Would you be able to look at https://wiki.ubuntu.com/DebuggingXorg and
try to get a full stack trace?
This is the stack trace from the log:
2:
/usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state_locked+0x7e1)
[0xaf85bf91]
3: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state+0x2a)
[0xaf85c0ea]
4: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_GetIntegerv+0x280)
[0xaf817860]
5: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c850c2]
6: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c79b2c]
7: /usr/bin/X [0x815755e]
8: /usr/bin/X(Dispatch+0x1aa) [0x808f47a]
9: /usr/bin/X(main+0x495) [0x8076f05]
** Changed in: xorg-server (Ubuntu)
Assignee: (unassigned) => Tormod Volden (tormodvolden)
Status: New => Incomplete
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Xorg crashed with SIGSEGV in _mesa_update_state_locked() with DRI disabled
https://bugs.launchpad.net/bugs/145289
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