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Date: Mon, 22 Aug 2011 09:43:34 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Garrett Cooper <yanegomi@gmail.com>
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Cc: FreeBSD Current <freebsd-current@FreeBSD.org>,
	"Kenneth D. Merry" <ken@FreeBSD.org>
Subject: Re: panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx
 @ /usr/src/sys/kern/kern_cons.c:420 when running dump in ddb
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on 22/08/2011 04:34 Garrett Cooper said the following:
> On Thu, Aug 18, 2011 at 5:55 PM, Garrett Cooper <yanegomi@gmail.com> wrote:
>> Hi,
>>    Long story short, I was running a UP kernel on a netbook trying to
>> stimulate a crash and when I did dump, it would periodically fail
>> non-recursive mutex failure with the output shown below (I caught it
>> once, but the other times the dump failed).
> 
>     This actually shows up when generating a panic via boot -v with
> WITNESS, so it's potentially a race condition on my laptop. Adding
> MTX_RECURSE to the mutex object didn't help things either.

You may want to try to reproduce this panic with the following patch:
http://article.gmane.org/gmane.os.freebsd.stable/76534

-- 
Andriy Gapon