Re: What is best method to debug freezes/hangs?
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 Thanks 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. -Derek -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks transtec Computers for their support. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
What is best method to debug freezes/hangs?
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 Thanks -- View this message in context: http://www.nabble.com/What-is-best-method-to-debug-freezes-hangs--tf4947151.html#a14164268 Sent from the freebsd-questions mailing list archive at Nabble.com. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: What is best method to debug freezes/hangs?
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 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
