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Date:      Wed, 11 Mar 2015 08:11:06 -0600
From:      Ian Lepore <ian@freebsd.org>
To:        jungle Boogie <jungleboogie0@gmail.com>
Cc:        "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
Subject:   Re: BBB freebsd-current backtrace. why?
Message-ID:  <1426083066.33324.34.camel@freebsd.org>
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 Tue, 2015-03-10 at 21:09 -0700, jungle Boogie wrote:
> Hi Jason,
> On 10 March 2015 at 19:05, Jason Birch <jbirch@jbirch.net> wrote:
> >
> > 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
> 
> 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.

The point is that those LORs are harmless.  They were declared harmless
by the gurus who understand them, years ago, and apparently just by
issuing that proclamation, it's a closed subject and we all just have to
live with the spewage.

-- Ian





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