Comment # 24 on bug 931964 from Thomas Blume

(In reply to Roland Bernet from comment #23)
> ps aux | grep sd-pam   gives
> 
> emeier    1195  0.0  0.1  75572  2132 ?        S    Jun09   0:00 (sd-pam)  
> root      1520  0.0  0.0  75572  1928 ?        S    Jun09   0:00 (sd-pam)  
> pcapelo   8336  0.0  0.1  75600  2236 ?        S    10:07   0:00 (sd-pam)  
> mariusw   8493  0.0  0.1  75572  2136 ?        S    Jun09   0:00 (sd-pam)  
> bernet    8818  0.0  0.1  75588  2228 ?        S    11:01   0:00 (sd-pam)  
> lmayer   14697  0.0  0.1  75572  2056 ?        S    Jun09   0:00 (sd-pam)  
> torriell 15992  0.0  0.1  75596  2160 ?        S    Jun10   0:00 (sd-pam)  
> psaha    24778  0.0  0.1  75572  2076 ?        S    Jun09   0:00 (sd-pam)  
> irshad   25205  0.0  0.1  75572  2092 ?        S    Jun09   0:00 (sd-pam)  
> pires    27092  0.0  0.1  75572  2104 ?        S    Jun09   0:00 (sd-pam)  
> tgoerdt  27975  0.0  0.1  75588  2216 ?        S    Jun10   0:00 (sd-pam)  
> novati   31556  0.0  0.1  75572  2124 ?        S    Jun09   0:00 (sd-pam)

If there are no user processes that should persist after user logout, you can
set:

KillUserProcesses=yes

in /etc/systemd/logind.conf

But please be aware that this would also kill, for example, a detached screen
session at user logout.