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Bug#890517: killer's CRON logs out users once per hour

On Thu, Feb 15, 2018 at 03:21:41PM +0000, Mike Gabriel wrote:
> On  Do 15 Feb 2018 15:23:46 CET, Petter Reinholdtsen wrote:
> > [Mike Gabriel]
> > > We never came to the point to investigate this closer, but personally,
> > > I think that killer on a Debian Edu system with MATE desktop env has
> > > not been usable at least since jessie.

I'm unable to reproduce the reported issue (Debian Edu Jessie, Stretch, 
Buster; tested LightDM, GDM, SDDM).

> > The only way I can think of that this can happen, is if the display
> > manager is broken and fail to register logged in users in the utmp/wtmp
> > files.  You can verify this by running 'w' or 'who' after login to see
> > if the user is registered as logged in.  If this is the case, the fatal
> > bug is in the login service you are using, not killer.
> Output of "who" looks good, if MATE gets launched locally (vt7). Display
> Manager is LightDM with Arctica Greeter on top.

> However, I noticed that X2Go does not register the logged in user in
> utmp/wtmp.
Mike, could you provide some details?

IIRC, for connections to a system that runs Nomachine technology (not 
part of Debian) the utmp/wtmp files are not used by design (on the 
system running NX server). Instead, NX keeps track of the 
forwarded sessions itself.

IMO killer shouldn't be installed on a system running NX technology 
because the reported failure will show up for sure.

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