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Date: Mon, 9 Jul 2001 13:47:07 -0700 (PDT)
From: Rudi Mathijssen <r.mathijssen@iris-ict.nl>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/28844: Router/nameserver system crashes 2-3 times monthly
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>Number:         28844
>Category:       kern
>Synopsis:       Router/nameserver system crashes 2-3 times monthly
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 09 13:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Rudi Mathijssen
>Release:        FreeBSD 4.2-RELEASE
>Organization:
Stichting IRIS
>Environment:
FreeBSD irsdevgate.irsdev.rechtsbijstand.net 4.2-RELEASE FreeBSD 4.2-RELEASE #0 Wed Apr 25 14:27:52 CEST 2001  root@irsdevgate.irsdev.rechtsbijstand.net:/usr/src/sys/compile/DEVGATE  i386
>Description:
System Compaq Proliant ML350 (600MHz pentium 3, 128MB ram) has 6 100Mbit nics: fxp0 (Intel Pro 10/100B/100+ Etherne), de0..3 (SMC 9332BDT), xl0 (3Com 3c905B-TX Fast Etherlink XL). Each nic is connected to a 3com 100Mbit hub (half duplex!) which is wired to a second proliant (traffic analyser and also cold standy for the gateway), and each to a 3com switch model 3300 to which the nt, sco, and true64 servers and pc hubs are connected. Three of the six lans are connected to a cisco wan router.
Disk configuration: RAID-1 setup with 2 9.1GB wu2 scsi disks on a compaq smart array 3200.
The custom kernel is ipfw enabled:
options         IPFIREWALL
options         IPFIREWALL_DEFAULT_TO_ACCEPT
options         DUMMYNET
but firewall_enable is currently set to "NO".
The system used to run FreeBSD 4.0, without the raid controller, and there was not a single problem. Since the "upgrade" it crashes irregularly 2-3 times per month. There is no crash dump or anything in /var/log. I have no screen dump of the panic screen (should we have a camera in the computer room?). After a few minutes the system resets itself. At times there are notifications in /var/log/messages like:
Jul  3 01:43:31 irsdevgate /kernel: de1: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
Jul  5 09:29:42 irsdevgate /kernel: xl0: no memory for rx list -- packet dropped!
There is, however, no correlation between the occurence these messages and the time of crashing.
>How-To-Repeat:
There appears (as yet) to be no link between the moment of crashing and external (network) or internal (e.g. cron) activity. 
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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