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Date:      Mon, 04 Mar 2002 16:35:09 -0700
From:      "Jan L. Peterson" <jlp@softhome.net>
To:        Ian Dowse <iedowse@maths.tcd.ie>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: crashes on 4.5-RELEASE 
Message-ID:  <20020304233509.5BFD0422D8@mail.flipdog.com>
In-Reply-To: Your message of "Sat, 23 Feb 2002 20:21:34 GMT." <200202232021.aa04276@salmon.maths.tcd.ie> 
References:  <200202232021.aa04276@salmon.maths.tcd.ie>

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Okay, to resurrect a dead horse, the last thing I got before leaving 
the office for a week was from Ian Dowse:

> Try adding "options INVARIANTS" and "options INVARIANT_SUPPORT" to
> your kernel config

Ian also suggested a patch to mbuf.h, but I'll get to that in a minute.

So I turned on "options INVARIANTS" and "options INVARIANT_SUPPORT", 
rebuilt my kernel, rebooted, and now, tah-dah, it doesn't crash (at 
least, not yet).  I did get an odd "xl0: watchdog timeout" or two, but 
the system is still running after 8 hours of heavy NFS traffic (would 
have killed it in minutes before).

Interesting, ehh?

Ian, I didn't apply the patch to mbuf.h yet (added the options from 
memory and didn't remember the patch until I went back and looked at 
your mail just now).  If it panics, I'll put the patch in and try 
again.

So what exactly does INVARIANTS do?  According to LINT, it enables 
extra sanity checking of internal structures (making the system 
slower).  

Seems to be a lot of people reporting crashing problems on 4.5, even on 
hardware that was previously stable.  Could be we have a real problem 
here?

	-jan-
-- 
Jan L. Peterson
<jlp@softhome.net>



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