Date: Wed, 11 Mar 2015 13:05:18 +1100 From: Jason Birch <jbirch@jbirch.net> To: jungle Boogie <jungleboogie0@gmail.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: BBB freebsd-current backtrace. why? Message-ID: <CAA=KUhsE5w85Whxxv0FDhmyC-Rz8YfOsL8MPhB%2BMcrd9QE5-_A@mail.gmail.com> In-Reply-To: <CAKE2PDvJ9dadCZpq7BdWfKUZyNUZ5O2e%2BD1yWaKYQ4TSCW8%2BEQ@mail.gmail.com> References: <CAKE2PDvJ9dadCZpq7BdWfKUZyNUZ5O2e%2BD1yWaKYQ4TSCW8%2BEQ@mail.gmail.com>
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On Wed, Mar 11, 2015 at 11:35 AM, jungle Boogie <jungleboogie0@gmail.com> wrote: > Hello All, > > Brand new download and install of -current on my beagle bone black and > getting below backtrace, but the portsnap extract is continuing. If > this is how it was on last weeks image, the backtrace will randomly > print something similar to what's below even when the BBB is inactive. > > Downloaded from: > ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/arm/armv6/ISO-IMAGES/11.0/ > > Is this expected? > > root@beaglebone:~ # portsnap fetch extract update > Looking up portsnap.FreeBSD.org mirrors... 7 mirrors found. > Fetching public key from isc.portsnap.freebsd.org... done. > Fetching snapshot tag from isc.portsnap.freebsd.org... done. > Fetching snapshot metadata... done. > Fetching snapshot generated at Tue Mar 10 00:05:13 UTC 2015: > 248798a3bfb5e11c4a642a6254d9ec1573982894936270100% of 71 MB 2297 kBps > 00m32s > Extracting snapshot... lock order reversal: > 1st 0xcd228ba0 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3097 > 2nd 0xc2fa0e00 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:285 > KDB: stack backtrace: > 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. You might be running into this one: http://sources.zabbadoz.net/freebsd/lor/261.html Quick Googling turns up these resources: lock order reversals - what do they mean?: https://lists.freebsd.org/pipermail/freebsd-current/2003-December/016617.html Glossary of Kernel Options for Debugging: https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-options.html FreeBSD LOR(lock order reversal)s seen and comments: http://sources.zabbadoz.net/freebsd/lor.html
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