gdb завершается с ошибкой «Невозможно найти порт задачи Mach для процесса -id»

Мое приложение работает нормально, но gdb не может его отладить со следующей ошибкой

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

Я на OS X Lion. Версия GDB

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