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From: John Baldwin <jhb@freebsd.org>
To: freebsd-alpha@freebsd.org, Kevin Thompson <kevin@antiduh.com>
Date: Mon, 13 Nov 2006 09:45:38 -0500
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Cc: 
Subject: Re: alpha/105134: 'panic: lockmgr: thread ... not exclusive lock
	owner' on SMP Alpha EV6 machine
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On Sunday 12 November 2006 14:10, Kevin Thompson wrote:
> The following reply was made to PR alpha/105134; it has been noted by GNATS.
> 
> From: "Kevin Thompson" <kevin@antiduh.com>
> To: bug-followup@freebsd.org, antiduh@csh.rit.edu
> Cc:  
> Subject: Re: alpha/105134: 'panic: lockmgr: thread ... not exclusive lock 
owner' on SMP Alpha EV6 machine
> Date: Sun, 12 Nov 2006 14:04:16 -0500
> 
>  Downgraded to FreeBSD 5.5 and the machine has been stable for a couple  
>  days now. I guess something bad happened between 5 and 6, I'm guessing  
>  giant.

6.x has lots of changes to add locking to VFS.  Have you tried running 
with 'debug.mpsafevfs=0' set via the loader with 6.x?

-- 
John Baldwin