Edubuntu 12.04 LTSP - Fat clients hangs on shutdown with Kernel 3.8 and higher

[Nick Fenger]

Alkis,

Tested the new nbd-disconnect on my Gateway E4610's and Dell Optiplex's
740's and they are now shutting down properly without my modifications to
the poweroff command. I tested using the graphical sessions and by
executing halt -p (forgot to test poweroff but I believe that command is
equivalent) from the tty1 command line.

I will submit a request an SRU (update release) if you can direct me to
where I do that?

Thanks,

-Nick

On Mon, May 19, 2014 at 11:41 PM, Alkis Georgopoulos <alkisg at gmail.com>wrote:

> Στις 20/05/2014 02:18 πμ, ο/η Nick Fenger έγραψε:
>
>  Alkis,
>>
>> I've done some more testing and the newest nbd-disconnect IS working on
>> my previously non-working Dell Optiplex 7xx series. As you stated,
>> shutdown works when initiated from the graphical interfaces - LightDM
>> (fat) and LDM (thin). I'll test my Gateway E Series systems when I'm at
>> my other school tomorrow.
>>
>> Initiating the shutdown command via a terminal session or ssh still
>> fails (nbd-disconnect is not called). Is there a way to cleanly shutdown
>> the client via ssh? - Or - clean up the server connections, swap files,
>> etc... after a more aggressive shutdown (since the ssh shutdown will be
>> initiated from the server anyway).
>>
>
>
>
> First, try plain `poweroff` from root at tty1. It should "just work".
> Then go on with trying `poweroff` from root at ssh_connection. That should
> work, even if you do it from an ssh connection.
>
> Don't use `shutdown` as in some versions it means "halt but don't poweroff
> the system".
>
> If you're still having problems, ensure that you have reverted all of your
> local changes to `poweroff` (script wrapper etc).
>
> BTW, because some people still suggest `poweroff -fp`, let me mention that:
>  * it leaves the ssh connections open
>  * it leaves the nbd connections open
>  * the swap files on the server don't get deleted
>  * in 3.13+ kernels, the nbd-server process for that client hangs,
>    and that client then can't boot again for some time.
>
> That's why nbd-disconnect was implemented, to bypass problems caused by
> `poweroff -fp`. It was just not triggered in 12.04 because we changed the
> LTSP /proc/cmdline without updating nbd-disconnect.
>
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