FreeBSD Security Advisory FreeBSD-SA-02:37 - Local users can cause a kernel panic using the kqueue system. If a pipe was created with the pipe(2) system call, and one end of the pipe was closed, registering an EVFILT_WRITE filter on the other end would cause a kernel panic.
18ab150b52ce585a4c7a0ec2f65b535359a1e43a56079bd38c7a0cc792ed51b4