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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Thu, 20 Aug 2009 15:31:05 -0800
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Cc: Scott Schappell <archon@silvertree.org>
Subject: Re: Remounting a drive as read/write crashes the system and no
	dmesg.boot
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On Thursday 20 August 2009 15:00:48 Scott Schappell wrote:
> On Aug 20, 2009, at 15:42:05, Mel Flynn wrote:
> > I don't. It's perfectly valid to mount a device multiple times and
> > on the same
> > node even. Certainly unmounting then remounting should not panic the
> > system.
> >
> > If you keep getting this panic, please try and obtain a crash dump,
> > though I
> > suspect this to be driver or hardware related as I can't imagine
> > such a bug
> > has slipped into vfs/ufs.
> > --
> > Mel
>
> Since using the mount -r syntax, it hasn't crashed once.  How does one
> obtain a crash dump? I'll be happy to force the system to hork and
> send a crash log.

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html
-- 
Mel