chip after gpu hang
[  973.769821] [drm] GuC firmware load skipped
[  983.766780] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[  993.780258] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1003.792770] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1013.805246] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1023.817750] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1024.719067] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1033.830242] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1034.731572] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete
[ 1043.843737] [drm:i915_gem_wait_for_error.part.38] *ERROR* Timed out waiting
for the gpu reset to complete

dump from /sys/class/drm/card0/error:
GPU HANG: ecode 9:4:0xacdfbffd, in ffmpeg [6992], reason: Hang on video
enhancement ring, action: reset
Time: 1487838143 s 4506 us
Kernel: 4.2.8
Active process (on ring vebox): ffmpeg [6992]
Reset count: 0
Suspend count: 0
PCI ID: 0x5a85
PCI Revision: 0x0b
PCI Subsystem: 8086:2112
IOMMU enabled?: 0
DMC loaded: yes
DMC fw version: 1.7
EIR: 0x00000000
IER: 0x08000000
GTIER gt 0: 0x01010101
GTIER gt 1: 0x01010101
GTIER gt 2: 0x00000070
GTIER gt 3: 0x00000101
PGTBL_ER: 0x00000000
FORCEWAKE: 0xffff0001
DERRMR: 0x2077efef
CCID: 0x00000000
Missed interrupts: 0x00000000

CPU: Intel(R) Celeron(R) CPU J3455 @ 1.50GHz
Git src tag: drm-intel-testing-2016-07-25
Please advise.
Thank you!
Cheers,
Edward Tseng

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