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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 13:05:43 -0500
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References: <AF7A0CA1-6A0C-47CC-B096-646BBD235862@freebsd.org>
 <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:
>=20
> On Sun, Mar 22, 2015 at 06:54:06AM -0500, Michael Tuexen wrote:
>> Dear all,
>>=20
>=20
> Hi Michael,=20
>=20
>> 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:
>>=20
>> panic: pmap_demote_section: No l2_bucket for wired mapping
>>=20
>> It might be related to
>> https://svnweb.freebsd.org/changeset/base/280324
>>=20
>> Any idea what is going on?
>>=20
>=20
> Doest backing rev 280324 out fixes it ? I'm at a loss as to why my =
commit=20
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.

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.
>=20
> Regards,
>=20
> Olivier
>=20