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Subject: Re: panic: pmap_demote_section: No l2_bucket for wired mapping
From: Paul Mather <paul@gromit.dlib.vt.edu>
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Date: Sun, 22 Mar 2015 15:45:06 -0400
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References: <AF7A0CA1-6A0C-47CC-B096-646BBD235862@freebsd.org>
To: Michael Tuexen <tuexen@freebsd.org>
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On Mar 22, 2015, at 7:54 AM, Michael Tuexen <tuexen@freebsd.org> wrote:

> Dear all,
>=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
> KDB: enter: panic


I get this panic when booting to multi-user on my newly-updated BBB =
(FreeBSD 11.0-CURRENT #0 r280350).  As pointed out later in this thread, =
setting vm.pmap.sp_enabled=3D0 prevents the panic (so far) and allows =
booting.

Cheers,

Paul.