Date: Fri, 10 Apr 2015 14:39:05 +0530 From: Pratik Singhal <ps06756@gmail.com> To: Zbigniew Bodek <zbb@freebsd.org> Cc: "freebsd-arm@freebsd.org" <arm@freebsd.org> Subject: Re: panic: pmap_demote_section: No l2_bucket for wired mapping Message-ID: <CAGf2gkPPHrqZrohSeGvE%2B2LGErwQs9n4hEOhmjOr%2Bh27=Hbeew@mail.gmail.com> In-Reply-To: <CALF_Txn85FYTNsvnjUpSc7aGaNB=wZ8pSGP7nUBwQvjqvOx%2Bvg@mail.gmail.com> References: <AF7A0CA1-6A0C-47CC-B096-646BBD235862@freebsd.org> <1EFF2C41-456C-476E-9BA8-712E62DF0D4E@gromit.dlib.vt.edu> <CALF_Txn85FYTNsvnjUpSc7aGaNB=wZ8pSGP7nUBwQvjqvOx%2Bvg@mail.gmail.com>
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I am also able to reproduce the same bug on my Cubieboard 1 with freeBSD 11-current :- I am pasting the stack trace and the boot log. boot log :- http://pastie.org/10084212 stack trace :- http://pastie.org/10084214 On Mon, Mar 23, 2015 at 6:11 AM, Zbigniew Bodek <zbb@freebsd.org> wrote: > 2015-03-22 20:45 GMT+01:00 Paul Mather <paul@gromit.dlib.vt.edu>: > > On Mar 22, 2015, at 7:54 AM, Michael Tuexen <tuexen@freebsd.org> wrote: > > > >> Dear all, > >> > >> 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 > >> 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=0 prevents the panic (so far) and allows booting. > > > > Cheers, > > > > Paul. > > > > I was able to reproduce this on my R-Pi too. > The bug may be related to shared libraries mapping since excluding > pmap_enter_section() (the one in the pmap_enter_object() that is > responsible for doing the work for shared libraries mappings) results > in normal operation even with page promotion/demotion enabled. > I will try to find some time to look into that to ensure that this is > not just covering the problem. If it doesn't then we may consider > disabling pmap_enter_section() (by adding "return FALSE;") to have WA > (without disabling superpages) until we find the real solution. > pmap_enter_section() was being used very rarely before shared > libraries superpage mappings were enabled so it is reasonable to think > that the bug is somewhere around. Please let me know in case you find > something. > > Best regards > zbb > _______________________________________________ > freebsd-arm@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" > -- Regards, Pratik Singhal
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