Date: Sun, 22 Mar 2015 13:18:19 -0500 From: Michael Tuexen <tuexen@freebsd.org> To: Olivier Houchard <mlfbsd@ci0.org> Cc: "freebsd-arm@freebsd.org" <arm@freebsd.org> Subject: Re: panic: pmap_demote_section: No l2_bucket for wired mapping Message-ID: <A029D8EF-7762-481E-8490-4405ED428A19@freebsd.org> In-Reply-To: <20150322181501.GA40209@ci0.org> References: <AF7A0CA1-6A0C-47CC-B096-646BBD235862@freebsd.org> <20150322151934.GA31108@ci0.org> <667A250D-91AC-4B81-97E3-4C351BB35577@freebsd.org> <20150322181501.GA40209@ci0.org>
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> On 22 Mar 2015, at 13:15, Olivier Houchard <mlfbsd@ci0.org> wrote: > > 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 ? No. I saw the problem by just letting it sitting around. Sometime it panics pretty fast (order of a minute after reboot). I can force it by doing a git pull on a large project (like wireshark). > Who has PID 15, and suffer such an unfortunate doom while trying to demote > pages ? I think it is the pagedaemon. Best regards Michael > > Regards, > > Olivier >home | help
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