Crash while working within Unity or Mumble

[David Barth]

Binary package hint: xserver-xorg-video-ati

Not sure if Unity/Compiz is pushing the driver to its limits or whether Mumble is doing something really bad.
But i got this crasher twice today, when using the 3 of those components together. I don't have a reproducible way of triggering the crash though.

Here is what I found in the logs:

Backtrace:
[ 26243.638] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[ 26243.639] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8]
[ 26243.639] 2: /lib/i386-linux-gnu/libpthread.so.0 (0xc1a000+0xe9e0) [0xc289e0]
[ 26243.639] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e]
[ 26243.639] 4: /usr/bin/X (WriteToClient+0x267) [0x80a7607]
[ 26243.639] 5: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x62) [0x4bebf2]
[ 26243.639] 6: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x75) [0x4bcfc5]
[ 26243.639] 7: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x8c7000+0xce17c) [0x99517c]
[ 26243.639] 8: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x8c7000+0xd1f12) [0x998f12]
[ 26243.639] 9: /lib/i386-linux-gnu/libdrm.so.2 (drmHandleEvent+0xf5) [0x8c4665]
[ 26243.639] 10: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x8c7000+0xd1e2f) [0x998e2f]
[ 26243.639] 11: /usr/bin/X (WakeupHandler+0x52) [0x8074602]
[ 26243.639] 12: /usr/bin/X (WaitForSomething+0x1ba) [0x80a1f3a]
[ 26243.639] 13: /usr/bin/X (0x8048000+0x27f1e) [0x806ff1e]
[ 26243.639] 14: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
[ 26243.639] 15: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x192e37]
[ 26243.639] 16: /usr/bin/X (0x8048000+0x1a411) [0x8062411]
[ 26243.639] Segmentation fault at address 0xb5a5f008
[ 26243.639]
Caught signal 11 (Segmentation fault). Server aborting