DO_VOP/lockmgr related panic

[Matthew Dillon]

    I will attempt to reproduce the problem on my test box.

    The traceback you have is not helpful other then to validate that it's
    a problem related to dangling vnode locks.  Whatever caused the problem
    occured some time previously.

    The null pointer dereference is a gdb issue, not an actual null pointer
    (if you look at the args list for the procedure 'ap' is not NULL).

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>