From owner-freebsd-hackers  Mon Aug 12 09:22:26 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id JAA26908
          for hackers-outgoing; Mon, 12 Aug 1996 09:22:26 -0700 (PDT)
Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.211])
          by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id JAA26879;
          Mon, 12 Aug 1996 09:21:44 -0700 (PDT)
Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id JAA25398; Mon, 12 Aug 1996 09:16:39 -0700
From: Terry Lambert <terry@lambert.org>
Message-Id: <199608121616.JAA25398@phaeton.artisoft.com>
Subject: Re: machine crashing, what panic: free means?
To: gpalmer@FreeBSD.ORG (Gary Palmer)
Date: Mon, 12 Aug 1996 09:16:39 -0700 (MST)
Cc: lmcsato@lmc.ericsson.se, hackers@FreeBSD.ORG
In-Reply-To: <28182.839817357@orion.webspan.net> from "Gary Palmer" at Aug 11, 96 10:35:57 pm
X-Mailer: ELM [version 2.4 PL24]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> 
> Samy Touati wrote in message ID
> > Does anybody knows what a free panic means?
> 
> We didn't charge you for it.
> 
> :-)

8-).

Generally, it means that something was freed twice.  THis is a bad thing.

Typically, you can get this from reallocating vnodes by rolling off the
top of the freelist back to the tail.  There is an off-by-1 error that
will let this happen.  I think newer versions of the OS (you didn't
identify your version) had my patch rolled in (it was a kludge in the
vfs_subr.c; you can get the patch from the -current list archive on
www.freebsd.org -- or update your code).


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.