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Date:      Wed, 1 Feb 2006 12:54:56 -0500
From:      Andrew Gallatin <gallatin@cs.duke.edu>
To:        Steve Kargl <sgk@troutmask.apl.washington.edu>
Cc:        cvs-src@FreeBSD.org, src-committers@FreeBSD.org, Pawel Jakub Dawidek <pjd@FreeBSD.org>, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/kern kern_malloc.c src/share/man/man9 Makefile redzone.9 src/sys/vm redzone.c redzone.h src/sys/conf NOTES files options
Message-ID:  <20060201125456.A68851@grasshopper.cs.duke.edu>
In-Reply-To: <20060201171754.GA67925@troutmask.apl.washington.edu>; from sgk@troutmask.apl.washington.edu on Wed, Feb 01, 2006 at 09:17:54AM -0800
References:  <200601311109.k0VB9MRq025366@repoman.freebsd.org> <20060201104752.A68774@grasshopper.cs.duke.edu> <20060201160923.GA67621@troutmask.apl.washington.edu> <17376.58731.618704.264566@grasshopper.cs.duke.edu> <20060201171754.GA67925@troutmask.apl.washington.edu>

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Steve Kargl [sgk@troutmask.apl.washington.edu] wrote:
> On Wed, Feb 01, 2006 at 11:44:27AM -0500, Andrew Gallatin wrote:
> > 
> > Steve Kargl writes:
> >  > On Wed, Feb 01, 2006 at 10:47:52AM -0500, Andrew Gallatin wrote:
> >  > > WARNING: WITNESS option enabled, expect reduced performance.
> >  > > Memory modified after free 0xffffff0000006d00(248) val=5 @ 0xffffff0000006dd0
> >  > > kernel trap 9 with interrupts disabled
> >  > 
> >  > You can trigger this panic without the red zone stuff.
> >  > See my string of post from yesterday.  Something went
> > 
> > Your panic looks like the same panic as mine, but with memguard rather
> > than redzone.  These systems do similar things, I suppose it is only
> > natural that they'd be hit by the same bug.
> 
> You get it without memguard, too.  Kris suggested that I try memguard
> to capture the problem.  Unfortunately, memguard actually made
> matters worse in that I did not even make it to single user mode
> before a panic.

Odd.  I do not get it without using either memguard or redzone.
I have a (mostly generic) kernel with WITNESS & INVARIANTS
that boots fine.

Maybe we should move this to -current or -amd64, as it does not
seem to be directly related to this commit..

Drew




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