[dreed@localhost ~]$ gdb xmodmap core.4770
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This GDB was configured as "i386-redhat-linux-gnu"...(no debugging symbols
found)...Using host libthread_db library "/lib/tls/libthread_db.so.1".

Core was generated by `xmodmap /etc/X11/Xmodmap'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/X11R6/lib/libX11.so.6...(no debugging symbols
found)...done.
Loaded symbols for /usr/X11R6/lib/libX11.so.6
Reading symbols from /lib/tls/libc.so.6...Reading symbols from
/usr/lib/debug/lib/tls/libc-2.3.3.so.debug...done.
done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/libdl.so.2...Reading symbols from
/usr/lib/debug/lib/libdl-2.3.3.so.debug...done.
done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/ld-linux.so.2...Reading symbols from
/usr/lib/debug/lib/ld-2.3.3.so.debug...done.
done.
Loaded symbols for /lib/ld-linux.so.2
#0  _int_malloc (av=0xf6fc3800, bytes=144169120) at malloc.c:3993
3993          fwd->bk = victim;
(gdb) bt
#0  _int_malloc (av=0xf6fc3800, bytes=144169120) at malloc.c:3993
#1  0xf6f021e1 in *__GI___libc_malloc (bytes=1) at malloc.c:3337
#2  0x08048fd1 in ?? ()
#3  0x00000001 in ?? ()
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()
(gdb) 


Version-Release number of selected component (if applicable):
xorg-x11-6.8.1-12
xinitrc-4.0.14-1

How reproducible:
Every time I startx