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Date: Wed, 1 Feb 2006 08:09:23 -0800
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Message-ID: <20060201160923.GA67621@troutmask.apl.washington.edu>
References: <200601311109.k0VB9MRq025366@repoman.freebsd.org>
	<20060201104752.A68774@grasshopper.cs.duke.edu>
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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
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On Wed, Feb 01, 2006 at 10:47:52AM -0500, Andrew Gallatin wrote:
> Pawel Jakub Dawidek [pjd@FreeBSD.org] wrote:
> > 
> >   FreeBSD src repository
> > 
> >   Modified files:
> >     sys/kern             kern_malloc.c 
> >     share/man/man9       Makefile 
> >     sys/conf             NOTES files options 
> >   Added files:
> >     share/man/man9       redzone.9 
> >     sys/vm               redzone.c redzone.h 
> >   Log:
> >   Add buffer corruption protection (RedZone) for kernel's malloc(9).
> >   It detects both: buffer underflows and buffer overflows bugs at runtime
> >   (on free(9) and realloc(9)) and prints backtraces from where memory was
> >   allocated and from where it was freed.
> >   
> 
> If I enable DEBUG_REDZONE on an amd64 machine (UP, 512MB ram),
> I get this panic on startup:
> 
> FreeBSD 7.0-CURRENT #0: Tue Jan 31 17:17:41 EST 2006
>     gallatin@venice:/usr/src/sys/amd64/compile/VENICEW
> 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
into sys/ on 2006-01-26 that is causing the problems.
I suspect the pts code, but can't prove it, yet.

-- 
Steve