Re: [Devmon] Periodic DEVMON lockup

[G. F. <ga...@fr...>]

Good day or night,

On Monday 09 June 2008 15:18:27 Kauffman, Tom wrote:
> Devmon is hanging for me, on average once per day. No error messages
> anywhere that I can see, no entries in the log, nothing.

Same issue here.  Frequency is a couple of times per week.  But still
very very annoying.

Le Mon, 9 Jun 2008 17:39:51 +0200, Buchan Milne écrivait:
> I've seen this twice in the past month. I haven't had an opportunity to track 
> it down.
> 
> If you can start devmon in debug mode (say in screen), the last output from it 
> when it dies might be useful.

For those who want to help troubleshooting this further, here is a
little "howto" (for debian-based system):


1) Patch code to actually send message to display server when running
in debug mode.

By default, if you are running devmon in debug mode, it does not send
any report to the display server, just display them on screen.  This is
fine in testing environement but is not applicable if you want to
troubleshoot a problem on your production server.

So you may want ot apply attached patch to change this behaviour :

patch dm_msg.pm dm_msg.pm.diff


2) Install "screen"

aptitude install screen


3) Stop any running devmin instance

/etc/init.d/devmon stop


4) Running devmon in verbose debug "screened" foreground mode :

screen /usr/local/devmon/devmon -f --debug -vvvv


5) Go get some coffee

You can close the console devmon is running into and wait for the
problem to happen.

You can also leave the console running a "detach" from the screen by
hitting "Ctrl+A d".


6) Go back to the console

To re-attach to the console devmon is running into (certainly when
devmon goes purple) :

screen -r

And send the information you see on this list.


As I just set this up on my production machine which is hanging every
couple of days, I hope I can send you more information pretty soon.

Have a great day or night.

-- 
Gaëtan Frenoy <ga...@fr...>