kern/111413: panic when nfsd running

[Kris Kennaway]

The following reply was made to PR kern/111413; it has been noted by GNATS.

From: Kris Kennaway <kris at obsecurity.org>
To: riton <bla at gericos.com>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/111413: panic when nfsd running
Date: Mon, 9 Apr 2007 23:48:41 -0400

 On Mon, Apr 09, 2007 at 02:50:15PM +0000, riton wrote:
 
 > When nfsd is running, here is the type of panic I have (not always the same):
 > 
 > FreeBSD/i386 (nfs01) (ttyd0)
 > 
 > login: Memory modified after free 0xcc0b0a00(508) val=dead80de @ 0xcc0b0b7c
 > panic: Most recently used by vnodemarker
 
 You will need to configure DEBUG_MEMGUARD to watch this malloc type.
 Unfortunately this requires a tiny change to the source so it is not
 completely trivial, but see memguard(9).
 
 Once you have done this, you will hopefully get a different panic when
 the memory is first accessed after it was freed, and we can proceed
 from there.
 
 Kris