Race conditions, in some instances, may not be able to be reproduced on demand. However, the race condition is still there. Lack of a positive does not prove a negative.

In your case, with the current load on your machine, this may not crop up. Down the road, when the machine is more loaded, or the filesystem is being hammered, when you wonder why your process is hanging around without finding the last piece of data, remember Randal's words.

Spoken from experience,