From owner-freebsd-stable  Wed Sep 13 22:58: 5 2000
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Date: Thu, 14 Sep 2000 08:57:25 +0300
From: Alex Popa <razor@ldc.ro>
To: Gustavo Vieira Goncalves Coelho Rios <kernel@tdnet.com.br>
Cc: freebsd-stable@freebsd.org
Subject: Re: qmail + freebsd = reboot
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In-Reply-To: <39BFD3C8.5167FF96@tdnet.com.br>; from kernel@tdnet.com.br on Wed, Sep 13, 2000 at 07:21:44PM +0000
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On Wed, Sep 13, 2000 at 07:21:44PM +0000, Gustavo Vieira Goncalves Coelho Rios wrote:
> Dear gentleman,
> 
> i have just installed qmail in my freebsd box, but after request qmail
> to send my message, i got my box reboot. At a first look, the machine is
> not supposed to be reboot under a software error, if it does it is an
> operating system problem matter.
> 
> FreeBSD is well known for its rock solid performance, but i am really
> confused since another server running linux do the job very well.
> 
> This reboot only happens when i send MANY message to a domain outside my
> box one, all local messages are delivered very well. My qmail version is
> 1.03
> 
> here goes my uname -a:
> 
> grios@etosha:~$ uname -a
> FreeBSD etosha 4.1-STABLE FreeBSD 4.1-STABLE #0: Sun Sep 10 17:59:18 GMT
> 2000     root@etosha:/usr/obj/usr/src/sys/ETOSHA  i386
> 
> 
> All i got in /var/log/messages is (only the part pertinent to qmail)
> 
> Sep 13 17:12:21 etosha /kernel: pid 3197 (qmail-remote), uid 1008:
> exited on sig
> nal 11
> 

That shouldn't happen (you already knew that).

I have a *very* wild guess, please send the following data:
	- Do you have a firewall with states enabled?
	- Do you run your own DNS server (caching nameserver at least)?
		- If so, which one?
	- What is the value of concurrencyremote?
		(/var/qmail/bin/qmail-showctl should tell you)
	- What is the maxusers value on your kernel?

My guess is that some state table gets fscked up, and causes the machine to
reboot (not verified, but it is well-known that qmail is *very*
aggressive in sending mail out, and each qmail-remote process does
some dns lookups, and an external connection attempt...)

Note: the above is a wild guess, and might be (and probably is)
completely wrong.

Have fun!

------------+------------------------------------------
Alex Popa,  |There never was a good war or a bad peace
razor@ldc.ro|                   -- B. Franklin
------------+------------------------------------------
"It took the computing power of three C-64s to fly to the Moon.
It takes a 486 to run Windows 95. Something is wrong here."


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