[Bug 79571] New: [Regression][radeon] Using Weston while playing video on X with VDPAU in background causes kernel panic.

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https://bugzilla.kernel.org/show_bug.cgi?id=79571

            Bug ID: 79571
           Summary: [Regression][radeon] Using Weston while playing video
                    on X with VDPAU in background causes kernel panic.
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15.3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: marcel132132@gmail.com
        Regression: No

Created attachment 142211
  --> https://bugzilla.kernel.org/attachment.cgi?id=142211&action=edit
Kernel panic at its best

Title explains everything. It was working correctly on 3.15.2. Both kernels
were compiled with GCC 4.8.2 (Ubuntu 4.8.2-19ubuntu1). 

Steps to reproduce:
1. Start X
2. mplayer -vo vdpau -vc ffh264vdpau "[path to any 1920x1080 H.264 video]"
3. Switch to TTY1
4. weston-launch
5. Start Weston terminal.
6. Wait 10-20 seconds and start moving terminal's window.

Expected result: We see a moving window.
Actual result: We see a moving stack trace

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