Comment 2 for bug 334156

Note that this only works if process is interrupted with Ctrl+C, if instead cancel is pressed:

thomas@thomas-laptop:~$ gdb gnome-screenshot 2>&1 | tee gdb-gnome-screenshot.txtGNU gdb 6.8-debian
Copyright (C) 2008 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 "i486-linux-gnu"...
(gdb) handle SIG33 pass nostop noprint
Signal Stop Print Pass to program Description
SIG33 No No Yes Real-time event 33
(gdb) set pagination 0
(gdb) set logging file gdb-gnome-screenshot.log
(gdb) set logging on
Copying output to gdb-gnome-screenshot.log.
(gdb) run
Starting program: /usr/bin/gnome-screenshot
[Thread debugging using libthread_db enabled]
[New Thread 0xb6d9c700 (LWP 24181)]
[New Thread 0xb6c1eb90 (LWP 24372)]

** (gnome-screenshot:24181): WARNING **: Couldn't find window manager window
[New Thread 0xb59d2b90 (LWP 24391)]
[New Thread 0xb51d1b90 (LWP 24392)]
[New Thread 0xb49d0b90 (LWP 24394)]
[Thread 0xb59d2b90 (LWP 24391) exited]
[Thread 0xb6c1eb90 (LWP 24372) exited]
[New Thread 0xb6c1eb90 (LWP 24638)]

Program exited normally.
(gdb) backtrace full
No stack.
(gdb) info registers
The program has no registers now.
(gdb) thread apply all backtrace
No registers.
(gdb) quit