My machine seemed to hang, so I put a monitor on to have a look and I got
the following:

    panic: spincheck_switchcheck CPU 0 has 1 spin lock
    Stopped in pagedaemon at _cpu_Debugger+0x6: unit a6

I can type reboot, I know, but I was wondering if there's a way out without
a reboot? I don't want to lose my uptime, and it would be more convenient.
Anyone know? 

Last time I tried killing the pid I had no luck.

All the best.

Matthew