fsck_ufs locked in snaplk

[Chris Dillon]

Quoting Kostik Belousov <kostikbel at gmail.com>:

>> I'm going to update to the latest 6.1 code this evening and enable
>> INVARIANTS, WITNESS, and the two DEBUG_LOCKS options to the kernel to
>> see if it catches anything.
>>
> Please, also add DDB to the kernel and show the result of the
> show lockedvnodes
> alltrace
> ps
> in the DDB after the deadlock, as asked by Kris Kennaway earlier
> in this thread !
>

OK, I've added DDB, but all of the information I might gather I'll  
have to write down by hand since I have no serial console access. :-(