$ sudo gdb gst-launch 11717
GNU gdb (Linaro GDB) 7.4-2012.06-ubuntu
Copyright (C) 2012 Free Software Foundation, Inc.
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Reading symbols from /usr/bin/gst-launch...(no debugging symbols found)...done.
Attaching to program: /usr/bin/gst-launch, process 11717
Cannot access memory at address 0x8d840f04
Cannot access memory at address 0x8d840f00
A program is being debugged already.  Kill it? (y or n) n
Program not killed.
(gdb) bt
#0  0xb7752424 in ?? ()
Cannot access memory at address 0x6