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Date:      Mon, 22 Mar 1999 20:04:07 +0100 (CET)
From:      Frederic LOYER <loyer@ensta.fr>
To:        mwhite@donet.com (Matt White)
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Strange Error Message
Message-ID:  <199903221904.UAA20478@quickstep.ensta.fr>
In-Reply-To: <000001be7402$9766b5c0$0402030a@yiff.bunnynet.org> from Matt White at "Mar 21, 1999  8:23:28 pm"

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> Hello...
> 
> Today while copying a large number of files I started getting this error
> message:
> 
> inetd in realloc(): warning: junk pointer, too low to make sense.
> inetd in free(): warning: junk pointer, too low to make sense.
> 
> This is a -STABLE system, last cvsupped and built on the 20th of this month.
> 
> Any idea what this means?  It prevented me from logging in, whenever I'd try
> to start up a telnet session it would toss those two lines to me and close
> the session. (I was still able to ssh in, which is not started via inetd.)
> 
> Thanks,
> Matt

I've found the same problem. This means there is a bug in "inetd" or one
of the called libraries. Trying to work with a debugger is difficult
since inetd crash after the fork(): you can't login but the "main"
inetd process is still alive to answer the following connection...
and crash again.

It seems to happen in malloc() called from login_getclass()... but
this doesn't tell us where the memory is screwed: there must be something
wrong before the fork() since this error comes on *every* connection after
the first error.

It could be triggered by the folowing lines:

comsat  dgram   udp     wait    tty:tty /usr/libexec/comsat     comsat
ntalk   dgram   udp     wait    tty:tty /usr/libexec/ntalkd     ntalkd

tty:tty is quite recent on -STABLE, and I don't remember seeing this
error before updating /etc/inetd.conf.  Anyway this error is too rare to
be debugged easily (I can't reproduce it).

--
Frederic Loyer <loyer@ensta.fr>


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