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Here it is again, with "ServerFlags" Option "NoTrapSignals" in xorg.conf.
I'm afraid it's still not terribly informative.

This is happening to me a couple of times a day.

All so far have been in Eclipse but that's the only really large X
application that I'm using right now.

Script started on Tue Aug 23 17:48:59 2005
ian:2$ ls -lL /X* $(which X)
-rw-r----- 1 root wheel 22392136 Aug 23 17:47 /Xorg.core
-rwsr-xr-x 1 root wheel 1791891 Aug 15 13:26 /usr/X11R6/bin/X
ian:3$ gdb $(which X) /X*
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-unknown-openbsd3.8"...
Core was generated by `Xorg'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libz.so.4.1...done.
Loaded symbols for /usr/lib/libz.so.4.1
Reading symbols from /usr/lib/libm.so.2.0...done.
Loaded symbols for /usr/lib/libm.so.2.0
Reading symbols from /usr/lib/libusbhid.so.3.0...done.
Loaded symbols for /usr/lib/libusbhid.so.3.0
Reading symbols from /usr/lib/libc.so.38.2...done.
Loaded symbols for /usr/lib/libc.so.38.2
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0 0x868d18d3 in ?? ()
(gdb) where
#0 0x868d18d3 in ?? ()
#1 0x00000000 in ?? ()
#2 0x00000787 in ?? ()
#3 0x00000000 in ?? ()
#4 0x00000000 in ?? ()
#5 0x00000008 in ?? ()
#6 0x83a27ff8 in ?? ()
#7 0x00000888 in ?? ()
#8 0xcfbd2690 in ?? ()
#9 0x0000f776 in ?? ()
#10 0x00000888 in ?? ()
#11 0xcfbd2708 in ?? ()
#12 0x7dc5229f in ?? ()
#13 0x83a27ff8 in ?? ()
#14 0x00000008 in ?? ()
#15 0x00000002 in ?? ()
#16 0xcfbd26c0 in ?? ()
#17 0xcfbd2690 in ?? ()
#18 0x00000888 in ?? ()
#19 0x0000f776 in ?? ()
#20 0x0000f776 in ?? ()
#21 0x83a27fc0 in ?? ()
#22 0x7ea01080 in ?? ()
#23 0xcfbd26a8 in ?? ()
#24 0x00010000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#25 0x00000002 in ?? ()
#26 0x00000008 in ?? ()
#27 0x00000008 in ?? ()
#28 0x83a27ff8 in ?? ()
#29 0x00080000 in ?? ()
#30 0xffff0000 in ?? ()
#31 0x00000000 in ?? ()
#32 0x00000001 in ?? ()
#33 0x00010000 in ?? ()
#34 0x00000000 in ?? ()
#35 0x00000000 in ?? ()
#36 0x00000000 in ?? ()
#37 0x00000000 in ?? ()
#38 0x00000000 in ?? ()
#39 0xcfbd26f8 in ?? ()
#40 0x1c0ece29 in miCreateAlphaPicture ()
Previous frame inner to this frame (corrupt stack?)
(gdb) ian:4$ ^D

Script done on Tue Aug 23 17:49:54 2005