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.


In my case with the above behaviour a debug kernel and ctrl+alt+esc would work and that is probably true most of the times.

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html

HTH,
--per
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