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:
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
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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