[LightDM] [systemd-devel] sd 221 regression: login - nonexistent sessions via lightdm

[David Herrmann]

Hi

On Tue, Jul 7, 2015 at 7:10 PM, David Herrmann <dh.herrmann at gmail.com> wrote:
> Hi
>
> On Tue, Jul 7, 2015 at 6:55 PM, Martin Pitt <martin.pitt at ubuntu.com> wrote:
>> Hey David,
>>
>> David Herrmann [2015-07-07 18:31 +0200]:
>>> > Revert "login: re-use VT-sessions if they already exist" - commit 0204c4b
>>> > http://cgit.freedesktop.org/systemd/systemd/commit/?id=0204c4b
>>>
>>> Can someone elaborate what exactly lightdm does here? We really want
>>> to prevent multiple sessions on the same VT. This is just nasty and
>>> never made any sense. So I'm really interested why lightdm doesn't
>>> kill it's manager-session before it starts the new session. Any
>>> particular reason here?
>>
>> I'll let Robert answer with the details, but something I noticed:
>>
>> It's not that simple to reproduce, but sometimes it seems the lightdm
>> "greeter" session (running as user lightdm, where you select user/type
>> password and so on) doesn't completely terminate, but some processes
>> stay around in it. Thus the greeter session stays around in state
>> "Closing", and then the "real" session starts on the same VT.
>>
>> I asked the reporter of https://launchpad.net/bugs/1472259 to attach
>> systemd-cgls, so that we can see what's running in the session.
>
> So it might indeed just be a race in lightdm. Hmm..
> Anyway, this patch here should also fix the issue (if it does, I'll
> commit something proper).

Ok, I pushed this to -git now. Should be fixed. Can you guys verify?

Thanks
David