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Date: Thu, 21 Feb 2013 12:49:45 -0500
From: Jung-uk Kim <jkim@FreeBSD.org>
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To: John Baldwin <jhb@freebsd.org>
Subject: Re: -CURRENT userland regression
References: <51254ACE.2030100@delphij.net> <51254C7E.9050705@gmail.com>
 <201302211031.31599.jhb@freebsd.org>
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Cc: freebsd-current@freebsd.org, Xin Li <delphij@delphij.net>,
 Navdeep Parhar <nparhar@gmail.com>
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On 2013-02-21 10:31:31 -0500, John Baldwin wrote:
> On Wednesday, February 20, 2013 5:21:50 pm Navdeep Parhar wrote:
>> On 02/20/13 14:14, Xin Li wrote:
>>> Hi,
>>> 
>>> It seems that fresh -HEAD would give an unusable kernel that 
>>> overwrites screen buffer in a way making it impossible to
>>> debug. Using an old world source to do 'make buildworld
>>> buildkernel' results in a (mostly: I have some strange USB
>>> issue right now and still looking for the cause) usable
>>> kernel.
>>> 
>>> For now my known good combination is world 246858 with kernel
>>> 247057. I'm still trying to find out which revision have broke
>>> the stuff.
>> 
>> I ran into this earlier today.  Selecting "safe mode" in the boot
>> loader menu seems to work around the problem on my system.  Now I
>> will not reboot until I see a fix for this in head :-)
> 
> "safe mode" toggles a few different things IIRC, can you narrow it
> down to a single setting?

kern.smp.disabled=1

Jung-uk Kim
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