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Date: Sat, 11 Jan 2014 22:15:59 -0500
From: Adam McDougall <mcdouga9@egr.msu.edu>
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To: freebsd-stable@freebsd.org
Subject: Re: panic:  stable/10 with Debugging enabled in kern_cons.c:500
References: <1389478327.46758.7.camel@powernoodle.corp.yahoo.com>
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On 01/11/2014 17:44, Sean Bruno wrote:
> On Sat, 2014-01-11 at 14:12 -0800, Sean Bruno wrote:
>> I can't imagine that I'm the first person to run with the following
>> debug options enabled:
>>
>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
>>
>> But, I can't get stable/10 to post on a plain old supermicro box with
>> those debugging symbols enabled.  
>>
>> random: unblocking device.
>> panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx
>> @ /usr/src/sys/kern/kern_cons.c:500
>>
> 
> Witness induced.  Removed the witness option and this doesn't happen
> (obviously).  Can I get someone familiar with console code to look into
> this?  Kind of crappy when I'm investigating a resource starvation
> issue.
> 
> sean
> 

Confirmed panic in 10-r258899M (20131203) on XenServer.  For reference,
what is your rev?