panic: __lockmgr_args: recursing on non recursive lockmgr ntnode @ (null):0

[Mikhail T.]

A laptop I'm helping configure (remotely) just crashed under me... Upon 
reboot I found the following in the messages file (quite amazed, that 
the message got there, actually):

    Jul 12 22:06:01 s syslogd: kernel boot file is /boot/kernel/kernel
    Jul 12 22:06:01 s kernel: panic: __lockmgr_args: recursing on non
    recursive lockmgr *ntnode* @ (null):0
    Jul 12 22:06:01 s kernel:
    Jul 12 22:06:01 s kernel: cpuid = 0
    Jul 12 22:06:01 s kernel: Uptime: 6h10m53s
    Jul 12 22:06:01 s kernel: Cannot dump. Device not defined or
    unavailable.
    Jul 12 22:06:01 s kernel: Automatic reboot in 15 seconds - press a
    key on the console to abort
    Jul 12 22:06:01 s kernel: Rebooting...
    Jul 12 22:06:01 s kernel: cpu_reset: Stopping other CPUs

The system just finished installing a new port of OpenOffice and 
cleaning up WRKSRC afterwards (a huge collection of files), and was 
running /etc/periodic/weekly/310.locate explicitly, when the crash happened.

Is this something, that's already solved and I just need to upgrade? The 
current kernel is: FreeBSD 8.1-PRERELEASE #0: Wed Jul  7 19:04:57 CEST 
2010, i386. 4 CPUs (Full dmesg.boot available upon request.)

Does the "ntnode" above point to the NTFS filesystems on this laptop? 
The laptop uses Windows' swap-file as its own swap (via md(4)) and uses 
Windows' TrueType fonts as well...

Thanks!

    -mi