I think this affects me - in my case, the SIGPIPE comes when I run 3dmark2000 
or 3dmark06 in wine.
It only happens once in a while, but it's happened three times today.

Program received signal SIGPIPE, Broken pipe.
0xb7769430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7769430 in __kernel_vsyscall ()
#1  0xb754ea61 in writev () from /lib/tls/i686/cmov/libc.so.6
#2  0x080ad40e in ?? ()
#3  0x080acb5f in ?? ()
#4  0x080a84d6 in ?? ()
#5  0x080a8f3f in FlushAllOutput ()
#6  0x080a8f71 in FlushIfCriticalOutputPending ()
#7  0x080723a5 in ?? ()
#8  0x08066d7a in _start ()

I've previously posted about this at
http://www.nvnews.net/vbulletin/showthread.php?p=2245689
and
http://www.mail-archive.com/[email protected]/msg00424.html
before I tried gdb; the stack trace from xorg.log looks different.

When I did 'cont' after the SIGPIPE, 3dmark2000 happily continues,
but I think without gdb there, the server aborts.

-- 
Xorg crash with SIGPIPE after successful login
https://bugs.launchpad.net/bugs/546525
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