[Bug 186266] New: zombie processes after login prevent logout later

[Kai Krakow]

https://bugs.kde.org/show_bug.cgi?id=186266

           Summary: zombie processes after login prevent logout later
           Product: kde
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: kai at kaishome.de


Version:            (using KDE 4.2.0)
Compiler:          gcc-Version 4.1.2 (Gentoo 4.1.2 p1.0.2) 
OS:                Linux
Installed from:    Gentoo Packages

Shortly I upgraded to qt-4.5-rc1 and the latest nvidia driver. Since then when
logging in to KDE several zombie processes show up directly after login. I
suppose this prevents me from logging out (I have to switch to the console and
hit ctrl+alt+del to get rid of these).

This happened to KDE 4.1.3 with qt-4.5-rc1 and I ignored it because I ran
qt-rc. I now upgraded to KDE 4.2.0 final with qt-4.5 final. The problem
persists. I doesn't seem to harm my session, everything is working. But trying
to logout, the desktop becomes stuck.

I'm not sure if this is related to the upgrade of my nvidia-driver to
180.29/.35 (tried both) or due to the upgrade to qt-4.5.

It's reproducable on several machines, may they run x86 or amd64. The affected
machines are Athlon amd64 and P4-HT x86, both running identical versions of
KDE, qt and nvidia-drivers.

Here's my ps grep:

kakra at jupiter ~ $ ps axuw|grep Z
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kakra     4316  0.0  0.0      0     0 ?        Z    Mar03   0:01 [krunner_lock]
<defunct>
kakra    19055  0.0  0.0      0     0 ?        Z    Mar03   0:00
[nepomukserver] <defunct>
kakra    19064  0.0  0.0      0     0 ?        Z    Mar03   0:00
[nepomukservices] <defunct>
kakra    19072  0.0  0.0      0     0 ?        Z    Mar03   0:00 [kgpg]
<defunct>
kakra    19081  0.0  0.0      0     0 ?        Z    Mar03   0:00 [akonaditray]
<defunct>
kakra    19084  0.0  0.0      0     0 ?        Z    Mar03   0:00 [gpg]
<defunct>
kakra    19085  0.0  0.0      0     0 ?        Z    Mar03   0:00 [kmix]
<defunct>
kakra    19087  0.0  0.0      0     0 ?        Z    Mar03   2:00 [skype]
<defunct>
kakra    19103  0.0  0.0      0     0 ?        Z    Mar03   0:00 [kopete]
<defunct>
kakra    19135  0.0  0.0      0     0 ?        Z    Mar03   0:00
[nvidia-settings] <defunct>
kakra    26452  0.0  0.0   3928   880 pts/0    S+   21:19   0:00 grep
--colour=auto Z

Killing the parent of these processes leads to a plain white screen when
killing ksmserver with the machine completely hung (no switch to console
possible). Only way to do a clean reboot is to not logout but instead switch to
console and ctrl+alt+del the system.

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