[Bug 88938] New: Xorg hangs when switching windows with composition enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88938

            Bug ID: 88938
           Summary: Xorg hangs when switching windows with composition
                    enabled
           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: rnovacek at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm using KDE Plasma 5 desktop with compositing enabled (Rendering backend
OpenGL 3.1, EGL OpenGL interface). Sometimes (~ once an hour) whole Xorg
freezes when switching windows via alt+tab.

This appears in the dmesg:
[  703.460565] [drm] stuck on render ring
[  703.461616] [drm] GPU HANG: ecode 0:0x00200000, in Xorg.bin [1414], reason:
Ring hung, action: reset
[  703.461619] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  703.461621] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  703.461622] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  703.461623] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  703.461625] [drm] GPU crash dump saved to /sys/class/drm/card0/error

Dump of /sys/class/drm/card0/error is here:
https://rnovacek.fedorapeople.org/grfx-crash.log

I'm using Fedora 21 with following packages:
xorg-x11-server-Xorg-1.16.2.901-1.fc21.x86_64
xorg-x11-drv-intel-2.99.916-3.20141117.fc21.x86_64
mesa-dri-drivers-10.4.2-1.20150112.fc21.x86_64

Let me know if I can provide some additional information.

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