GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-linux-gnu".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/X...(no debugging symbols found)...done.
(gdb) attach 1431
Attaching to program: /usr/bin/X, process 1431
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib/ld-2.11.1.so...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x00007f7c57011fc3 in ?? ()
(gdb) Detaching from program: /usr/bin/X, process 1431