If a stray pointer write corrupts memory, then commit is the most likely place where the failure will happen.
You may want to use one of the memory checking tools to check against memory corruption (which could be anywhere in the program). I think "valgrind" can do this, on Linux. I'm not too familar with this sort of stuff, though.
I have used electric fence with great success
http://freshmeat.net/projects/efence/?topic_id=47
Brian
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