[PATCH] Lockmgr deadlock on STABLE_8

[Pete French]

> http://www.freebsd.org/~attilio/lockmgr_fix8.diff
>
> I'm seeking for testers here.
> Any report would be very much appreciated.

I tested the patch on my machine which locks up, and I am afraid that it
still locks, even with the patch applied. The last things on the console
before the lock are.

1) A whole load of sshd errors for one of those flood attacks which try
multiple usersnames. This is not unusual, all my systems with an external
ssh port see this.

2) Four 'Watchdog timeout occurreed, resetting!" messages from if_bce.c.
These are new - without your patch I did not get these.

I have tried rnning this machine with WITNESS in the kernel, but it
will not deadlock then. Without WiTNESS it will lock up in about
twelve hours. I am going to try with just KDB and DDB to see if I can get
it into a state where we can get some useful information out of it.

I realsie, of course, that this might be utterly unrelated to the problem
your patch is trying to address!

cheers,

-pete.