shutdown freeze and forced unmounts

[Matthew Dillon]

:I managed to get a vkernel to hang and cannot kill -9 it.  I attached
:gdb and this is what I get:

   Ok, I think its related to the threading.  Could you email me your
   current patch set and the tests you are running that get the vkernel
   into its unkillable state?  I'll try to reproduce it and track the
   problem down.

   How far into the boot sequence is your threaded vkernel getting now?
   If its getting to init then I have to get the multi-threaded VMSPACE_*
   support working (else things will explode).

						-Matt