FreeBSD Security Advisory FreeBSD-SA-02:44 - FreeBSD 4.3 and later is vulnerable to a local denial service attack due to a bug in the fpathconf system call which crashes the system by repeatedly calling fpathconf on a file descriptor until the reference count wraps to a negative value, then closing the file descriptor. See Pine-cert-20030101.txt for more information.
aacf0c83903b87562681466b20bcaa250cf0fb40cfd75e49cd68e3de7dbd5952