dbus-daemon consumes 100% cpu after login

Bug #1176481 reported by subramaniajeeva@gmail.com on 2013-05-05
This bug affects 11 people
Affects Status Importance Assigned to Milestone
dbus (Ubuntu)

Bug Description

Ubuntu version : 13.04
Architecture : x86_64
Problem in : gnome-classic
  Installed: 1.6.8-1ubuntu6
  Candidate: 1.6.8-1ubuntu6
  Version table:
 *** 1.6.8-1ubuntu6 0
        500 http://in.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

Frequent problems with dbus-daemon entering a runaway state, consuming 100% of one core for extended durations. KDE applications fail to open or react in a timely manner while this is happening. Couldn't open firefox, terminal, system monitor, vlc, gedit , etc...
Previously, I've been using 32 bit ubuntu with no problems (ever). This problem is there since I installed ubuntu 13.04.

Reproducible: Yes

Steps to Reproduce: Seems linked to login duration, running KDE apps (or dbus enabled apps) include: Firefox, Network Manager.

Actual Results: One core at sustained 97(+)% cpu. dbus-daemon highest process in "top" output. Killing dbus-daemon clears CPU utilization, but then all KDE and dbus applications(like firefox, nautilus, network manager applet) fail to run until restart.

Expected Results: dbus-daemon should not runaway.

ps -ef output for dbus-daemon process:

102 974 1 0 08:34 ? 00:00:00 dbus-daemon --system --fork
jeeva 1866 1 31 08:34 ? 00:25:22 //bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session
jeeva 1880 1876 0 08:34 ? 00:00:00 /bin/dbus-daemon --config-file=/etc/at-spi2/accessibility.conf --nofork --print-address 3

description: updated
Sebastien Bacher (seb128) wrote :

Thanks for the bug report, why do you think dbus using cpu is a lightdm issue? One reason of the cpu usage could be that a client is "spamming" the bus, is there high activity reported on the bus by dbus-monitor when that happens?

Changed in lightdm (Ubuntu):
importance: Undecided → Low
affects: gdm (Ubuntu) → ubuntu

I'm Sorry to put this bug under lightdm. I tried to put the package as dbus. It didn't workout. so, I clicked the option "I don't know the package". It automatically took it as lightdm.

Also I get some problem with login screen. Sometimes the login text box became very large. Not only that the whole screen, font, panel everything is becoming very large. I try to shut down the system. It is not shutting down. Is this bug related to lightdm?

affects: lightdm (Ubuntu) → edbus (Ubuntu)
papukaija (papukaija) on 2013-05-27
affects: edbus (Ubuntu) → dbus (Ubuntu)
Changed in ubuntu:
status: New → Invalid
tags: added: amd64
summary: - dbus-daemon consumes 100% cpu after login in ubuntu 13.04
+ dbus-daemon consumes 100% cpu after login
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in dbus (Ubuntu):
status: New → Confirmed
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