Comment 4 for bug 96127

I've also been using firefox when suddenly Xgl crashed. I had acroread open and was rezooming when it was happening.

dmesg says:

May 17 16:46:34 charlie kernel: [ 5660.019274] ati_remote 5-6.3:1.0: Unknown input from channel 0x07: data f7,7f
May 17 17:31:34 charlie kernel: [ 8353.649574] Xgl[8339]: segfault at aa3d5fcc eip b7df49bc esp bfe4b56c error 4
May 17 17:31:34 charlie kernel: [ 8353.664966] compiz.real[8433]: segfault at 0051952a eip 08055a80 esp bfb5a250 error 4
May 17 17:31:35 charlie kernel: [ 8354.814018] [fglrx] interrupt source 10000000 successfully disabled!
May 17 17:31:35 charlie kernel: [ 8354.814026] [fglrx] enable ID = 0x00000000
May 17 17:31:35 charlie kernel: [ 8354.814031] [fglrx] Receive disable interrupt message with irqEnableMask: 10000000; dwIRQEnableId: 00000005
May 17 17:31:35 charlie kernel: [ 8354.814055] [fglrx] interrupt source 20008000 successfully disabled!
May 17 17:31:35 charlie kernel: [ 8354.814059] [fglrx] enable ID = 0x00000000
May 17 17:31:35 charlie kernel: [ 8354.814062] [fglrx] Receive disable interrupt message with irqEnableMask: 20008000; dwIRQEnableId: 00000004
May 17 17:31:39 charlie kernel: [ 8358.580298] [fglrx] PCIe has already been initialized. Reinitializing ...
May 17 17:31:39 charlie kernel: [ 8358.598503] [fglrx] Reserve Block - 0 offset = 0X7ffb400 length = 0X4c00
May 17 17:31:39 charlie kernel: [ 8358.598510] [fglrx] Reserve Block - 1 offset = 0X0 length = 0X40000
May 17 17:31:39 charlie kernel: [ 8358.598515] [fglrx] Reserve Block - 2 offset = 0X7fbb000 length = 0X40000
May 17 17:31:39 charlie kernel: [ 8358.678098] [fglrx] interrupt source 20008000 successfully enabled
May 17 17:31:39 charlie kernel: [ 8358.678106] [fglrx] enable ID = 0x00000004
May 17 17:31:39 charlie kernel: [ 8358.678116] [fglrx] Receive enable interrupt message with irqEnableMask: 20008000
May 17 17:31:39 charlie kernel: [ 8358.678212] [fglrx] interrupt source 10000000 successfully enabled
May 17 17:31:39 charlie kernel: [ 8358.678216] [fglrx] enable ID = 0x00000005
May 17 17:31:39 charlie kernel: [ 8358.678222] [fglrx] Receive enable interrupt message with irqEnableMask: 10000000

Xgl.0.log.old says:
...
(II) fglrx(0): Shutdown CMMQS
(EE) fglrx(0): [drm] failed to remove DRM signal handler
(II) fglrx(0): [drm] removed 1 reserved context for kernel
(II) fglrx(0): [drm] unmapping 8192 bytes of SAREA 0x2000 at 0xb7b8c000
(II) fglrx(0): [drm] Closed DRM master.