Comment 12 for bug 939023

This is with xserver-xorg-core-dbg installed:

# gdb /usr/bin/Xorg ./core
GNU gdb (Ubuntu/Linaro 7.4-0ubuntu1) 7.4
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/Xorg...Reading symbols from /usr/lib/debug/usr/bin/Xorg...done.
done.
[New LWP 30747]

warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
Core was generated by `Xorg -verbose 9999 -core'.
Program terminated with signal 11, Segmentation fault.
#0 0xb72023f7 in strchrnul () from /lib/i386-linux-gnu/libc.so.6
(gdb) bt f
#0 0xb72023f7 in strchrnul () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#1 0xb71c58a9 in vfprintf () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#2 0xb72820d8 in __vsnprintf_chk () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#3 0xb76cf75d in vsnprintf (__ap=0xb72e1318 "Segmentation fault", __fmt=<optimized out>, __n=1024, __s=0xbfaf1c20 "") at /usr/include/i386-linux-gnu/bits/stdio2.h:78
No locals.
#4 VAuditF (f=0xb <Address 0xb out of bounds>, args=0xb72e1318 "Segmentation fault") at ../../os/log.c:517
        prefix = 0xb84e32e0 "AUDIT: Fri Feb 24 07:48:54 2012: 30747: "
        buf = '\000' <repeats 32 times>"\320, \034\257\277", '\000' <repeats 12 times>, "\004\035\257\277\000\000\000\000\000\000\000\000@\264L\270,\255z\264\000\000\000\000\004\000\000\000\270@\354\264\000\000\000\000\250\070a\270l\257L\270\351\201\037\267\000\000\000\000\000\000\001\000\350\000D\267\240\225F\267\260\354N\270\000\000\000\000\020\000\000\000\314\034\257\277\225\066j\000\te&\267\270@\354\264i\327\211\264\v\000\000\000\364\237S\267@\264L\270\001\000\000\000\000\000\000\000\233rR\267\370\265L\270p\263L\270\001\000\000\000\301\062\203\264\000\000\000\000\270@촰\257L\270\260\257L\270\260\257L\270\000\220z\264\230\254z\264\000\000\000\000\231D\b\000\000\000\000\000\035\002\000\000\000\000\000\000\231D\000\000\334'\214\264\b\320p\264]&R\267\257{\031\267\005\275z\264\200\257L\270\260\326R\267\000\000\000\000P\257L\270\270@\354\061\002\000\000\000\346\274z\264\250\232\066\267\025\000\000\000\364\237S\267\260y\030\267\f\000\000\000\350\266L\270\003\000\000\000\n\000\000\000f\000\000\000\000\000\000\000 \000\000\000\000\000\000\000"...
        len = -1221717224
        oldbuf = '\000' <repeats 1023 times>
#5 0x0000000b in ?? ()
No symbol table info available.
#6 0x0000000b in ?? ()
No symbol table info available.
#7 0xb72e1318 in ?? () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)