At 08:49 PM 12/4/2007, yar wrote:

My question is how best to go about debugging sporadic freezes and hangs.
Just looking for general methods.    On a couple of our IDS systems there
are sporadic hangs or freezes that occur every couple weeks or so, that are
recoverable by either system reboots or taking out and reinserting the Gig
fiber ethernet sniffing cables, but I  never can find anything in
/var/logs/messages to tell what is going on. I'm assuming that may have to
compile in kernel debugger support, but from what I read briefly, doesn't
that require an actual crash with the resultant reboot and a debugger
readable file  left in /var/crash?  That doesn't happen, there is no
automatic reboot just a freeze/hang (box falls off network and at the
console unable to type until one of the two above mentioned measures are
take. The systems are:

Dell 1850's
Free BSD 6.2
2 Gb ram
running various open source IDS software  BRO


I would be sure your systems are running the generic kernel, or as close to generic that is possible to rule out anything you could have introduced by running a custom kernel.

I would also run complete diagnostics on the hardware to rule out any hardware issues.

You can also gather some information by having a script run top periodically and logging this to a file to see what the system is doing. You can check the last log entry of this file after a freeze/hang to see what was going on.


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