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From: Mark Atkinson <atkin901@yahoo.com>
Date: Thu, 29 Oct 2009 12:39:17 -0700
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Subject: Re: panic: _mtx_lock_sleep: recursed on non-recursive mutex process
 lock @ /usr/src/sys/kern/kern_sig.c:981
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Kostik Belousov wrote:
> On Thu, Oct 29, 2009 at 11:18:29AM -0700, Mark Atkinson wrote:
>> I got this panic this morning, after a fresh upgrade to svn current
>> during concurrent NFS access from a couple of clients:
>>
>> FreeBSD 9.0-CURRENT #7 r198588: Thu Oct 29 08:55:09 PDT 2009
> This is supposedly fixed by r198590.

What amazingly bad timing on my part.  Or, if not, it should be
considered for an earlier MFC.  Thanks!

> 
>> Unread portion of the kernel message buffer:
>> panic: _mtx_lock_sleep: recursed on non-recursive mutex process lock @
>> /usr/src/sys/kern/kern_sig.c:981