[Users] More, but different crashes (in fastlock.h?)

Trying openser-head, and have noticed that after an hour or so of heavy usage, it just stops responding to incoming requests. The only way out is to kill it, and restart a backtrace on the resulting core shows #0 destroy_kill () at fastlock.h:76 76 fastlock.h: No such file or directory. in fastlock.h (gdb) bt #0 destroy_kill () at fastlock.h:76 #1 0xb7d1dc7a in exec_shutdown () at exec_mod.c:92 #2 0x08078502 in destroy_modules () at sr_module.c:355 #3 0x0805fb5d in cleanup (show_status=0) at main.c:351 #4 0x080614ea in main (argc=0, argv=0xb7fb9800) at main.c:1580 Something obvious out of whack? cheers