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From: "J. Bruce Fields" <bfields@fieldses.org>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org,
	Neil Brown <neilb@suse.de>
Subject: Re: Oops in NFSv4 server in 2.6.23.17
Date: Fri, 14 Mar 2008 14:14:13 -0400	[thread overview]
Message-ID: <20080314181413.GF2119@fieldses.org> (raw)
In-Reply-To: <20080313143631.GH27873@ics.muni.cz>

On Thu, Mar 13, 2008 at 03:36:31PM +0100, Lukas Hejtmanek wrote:
> Hello,
> 
> On Wed, Mar 12, 2008 at 12:00:07PM -0400, J. Bruce Fields wrote:
> > In this case it looks like something in the gss context cache is bad.
> > 
> > I'm not sure what's going on.
> 
> I discovered what triggers this bug. If I have default export with secure
> option and I try to connect from insecure port, it produces the oops.
> If I add insecure option to the export, no oops at all and mount succeeds.
> 
> Also, the bug is not triggered by the first attempt but by the second one.
> 
> So I guess that from the first attempt there is something inserted into gss
> context cache - error occurs (insecure attempt with the secure option), gss
> context is removed from the cache as invalid but not completely. And the
> second attempt does oops. Sounds reasonable for me. 
> 
> Hope this helps to find the bug.

That's an excellent clue, thanks.  I wonder it would be explainable by a
reference count imbalance of some kind in fh_verify?  I don't quite see
it yet, and unfortunately can't yet reproduce the bug here.

--b.

  reply	other threads:[~2008-03-14 18:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-12 12:25 Lukas Hejtmanek
2008-03-12 16:00 ` J. Bruce Fields
2008-03-13 14:36   ` Lukas Hejtmanek
2008-03-14 18:14     ` J. Bruce Fields [this message]
2008-03-14 19:33       ` J. Bruce Fields
2008-03-14 19:53         ` Lukas Hejtmanek
2008-03-14 20:05           ` J. Bruce Fields
2008-03-14 23:37             ` [PATCH] nfsd: fix oops on access from high-numbered ports J. Bruce Fields
2008-03-14 23:42             ` Oops in NFSv4 server in 2.6.23.17 J. Bruce Fields
2008-03-16 23:19               ` Neil Brown
2008-03-19 22:32                 ` J. Bruce Fields
2008-03-20  2:31                   ` NeilBrown
2008-03-17  8:12             ` Lukas Hejtmanek
2008-03-17 13:15               ` J. Bruce Fields

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