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List:       kde-bugs-dist
Subject:    [Network Management] [Bug 324954] New: kded4 leak sockets when wifi  connections fail
From:       Petter Reinholdtsen <pere () hungry ! com>
Date:       2013-09-16 11:39:12
Message-ID: bug-324954-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=324954

            Bug ID: 324954
           Summary: kded4 leak sockets when wifi         connections fail
    Classification: Unclassified
           Product: Network Management
           Version: 0.9
          Platform: Debian stable
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: Plasma Widget
          Assignee: lamarque@kde.org
          Reporter: pere@hungry.com
                CC: jgrulich@redhat.com, wstephenson@kde.org

Package: plasma-widget-networkmanagement
Version: 0.9.0.3-1
Severity: important
Tags: upstream

Dear Maintainer,

My KDE desktop based on Debian Wheezy is unstable.  After a few days,
the KDE panel stop working properly, and I have to log out and in
again to get back to work.  Clicking on the K menu do not have any
effect until 20-60 seconds later, and the icons like the battery and
network status are unresposive, with similar delays from mouse clicks.

I believe I tracked down the cause, which is that kded4 is running out
of file descriptors because it is leaking sockets.  When the problem
happen, the process have above 1020 files open.

With 23010 as the pid of kded4, I used this one-liner to to track the
number of open files and the distribution across different types:

  ls -l /proc/23010/fd|wc -l ; ls -l /proc/23010/fd|rev|cut -d\[ -f2|awk
'{print
+$1}'|rev|sort|uniq -c

It show that approximately 2.5 sockets are leaked per minute at the
moment.

With the good help of pinotree on #debian-kde, I was able to find the
most likely part responsible, and it seem to be the "NetworkManager
User Settings service" available in the System Settings->Startup and
Shutdown->Service Manager menu.  When I disable it (and run kdeinit4
to make sure the change take effect), the number of open sockets
stopped increasing.  When I enable it again, the number of open
sockets start to increase.

When I now had an idea about the affected system, I tried to disable
wifi using the check box in the network-manager control panel, and the
number of open sockets stayed stable again.

Where I am at the moment, I use TP ethernet, and while there are
several wifi networks around, non of them are really working for me.
But I do notice network-manager try to connect over and over again to
a few of them.

This make me suspect that the plasma-widget-networkmanagement code
fail to close some socket when connecting to a wifi network fail.

This problem was also reported to Debian as http://bugs.debian.org/723092 .

Reproducible: Always

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