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Date: Sun, 22 Mar 2015 19:15:01 +0100
From: Olivier Houchard <mlfbsd@ci0.org>
To: Michael Tuexen <tuexen@freebsd.org>
Subject: Re: panic: pmap_demote_section: No l2_bucket for wired mapping
Message-ID: <20150322181501.GA40209@ci0.org>
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On Sun, Mar 22, 2015 at 01:05:43PM -0500, Michael Tuexen wrote:
> > 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 
> OK, testing done. Backing out 280324 does NOT help. So the issue is not related
> to this patch.
> Disabling superpages helps to work around the issue.
> 

Is there any specific workload on your RPi, beside getting ssh-scanned ?
Who has PID 15, and suffer such an unfortunate doom while trying to demote
pages ?

Regards,

Olivier