panic: no upcall owned

[Peter Holm]

During stress test of current from Aug 11 01:16 UTC, I got:

#23 0xc064fb36 in thread_user_enter (p=0xc2052378, td=0xc1e01160)
    at ../../../kern/kern_kse.c:1179
1179            KASSERT(ku != NULL, ("no upcall owned"));

More info @ http://www.holm.cc/stress/log/cons64.html
-- 
Peter Holm