Here his what I have on console:
   xcall(cpu0, f00078dc): couldn't ping cpus: cpu1
   simple_lock: locking against myself (this is probably the cause of the lookup
   without lockdebug)
   lock: 0xf01bbb88, currently at: sys_generic.c:996 on cpu0
   last locked: kern_sync.c:659
   last unlocked: kern_sync.c:637
   logwakeup+0x28
   printf+0xa4
   xcall+0x328
   sched_wakeup+0x1e0
   wakeup+0x84
   lwp_exit2+0x64
   exit2+0x64
   switchexit+0x3c
   cpu_exit+0x120
   exit1+0x128
   sys_exit+0x2c


this looks like the xcall() calls printf() which wakes up the scheduler
because of the log device bug that pk fixed a couple of days ago?  please
update and see if it still fails?


.mrg.