[Bug 98355] New: [SNB][drm] GPU HANG: ecode 6:-1:0x00000000, reason: Kicking stuck wait on render ring, action: continue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98355

            Bug ID: 98355
           Summary: [SNB][drm] GPU HANG: ecode 6:-1:0x00000000, reason:
                    Kicking stuck wait on render ring, action: continue
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mariusz.libera at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: SNB
     i915 features: GPU hang

Created attachment 127422
  --> https://bugs.freedesktop.org/attachment.cgi?id=127422&action=edit
cat /sys/class/drm/card0/error | bzip2 > error.bz2

After resuming from suspend instead of KDE's lockscreen I was greeted only by
my wallpaper and mouse cursor (responsive). I switched to another tty (it
worked, I could log in) and back and this time it was only black screen, after
another tty switch xserver crashed. After that I was able to start another X
session.

This is what happened this time, but honestly I can't use my laptop for 2 days
without experiencing, at best, freezing of my desktop for a few seconds or, at
worst, forcing me to reboot using sysrq. I can't reliably reproduce it, seems
to happen at random, and may not always be a "GPU Hang", I also saw messages
like:
WARNING: CPU: 0 PID: 500 at drivers/gpu/drm/i915/intel_display.c:3857
intel_atomic_commit+0x1459/0x1460 [i915]
Removing stuck page flip
followed by a backtrace, but was too lazy to report.


Archlinux x86_64
Kernel 4.8.2
Mesa 12.0.3
Xserver 1.18.4

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