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Date:      Wed, 12 Apr 2000 10:12:04 +1200
From:      "Dan Langille" <dan@freebsddiary.org>
To:        Guy Helmer <ghelmer@cs.iastate.edu>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: CRON in malloc(): warning: pointer to wrong page.
Message-ID:  <200004112212.KAA00861@ducky.nz.freebsd.org>
In-Reply-To: <Pine.HPX.4.05.10004111647540.9153-100000@popeye.cs.iastate.edu>
References:  <200004112006.IAA04082@ducky.nz.freebsd.org>

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On 11 Apr 00, at 16:59, Guy Helmer wrote:

> On Wed, 12 Apr 2000, Dan Langille wrote:
> 
> > The following type of mail message is arriving on a regular basis.  They
> > are related to each cron job that starts up.
> > 
> >  Date sent:      	Wed, 12 Apr 2000 07:55:01 +1200 (NZST)
> >  From:           	root (Cron Daemon)
> >  To:             	root
> >  Subject:        	Cron <root@ducky> /usr/libexec/atrun
> > 
> >  CRON in malloc(): warning: pointer to wrong page.
> > 
> > I can't see anything in /var/log/messages related to this.
> > 
> > Coincidentally (or not), the box rebooted itself yesterday.  Any clues
> > for me please?
> 
> This isn't the first report of CRON spewing these messages (see GNATS PRs
> bin/11169 and bin/9722) so I have been looking at the problem.  I have
> patches for cron that might solve the problem but I am unable to duplicate
> the problem and thus unable to prove my patches solve it.  If you would
> like to try the patches, please let me know and I will send them.
> 
> As for the reboot, I would suggest enabling crash dumps by setting dumpdev
> in /etc/rc.conf and building & installing a debugging kernel.  With these
> steps. it would be possible to capture the machine state and get a
> traceback (via gdb -k) if the reboot is due to a kernel panic.  I would not
> expect that the reboot would be due to cron, but a crash dump would verify
> what process was running when the crash took place.
> 
> I'll try to get the cron patches reviewed and checked into the source tree
> soon...

I would be quite happy to do a traceback etc, but this is a 486 with 
16MB of ram.  It takes 3 days to make world. <grin>
--
Dan Langille - DVL Software Limited [I'm looking for more work]
http://www.dvl-software.com/ |  http://www.unixathome.org/
http://www.racingsystem.com/ |  http://www.freebsddiary.org/


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