unkillable mozilla-bin

Hello!

It's been a while since I last saw an unkillable process on -current,
but here it is -- on 5.2-RELEASE. From ps(1):

  UID   PID  PPID CPU PRI NI   VSZ  RSS MWCHAN STAT  TT       TIME COMMAND
 1042 14627     1   0  96  0 61216 49300 -      W     pa    
4:34,22 ./mozilla-bin http://www.ex[...]

and from top(1):

  PID USERNAME        PRI NICE   SIZE    RES STATE    TIME   WCPU    CPU 
COMMAND
14627 mteterin         96    0 61216K 49300K WAIT     4:34  0.00%  0.00% 
mozilla-bin

The ps(1) seems to indicate, ``The process is swapped out'', so here is my
swap:
	Device          1K-blocks     Used    Avail Capacity
	/dev/ad2b          524288       36   524252     0%
	/dev/md8          1572864       44  1572820     0%
	Total             2097152       80  2097072     0%

(md8 is vnode-backed using the pagefile.sys on Windows partition, ad2 is
a separate disk, used by FreeBSD entirely).

The process has been in this state since Thursday, Jan 29th -- it seemed
to have hung and I tried to kill it. Numerous ``kill'', ``kill -9'' were
ineffective. Although xkill(1) helped me get rid of the window, the process
still lives and accounted for another bit of CPU time:

 1042 14627     1   0  76  0 61216 49276 -      W     pa    
4:34,23 ./mozilla-bin http://www.extr[...]

None of the directories used by this process according to fstat is
nfs-backed. A freshly built lsof does not list ANY files as opened by
the PID.

An attempt to attach a debugger (gdb) to the process hangs.

Any clues? Thanks!

	-mi