What do you do to the machine:-).
I'd try another list, netbsd-bugs, current-users maybe...

> on an Ultra 10 running -current kernel as of 20001111:
>
> simple_lock: lock held
> simple_lock: lock held
> lock: 0x1411a90, currently at: ../../../../kern/sys_generic.c:979
> last locked: ../../../../kern/kern_synch.c:599
> last unlocked: ../../../../kern/kern_synch.c:616
> lock: 0x1411a90, currently at: ../../../../kern/kern_synch.c:284
> last locked: ../../../../kern/kern_synch.c:599
> last unlocked: ../../../../kern/sys_generic.c:987
> panic: kernel diagnostic assertion
> "_simple_lock_held((&sched_lock))" failed: file
> "../../../../kern/kern_synch.c", line 959
> 
> kdb breakpoint at 0x126f4e0
> Stopped at      cpu_Debugger+0x4:       nop
> db> 

--
	Andrey