Here is an article from the Nokia KB to log the problem instead of
rebooting.
The IP330 and IP650 (also later versions of the VPN-210 and VPN-220)
each contain a hardware watchdog timer. This timer detects system hangs
and reboots the box. In the log, one will see the following error
message in /var/log/messages:
Mar 30 14:35:59 fw006 [LOG_CRIT] kernel: WARNING: The reboot was due to
watchdog timer detecting a hang
Solution: The watchdog timer is tickled more than once during the
watchdog timeout period by the kernel timer. The kernel timer is a high
priority timer which fires every 10ms. If the reboot was due to watchdog
timer expiring, then for some reason the kernel timer failed to tickle
the watchdog timer. This may happened if the kernel timer was held off
for a long period of time (~2secs), or due to faulty hardware.
When the watchdog timer expires, the fault LED is lit by the hardware.
It is cleared on the subsequent boot.
Given that the kernel hardclock timer tickles the watchdog timer,
holding off hardclock for a long time will cause the watchdog timer to
expire. It just means the clock interrupt was held off for a long time
(perhaps because the system was extremely busy for an extended period of
time), or because of faulty hardware. It'll require further analysis to
determine the exact reason this occured in your situation.
The log entry is generated only on reboot. This is so because the
watchdog timer expiring does not generate an interrupt (it does a
reset). And, the reason is determined only on the subsequent boot. It is
possible, however, to change the behavior with the following command:
ipsctl -w -t string hw:watchdog:action switch
This instructs the watchdog to log a message (instead of rebooting the
box) if it detects trouble.
This change is not carried from reboot to reboot. You need to create
the file /var/etc/rc.local and enter the following into that file:
sleep 15
ipsctl -w -t string hw:watchdog:action switch
This ensures this change takes place at every bootup
-----Original Message-----
From: Mailing list for discussion of Firewall-1
[mailto:FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM] On Behalf Of Ade
Shoy
Sent: Thursday, July 21, 2005 2:21 AM
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Subject: [FW-1] Watchdog timer expiring - resulting in system rebooting
constantly
Hi All,
I'm currently experiencing problems with an IP330 rebooting itself. The
messege obtained from running commmand "dmesg" indicates that reboot was
due to watchdog tmer detecting a hang. Does anyone now how to resolve
this ie stop the system from power cycling itself, could this be a
hardware problem
thanks
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