O gdb falha com o erro "Não foi possível encontrar a porta de tarefa do Mach para o ID do processo"

Meu aplicativo é executado bem, mas o gdb não consegue depurá-lo com o seguinte erro

(gdb) run
Starting program: /path/to/app 
Unable to find Mach task port for process-id 83767: (os/kern) failure (0x5).

Eu estou no OS X Lion. A versão do GDB é

$ gdb --version
GNU gdb 6.3.50-20050815 (Apple version gdb-1752) (Sat Jan 28 03:02:46 UTC 2012)
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 "x86_64-apple-darwin".

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