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Date:      Wed, 10 Mar 1999 19:39:23 -0500 (EST)
From:      Robert Watson <robert@cyrus.watson.org>
To:        sthaug@nethelp.no
Cc:        des@flood.ping.uio.no, dillon@apollo.backplane.com, dcs@newsguy.com, Jos.Backus@nl.origin-it.com, dima@tejblum.dnttm.rssi.ru, perhaps@yes.no, freebsd-current@FreeBSD.ORG
Subject:   Re: panic: zone: entry not free
Message-ID:  <Pine.BSF.3.96.990310193534.27517C-100000@fledge.watson.org>
In-Reply-To: <28892.921083219@verdi.nethelp.no>

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On Wed, 10 Mar 1999 sthaug@nethelp.no wrote:

> > Uh, no. Invariants are for developers who want to make sure their code
> > is correct. There is no reason why an end user would want to build a
> > kernel with invariants enabled. Invariants will *not* increase data
> > safety. If they have any effect at all (i.e. if they actually catch a
> > bug), the result is a panic (whereas with a kernel without invariants,
> > the bug might actually go unnoticed).
> 
> So for the end user it's better to have the bug go unnoticed than to
> get a kernel panic and notice the bug? Please tell me I'm misunder-
> standing something here.

# Halt the system (panic) on discovering an unexpected kernel
# inconsistency, in an attempt to prevent data corruption.  Disabled
# by default on production releases because of increased CPU load and that
# these states "should never happen".  Good on -CURRENT.
#
# Bugs: Does not stop on other kinds of failures (hardware, etc)
#
# options	FAILSTOP

  Robert N Watson 

robert@fledge.watson.org              http://www.watson.org/~robert/
PGP key fingerprint: 03 01 DD 8E 15 67 48 73  25 6D 10 FC EC 68 C1 1C

Carnegie Mellon University            http://www.cmu.edu/
TIS Labs at Network Associates, Inc.  http://www.tis.com/
Safeport Network Services             http://www.safeport.com/



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