Aha, have found a backtrace in gdm/:0.log.1:
---
*** glibc detected *** /usr/X11R6/bin/X: double free or corruption (out): 
0x0a68a7b0 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7d00604]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7d025b6]
/usr/X11R6/bin/X(Xfree+0x21)[0x8139021]
/usr/X11R6/bin/X(dixFreePrivates+0xbb)[0x8072c0b]
/usr/lib/xorg/modules//libfb.so(fbDestroyPixmap+0x32)[0xb77b4282]
/usr/lib/xorg/modules//libexa.so[0xb778fc60]
/usr/X11R6/bin/X[0x817f5e2]
/usr/lib/xorg/modules/extensions//libextmod.so[0xb7a70018]
/usr/X11R6/bin/X(dixDestroyPixmap+0x15)[0x8086d35]
/usr/X11R6/bin/X(FreeResource+0x10c)[0x8074c3c]
/usr/X11R6/bin/X(ProcFreePixmap+0x93)[0x8088663]
/usr/X11R6/bin/X(Dispatch+0x33f)[0x808d57f]
/usr/X11R6/bin/X(main+0x3bd)[0x80722ed]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7ca7775]
/usr/X11R6/bin/X[0x80717a1]
---

So it definitely seems like an xorg problem.

** Attachment added: "gdmlogold.txt"
   http://launchpadlibrarian.net/26378075/gdmlogold.txt

-- 
Random xorg crash with gdm_slave_xioerror_handler fatal error
https://bugs.launchpad.net/bugs/372532
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