[CentOS] Diagnosing random hangs

Tue Dec 19 12:20:26 UTC 2006
Mark Belanger <mark_belanger at ltx.com>

John R Pierce wrote:
> Mark Belanger wrote:
>> Matthew Miller wrote:
>>> On Mon, Dec 18, 2006 at 04:17:59PM -0500, Mark Belanger wrote:
>>>> I have many different centos machines that are hanging
>>>> regulary.  I believe this is due to something our application
>>>> is doing - not a centos specific problem.
>>>> When the machines hang, there is no access to the console
>>>> or remote access(ssh, rsh, etc).
>>> Do you mean that there's no *access* to the console, or that it doesn't
>>> *respond* on the console?
>> 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.

X is required - though I could accomplish the same thing by
logging in remotely.  So far, the log files haven't  shown anything

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Mark Belanger
LTX Corporation