APC problem with PHP

Hey all, I'm new to the list. I came here because I couldn't find the answer to my question and I'm hoping I can find it here. I compiled the APC plugin as a shared library and activated it through the php.ini. I ran 'make test' and it seemed to pass all but one (it skipped a test). I thought all was well. Unfortunately it wasn't. In the middle of the night I woke up to SMS messages from the monitoring that the server was going down hard. I got the server back up and found that PHP was segfaulting and puking core files everywhere and it filled up the drive. I removed all the core files and restarted the server and it happened again. So I removed APC, restarted the server and the core files stopped. So just to make sure I put APC back on and saw that PHP started dumping again. I'm not advanced enough to try and debug the core files but I do know enough to try and see what is going on. I used gdb to peer in to a core file and saw that libthread_db.1.so or something like that was the culprit. Does anyone know what would cause PHP to start segfaulting after APC was installed? Thanks, Jamie