[CentOS] Diagnosing random hangs

Tue Dec 19 03:01:55 UTC 2006
David Mackintosh <David.Mackintosh at xdroop.com>

On Mon, Dec 18, 2006 at 01:54:24PM -0800, John R Pierce wrote:

> >X is frozen, no way to switch the console(i.e. Ctrl-Alt-F1, 
> >Ctrl-Alt-Backspace),
> >and no way to access the machine remotely.
> if you don't need X running, I'd stop loading it entirely (edit 
> /etc/inittab, and change the default runlevel to 3), and before your app 
> hangs, log onto the system console, and leave this command running as 
> root...
> # tail -f /var/log/messages /var/log/secure
> this way, any error logging will be displayed as the system crashes.

Or, you can start your application running in X, then switch to
Ctrl-Alt-F1, login there, and run the tails on the console.

If this isn't possible I would use syslog to forward *.debug to
another syslog server on the microscopic chance the system has some
transmitable last words.  

/ /()\ \ David Mackintosh | 
         dave at xdroop.com  | http://www.xdroop.com
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