[Bug 89681] New: X segfaults when switching virtual desktops of KDE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89681

            Bug ID: 89681
           Summary: X segfaults when switching virtual desktops of KDE
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: johannes.hirte at datenkhaos.de
        QA Contact: xorg-team at lists.x.org

since commit 6c3a721cde9317233072b573f9502348dcd21b16 of xf86-video-ati X
segfaults when switching virtual desktops of KDE. I can reproduce this easily
by playing a video on one vt in fullscreen and switching the desktops then back
and forth. 

Xorg.log shows the this:

[   258.612] (WW) RADEON(0): flip queue failed: Device or resource busy
[   258.612] (EE)
[   258.612] (EE) Backtrace:
[   258.613] (EE) 0: /usr/bin/X (OsLookupColor+0x149) [0x59c049]
[   258.614] (EE) 1: /lib64/libc.so.6 (killpg+0x50) [0x7f20a4e7607f]
[   258.614] (EE) 2: /usr/lib64/libxcb.so.1 (_init+0x3e73e) [0x7f20a3d5dcfe]
[   258.614] (EE) 3: /usr/lib64/libxcb.so.1 (_init+0x3b5c4) [0x7f20a3d57a04]
[   258.615] (EE) 4: /usr/lib64/libxcb.so.1 (_init+0x42d14) [0x7f20a3d665f4]
[   258.615] (EE) 5: /usr/lib64/libxcb.so.1 (_init+0x3a5ba) [0x7f20a3d556ba]
[   258.615] (EE) 6: /usr/lib64/libxcb.so.1 (_init+0x3b64b) [0x7f20a3d57acb]
[   258.616] (EE) 7: /usr/lib64/libdrm.so.2 (drmHandleEvent+0x76)
[0x7f20a6154436]
[   258.616] (EE) 8: /usr/bin/X (WakeupHandler+0x6b) [0x43f1eb]
[   258.617] (EE) 9: /usr/bin/X (WaitForSomething+0x1c3) [0x594d83]
[   258.617] (EE) 10: /usr/bin/X (SendErrorToClient+0x111) [0x43a1f1]
[   258.617] (EE) 11: /usr/bin/X (remove_fs_handlers+0x435) [0x43e675]
[   258.618] (EE) 12: /lib64/libc.so.6 (__libc_start_main+0xf0)
[0x7f20a4e61fd0]
[   258.618] (EE) 13: /usr/bin/X (_start+0x29) [0x42826e]
[   258.619] (EE) 14: ? (?+0x29) [0x29]
[   258.619] (EE)
[   258.619] (EE) Segmentation fault at address 0x0
[   258.619] (EE)
Fatal server error:
[   258.619] (EE) Caught signal 11 (Segmentation fault). Server aborting
[   258.619] (EE)
[   258.619] (EE)

hardware is a Mobility Radeon HD5470

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