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Date:      Fri, 17 Dec 1999 09:52:20 +0000 (GMT)
From:      Doug Rabson <dfr@nlsystems.com>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Andrew Gallatin <gallatin@cs.duke.edu>, freebsd-current@freebsd.org
Subject:   Re: Serious server-side NFS problem
Message-ID:  <Pine.BSF.4.10.9912170952050.51079-100000@salmon.nlsystems.com>
In-Reply-To: <199912160600.WAA47882@apollo.backplane.com>

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On Wed, 15 Dec 1999, Matthew Dillon wrote:

>     Here's a general update on this bug report to -current.  It took all day
>     but I was finally able to reproduce Andrew's bug.
> 
>     You guys are going to *love* this.
> 
>     NFS uses the kernel 'boottime' structure to generate its version id.
>     Now normally you might believe that this structure, once set, will
>     never change.  The authors of NFS certainly make that assumption!
> 
>     No such luck.  If you happen to be running, oh, xntpd for example,
>     the kernel adjusts the boottime structure to take into account time
>     changes, including PLL changes so, in fact, the boottime structure
>     can change quite often - once each tick, in fact.

Nice catch, Matt.

--
Doug Rabson				Mail:  dfr@nlsystems.com
Nonlinear Systems Ltd.			Phone: +44 181 442 9037




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