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Subject: Re: panic: pmap_demote_section: No l2_bucket for wired mapping
From: Michael Tuexen <tuexen@freebsd.org>
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Date: Sun, 22 Mar 2015 11:31:49 -0500
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 <20150322151934.GA31108@ci0.org>
To: Olivier Houchard <mlfbsd@ci0.org>
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> On 22 Mar 2015, at 10:19, Olivier Houchard <mlfbsd@ci0.org> wrote:
> 
> On Sun, Mar 22, 2015 at 06:54:06AM -0500, Michael Tuexen wrote:
>> Dear all,
>> 
> 
> Hi Michael, 
> 
>> running head on a Raspberry Pi became unstable. When running
>> r280329 for a while (the machine is exposed to the Internet, so
>> ssh logins are continuously tried), the machine panics:
>> 
>> panic: pmap_demote_section: No l2_bucket for wired mapping
>> 
>> It might be related to
>> https://svnweb.freebsd.org/changeset/base/280324
>> 
>> Any idea what is going on?
>> 
> 
> Doest backing rev 280324 out fixes it ? I'm at a loss as to why my commit 
Update: I was able to login and add
set vm.pmap.sp_enabled=0
to /boot/loader.rc
This way I was able to back out r280324 and recompile the kernel now. Once
that is finished I'll enable superpage support and will report if the issue
shows up or not.

Best regards
Michael
> could provoke this, and can't seem to reproduce it on my pandaboard.
> Another possibility is that rev 280327, which makes it possible to map
> library's code using superpages, uncovered a bug somewhere.
> 
> Regards,
> 
> Olivier
>