From owner-freebsd-questions  Tue Sep  9 16:15:58 1997
Return-Path: <owner-freebsd-questions>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id QAA14379
          for questions-outgoing; Tue, 9 Sep 1997 16:15:58 -0700 (PDT)
Received: from freebie.lemis.com (gregl1.lnk.telstra.net [139.130.136.133])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id QAA14366
          for <questions@freebsd.org>; Tue, 9 Sep 1997 16:15:50 -0700 (PDT)
Received: (from grog@localhost)
	by freebie.lemis.com (8.8.7/8.8.5) id IAA18655;
	Wed, 10 Sep 1997 08:45:35 +0930 (CST)
Message-ID: <19970910084535.11505@lemis.com>
Date: Wed, 10 Sep 1997 08:45:35 +0930
From: Greg Lehey <grog@lemis.com>
To: Joe McGuckin <joe@via.net>
Cc: questions@freebsd.org
Subject: Re: /: file system is full
References: <199709091717.KAA29928@monk.via.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailer: Mutt 0.81e
In-Reply-To: <199709091717.KAA29928@monk.via.net>; from Joe McGuckin on Tue, Sep 09, 1997 at 10:17:37AM -0700
Organisation: LEMIS, PO Box 460, Echunga SA 5153, Australia
Phone: +61-8-8388-8250
Fax: +61-8-8388-8250
Mobile: +61-41-739-7062
WWW-Home-Page: http://www.lemis.com/~grog
Fight-Spam-Now: http://www.cauce.org
Sender: owner-freebsd-questions@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

On Tue, Sep 09, 1997 at 10:17:37AM -0700, Joe McGuckin wrote:
>
> I was trying to cause my system to crash. So, I thought that I'd use up all
> the available memory.
>
> I wrote a simple 'C' program to malloc a 1 MB chunk, then write into it to
> insure that the paged were allocated
>
> while(1){
>    p = (char *) malloc(1024*1024);
>    *p = '1';
> }

This will only allocate the first page.  *p is the same thing as p
[0].  To allocate all pages, you need to loop through at offsets of
4096.

> Very quickly, I get back a msg about "/: file system full"
>
> What going on here?

Good question.  Where's your swap?

Greg