[Bug 112377] New: [TGL] media VME encoding GPU hang w/o i915 error state captured

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112377

            Bug ID: 112377
           Summary: [TGL] media VME encoding GPU hang w/o i915 error state
                    captured
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dmitry.v.rogozhkin at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 146016
  --> https://bugs.freedesktop.org/attachment.cgi?id=146016&action=edit
Full dmesg log

>From https://github.com/intel/media-driver/issues/773

Run:
wget https://fate-suite.libav.org/h264-conformance/AUD_MW_E.264
sample_multi_transcode -i::h264 AUD_MW_E.264 -hw -async 1 -u 4 -o::h264 a.h264

Stack:
*
https://github.com/intel/gmmlib/commit/f78be970a6c3aef6d0347159f9c3f250421af16c
*
https://github.com/intel/media-driver/commit/1645d0f06597599393625168cc4445b0ae092219
*
https://github.com/Intel-Media-SDK/MediaSDK/commit/2515d8fbb65979685ce086aa5c9b24786cc2cab6
+ apply https://github.com/Intel-Media-SDK/MediaSDK/pull/1771

Ran with latest drm-tip kernel:
commit 5bbbc0061acc528705e593d7e01c4c9c40b208db
Merge: e67c139 883d955
Author: Lyude Paul <lyude at redhat.com>
Date:   Fri Nov 22 14:12:54 2019 -0500

    Merge remote-tracking branch 'drm-intel/topic/core-for-CI' into drm-tip


Essential part of dmesg (full one attached with drm.debug=0x1e):
[   77.006161] i915 0000:00:02.0: Resetting rcs0 for preemption time out
[   77.006204] i915 0000:00:02.0: sample_multi_tr[1951] context reset due to
GPU hang
[   77.006293] [drm:__i915_request_reset [i915]] client sample_multi_tr[1951]:
gained 1 ban score, now 1

i915 error state: EMPTY


Can you, please, help debug the issue from kmd stand point?

Why i915 error state is missing? is it real GPU hang or i915 bug?

Note: the above media encoder works on RCS and VCS rings, VCS tasks depend on
RCS ones.

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