Date: Wed, 11 Mar 2015 10:29:14 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: jungle Boogie <jungleboogie0@gmail.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: BBB freebsd-current backtrace. why? Message-ID: <85F7C686-B0D3-4A48-9180-C0BA9C7DD651@gromit.dlib.vt.edu> In-Reply-To: <CAKE2PDszqdzgGCCfqJBV9bvn5vTxTGTCJ0wjHkr4hn5RM5susQ@mail.gmail.com> References: <CAKE2PDvJ9dadCZpq7BdWfKUZyNUZ5O2e%2BD1yWaKYQ4TSCW8%2BEQ@mail.gmail.com> <CAA=KUhsE5w85Whxxv0FDhmyC-Rz8YfOsL8MPhB%2BMcrd9QE5-_A@mail.gmail.com> <CAKE2PDszqdzgGCCfqJBV9bvn5vTxTGTCJ0wjHkr4hn5RM5susQ@mail.gmail.com>
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On Mar 11, 2015, at 12:09 AM, jungle Boogie <jungleboogie0@gmail.com> = wrote: > Hi Jason, > On 10 March 2015 at 19:05, Jason Birch <jbirch@jbirch.net> wrote: >>=20 >> They're lock order reversals, as enabled by the WITNESS kernel = option. You >> probably don't need to worry, but it's helpful to check if they've = been >> reported and, if not, report them. >>=20 >> You might be running into this one: >> http://sources.zabbadoz.net/freebsd/lor/261.html >>=20 >> Quick Googling turns up these resources: >>=20 >> lock order reversals - what do they mean?: >> = https://lists.freebsd.org/pipermail/freebsd-current/2003-December/016617.h= tml >> Glossary of Kernel Options for Debugging: >> = https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-optio= ns.html >> FreeBSD LOR(lock order reversal)s seen and comments: >> http://sources.zabbadoz.net/freebsd/lor.html >=20 > Based on what Ian says, I hope these BT don't continue. Those threads > are very likely before the BBB was made...much less had freeBSD > running, so hopefully some progress has been made with freeBSD. Related to what Ian said (re: the LOR list not being actively maintained = any more), for a while now I have been using this kernel config file = with my Beaglebone Black: =3D=3D=3D=3D=3D8<=3D=3D=3D=3D=3D include BEAGLEBONE ident BEAGLEBONE-NO_WITNESS nooption WITNESS nooption WITNESS_SKIPSPIN =3D=3D=3D=3D=3D>8=3D=3D=3D=3D=3D I did this when the stability of FreeBSD/arm was rather shaky (it's = improved immensely, now), and I'd often confuse the LOR output for = panics at first glance. :-) Cheers, Paul.=
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