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Date:      Sat, 7 Dec 1996 17:54:31 -0500 (EST)
From:      "John S. Dyson" <toor@dyson.iquest.net>
To:        Gregory_D_Moncreaff@ccmail.ed.ray.com
Cc:        dg@root.com, hackers@freebsd.org
Subject:   Re: Re[2]: FreeBSD 2.1: panic: vm_page_free: invalid wire count
Message-ID:  <199612072254.RAA12987@dyson.iquest.net>
In-Reply-To: <01ICQHQ35F4Y003FF8@ZEUS.ED.RAY.COM> from "Gregory_D_Moncreaff@ccmail.ed.ray.com" at Dec 7, 96 04:32:00 pm

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>      I don't understand why it would show up now, and only
>      on one of the 6 machines I have running the same verion
>      of FreeBSD.
> 
>      Re the 2.1.6.1R version, has Walnut Creek got that on CDROM yet,
>      their page says 2.1.5 is the version they have...
> 
One of the reasons that bugs like this occur at all is that they
are not always reproduceable.  No matter how careful I am when I
write or port code, it appears that bugs sometimes appear.  When
testing, if I don't encounter it, I sometimes assume that there
is none, and commit it to the system.  You have encountered such
a bug.

It is likely that a few people had encountered it during testing, but
maybe not?  You are seeing the same syndrome that I see when I modify
or write kernel code.  It can appear to work perfectly for 99% of the
people 99% of the time, but when the bug is found, it is amazing that
the code ever worked at all!

John



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