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Date:      Thu, 27 Jul 1995 11:11:14 +0100 (BST)
From:      Doug Rabson <dfr@render.com>
To:        Matt Dillon <dillon@blob.best.net>
Cc:        davidg@root.com, bugs@freebsd.org
Subject:   Re: brelse() panic in nfs_read()/nfs_bioread() 
Message-ID:  <Pine.BSF.3.91.950727111003.230N-100000@minnow.render.com>
In-Reply-To: <199507270327.UAA21946@blob.best.net>

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On Wed, 26 Jul 1995, Matt Dillon wrote:

> :>   synch the disks but it can't dump core.  The only message I
> :>   get is the panic message on the console:
> :>
> :>	panic biodone: page busy < 0
> :>	off: 180224, foff: 180224, valid: 0xFF, dirty:0 mapped:0
> :>	resid: 4096, index: 0, iosize: 8192, lblkno: 22
> :>
> :>    I believe the failure is related to NFS.  The question is,
> :>    is this a new bug or do any of the recent patches have a
> :>    chance at fixing it?  Hard question considering the lack
> :>    of information.
> :
> :   We've been working on this problem for the past week or so and believe it
> :is fixed in 2.2-current and 2.1-stable. Please update your sources and let us
> :know if the problem persists.
> 
>     Doesn't look good so far re: this particular bug and the latest
>     patches from current, the poor thing crashed again but we missed
>     the console messages so I'll have to wait till the next crash
>     to be sure it is the same bug.  On the bright side, it doesn't look
>     like any new bugs have been introduced :-)

Could you get a DDB backtrace for this crash?  It may be caused by a 
mistake in NFS' use of the VFS bio code.

--
Doug Rabson, Microsoft RenderMorphics Ltd.	Mail:  dfr@render.com
						Phone: +44 171 251 4411
						FAX:   +44 171 251 0939




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