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Condor uses clone in a way that causes GDB grief. Running a Condor daemon under GDB will likely fail with errors similar to: 

warning: Can't attach LWP -1: No such process
../../gdb/linux-thread-db.c:389: internal-error: thread_get_info_callback: Assertion `inout->thread_info != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

The solution is to tell Condor to not to use clone, but to fall back on the fork code path. In your Condor configuration file, use: 

USE_CLONE_TO_CREATE_PROCESSES = false

(This page primarily exists as search bait, so that others hitting this error can quickly find the solution.)