Public bug reported:

Some users' processes aren't being killed on logout. Users' processes
are also not killed on a XServer reset (ctrl+alt+backspace) and unless
an admin kills their processes manually they cannot log in.

Unfortunately, if they log in again before an administrator manually
kills the processes with killall -u, there are lots of gnome errors
about previous sockets and stale files, and the desktop is unusable.

In the below instance, the user 'mlewus' logged in and tried to start
Firefox. She was notified that 'firefox is still running. Shut down the
current session before starting a new one'. She logged out with the
System->Log out, clicked 'Log out' on the popup prompt, and was
presented with a locked desktop screen, complete with panel & icons for
a period of ~2 minutes. After about 2 minutes, she was returned to LDM.
I then checked the server and found these:

[EMAIL PROTECTED]:/etc/cups# lsb_release -rd
Description:    Ubuntu 8.04
Release:        8.04

[EMAIL PROTECTED]:/etc/cups# ps auxw |grep mlewus
mlewus   17126  0.3  0.5 168384 47464 ?        Sl   10:54   0:02 
/usr/lib/firefox-3.0b5/firefox
mlewus   17598  0.0  0.0   5276  2192 ?        S    11:04   0:00 
/usr/lib/libgconf2-4/gconfd-2 12
root     17709  0.0  0.0   3008   796 pts/1    S+   11:05   0:00 grep mlewus

In order to remove the processes I had to kill -9 them. The user could
then log in without difficulty.

** Affects: ltsp (Ubuntu)
     Importance: Undecided
         Status: New

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processes not killed on logout
https://bugs.launchpad.net/bugs/232532
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