32c2dba8da
kern_exit race condition problem. this is a hack: don't vrele() or vgoneall() if we don't have the vnode any more. no vgoneall() is necessary, because if the refcnt is zero, there's nobody to take it away from! a possible "real" long term solution would be to change the extra ref into a bit in the vnode's flags, and DTRT in the places where the last ref is killed. That has some problems, too.