[Bug 102586] System freeze with Kernels > 4.11.x (freeze on 4.12.x and 4.13.x)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102586

--- Comment #19 from jaar at lordsofts.com ---
Created attachment 136065
  --> https://bugs.freedesktop.org/attachment.cgi?id=136065&action=edit
output of /sys/class/drm/card0/error

after a profile update i had to rebuild my system with gcc 6.4 (Gentoo Hardened
6.4.0 p1.1)
after recompiling the complete system i managed to upgraded to kernel 4.14.x
without any gpu-freezes!

maybe the new hardened profile or gcc 6.4 solved the freezes.
since then i had several atomic errors, but no gpu hang!

however, today i had another GPU hang, but unlike the freezes before now
resetting gpu worked and i was able to continue working without any issues.

the application that caused the GPU hang was avidemux3:
https://github.com/mean00/avidemux2.git (./bootStrap.bash --enable-qt4)

the problem may be related to VAAPI as i used avidemux with VAAPI enabled to
cut a x265/HEVC video (fast forward searching in video: continuously PageUp-key
pressed down)

dmesg:
[317920.925145] [drm] GPU HANG: ecode 9:2:0xa8dfbffd, in avidemux3_qt4 [1739],
reason: Hang on vcs0, action: reset
[317920.925148] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[317920.925148] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[317920.925149] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[317920.925150] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[317920.925151] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[317920.925320] i915 0000:00:02.0: Resetting chip after gpu hang
[317920.928295] [drm] RC6 on

crash dump is attached (binary data removed)

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