[Ltsp-discuss] Hunting stability issues

[Lars Madsen]

Hi list

I'm still attempting to hunt down the stability issues we experience.

We've found this

http://sourceforge.net/p/ltsp/mailman/message/21412560/

and adjusted the clients to use (1), (2) seems to be in effect already (though nbd swap does not seem to use -persist)

My primary test user is currently experiencing the following

>From he boots the terminal until it automatically reboots (or icons disappear) it takes exactly (!?!)

2 hours 12 mins

It is so consistent that there *has* to be some sort of time out somewhere that we have overlooked.

Some have mentioned issues with keeping X11 alive over SSH, but as far as I know all the ssh connections run with -X or -Y options.

Any ideas on where to proceed with debugging this?

Sys info:

Clients: Ubuntu 12.04
Server: Ubuntu 14.04





/Lars Madsen
Institut for Matematik / Department of Mathematics
Aarhus Universitet / Aarhus University
Mere info: http://au.dk/***@imf / More information: http://au.dk/en/***@imf

[John Hupp]

Thanks for the http://sourceforge.net/p/ltsp/mailman/message/21412560/
reference. I have also had stability issues under Lubuntu 14.04 PNP.
But when it occurs here both the terminal and server lock up hard,
rather than just the terminal rebooting or icons disappearing. So this
is perhaps a different problem, but I appreciate having some measures to
test.

I'll be interested in hearing your report of any further progress.

On 5/27/2015 4:06 AM, Lars Madsen wrote:
> Hi list
>
> I'm still attempting to hunt down the stability issues we experience.
>
> We've found this
>
> http://sourceforge.net/p/ltsp/mailman/message/21412560/
>
> and adjusted the clients to use (1), (2) seems to be in effect already (though nbd swap does not seem to use -persist)
>
> My primary test user is currently experiencing the following
>
> >From he boots the terminal until it automatically reboots (or icons disappear) it takes exactly (!?!)
>
> 2 hours 12 mins
>
> It is so consistent that there *has* to be some sort of time out somewhere that we have overlooked.
>
> Some have mentioned issues with keeping X11 alive over SSH, but as far as I know all the ssh connections run with -X or -Y options.
>
> Any ideas on where to proceed with debugging this?
>
> Sys info:
>
> Clients: Ubuntu 12.04
> Server: Ubuntu 14.04
>
>
>
>
>
> /Lars Madsen
> Institut for Matematik / Department of Mathematics
> Aarhus Universitet / Aarhus University
> Mere info: http://au.dk/***@imf / More information: http://au.dk/en/***@imf
>
>
> ------------------------------------------------------------------------------
> _____________________________________________________________________
> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
> For additional LTSP help, try #ltsp channel on irc.freenode.net

[Lars Madsen]

well, so far it seems that it is the client that is closing off the NBD connection for some reason. It happens after two hours exactly, almost to the minute.

I'll have to check IPTABLES to see if something is timing out.

I my tests, I've booted a client, logged in to the server and locked the user (screen saver). Then directly on the client prompt I've set a logger to test the existence of the ssh connection from the client to the server.

Around the 2 hour mark the ssh connection dies. The client seems to be back at the login screen and often we get squashfs errors from the kernel.


/Lars Madsen
Institut for Matematik / Department of Mathematics
Aarhus Universitet / Aarhus University
Mere info: http://au.dk/***@imf / More information: http://au.dk/en/***@imf


________________________________________
From: John Hupp [***@prpcompany.com]
Sent: 03 June 2015 17:33
To: ltsp-***@lists.sourceforge.net
Subject: Re: [Ltsp-discuss] Hunting stability issues

Thanks for the http://sourceforge.net/p/ltsp/mailman/message/21412560/
reference. I have also had stability issues under Lubuntu 14.04 PNP.
But when it occurs here both the terminal and server lock up hard,
rather than just the terminal rebooting or icons disappearing. So this
is perhaps a different problem, but I appreciate having some measures to
test.

I'll be interested in hearing your report of any further progress.

On 5/27/2015 4:06 AM, Lars Madsen wrote:
> Hi list
>
> I'm still attempting to hunt down the stability issues we experience.
>
> We've found this
>
> http://sourceforge.net/p/ltsp/mailman/message/21412560/
>
> and adjusted the clients to use (1), (2) seems to be in effect already (though nbd swap does not seem to use -persist)
>
> My primary test user is currently experiencing the following
>
> >From he boots the terminal until it automatically reboots (or icons disappear) it takes exactly (!?!)
>
> 2 hours 12 mins
>
> It is so consistent that there *has* to be some sort of time out somewhere that we have overlooked.
>
> Some have mentioned issues with keeping X11 alive over SSH, but as far as I know all the ssh connections run with -X or -Y options.
>
> Any ideas on where to proceed with debugging this?
>
> Sys info:
>
> Clients: Ubuntu 12.04
> Server: Ubuntu 14.04
>
>
>
>
>
> /Lars Madsen
> Institut for Matematik / Department of Mathematics
> Aarhus Universitet / Aarhus University
> Mere info: http://au.dk/***@imf / More information: http://au.dk/en/***@imf
>
>
> ------------------------------------------------------------------------------
> _____________________________________________________________________
> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
> For additional LTSP help, try #ltsp channel on irc.freenode.net


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