Date: Wed, 05 Dec 2007 06:19:49 +0100 From: Per olof Ljungmark <peo@intersonic.se> To: yar <owensr57@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: What is best method to debug freezes/hangs? Message-ID: <475634F5.6030901@intersonic.se> In-Reply-To: <14164268.post@talk.nabble.com> References: <14164268.post@talk.nabble.com>
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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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