[Bug 1577132] [NEW] dbus/upstart spam dbus with NameOwnerChanged

[Michał Sawicz]

Public bug reported:

After upgrading to latest overlay (unfortunately there's about 150
packages to upgrade between the last image and overlay) dbus-monitor
shows dbus/upstart spamming system dbus with NameOwnerChanged signals -
there's no crash files or anything, but the top of top looks like so:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 2921 phablet   20   0 1164048 277924   7444 S  34,9 28,3   4:18.54 ubuntu-push-cli
  847 message+  20   0    6412   2444    832 R  32,9  0,2   3:43.92 dbus-daemon
 2255 phablet   20   0    7080   2172   1156 R  22,2  0,2   2:40.95 upstart
 2592 phablet   20   0   33704   4848   4140 R  17,6  0,5   1:52.28 mission-control

dbus-monitor shows hundreds of events like so:

signal time=1462098650.817539 sender=:1.0 -> destination=(null destination) serial=11224 path=/com/ubuntu/Upstart; interface=com.ubuntu.Upstart0_6; member=EventEmitted
   string "dbus"
   array [
      string "SIGNAL=NameOwnerChanged"
      string "BUS=session"
      string "INTERFACE=org.freedesktop.DBus"
      string "OBJPATH=/org/freedesktop/DBus"
      string "SENDER=org.freedesktop.DBus"
      string "ARG0=:1.167"
      string "ARG1="
      string "ARG2=:1.167"
   ]

3s of dbus-monitor:

$ time dbus-monitor > dbus.log
^C
real    0m2.719s

Shows 226 signals - so it's just under 100 signals a second:

$ grep -c NameOwnerChanged dbus.log 
226

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: dbus 1.8.12-1ubuntu5
Uname: Linux 3.4.67 armv7l
ApportVersion: 2.17.2-0ubuntu1.3touch1
Architecture: armhf
Date: Sun May  1 12:22:38 2016
InstallationDate: Installed on 2016-04-29 (2 days ago)
InstallationMedia: Ubuntu 15.04 - armhf (20160429-020305)
SourcePackage: dbus
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: canonical-devices-system-image
     Importance: Undecided
         Status: New

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


** Tags: apport-bug armhf third-party-packages vivid

** Also affects: canonical-devices-system-image
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to dbus in Ubuntu.
https://bugs.launchpad.net/bugs/1577132

Title:
  dbus/upstart spam dbus with NameOwnerChanged

Status in Canonical System Image:
  New
Status in dbus package in Ubuntu:
  New

Bug description:
  After upgrading to latest overlay (unfortunately there's about 150
  packages to upgrade between the last image and overlay) dbus-monitor
  shows dbus/upstart spamming system dbus with NameOwnerChanged signals
  - there's no crash files or anything, but the top of top looks like
  so:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
   2921 phablet   20   0 1164048 277924   7444 S  34,9 28,3   4:18.54 ubuntu-push-cli
    847 message+  20   0    6412   2444    832 R  32,9  0,2   3:43.92 dbus-daemon
   2255 phablet   20   0    7080   2172   1156 R  22,2  0,2   2:40.95 upstart
   2592 phablet   20   0   33704   4848   4140 R  17,6  0,5   1:52.28 mission-control

  dbus-monitor shows hundreds of events like so:

  signal time=1462098650.817539 sender=:1.0 -> destination=(null destination) serial=11224 path=/com/ubuntu/Upstart; interface=com.ubuntu.Upstart0_6; member=EventEmitted
     string "dbus"
     array [
        string "SIGNAL=NameOwnerChanged"
        string "BUS=session"
        string "INTERFACE=org.freedesktop.DBus"
        string "OBJPATH=/org/freedesktop/DBus"
        string "SENDER=org.freedesktop.DBus"
        string "ARG0=:1.167"
        string "ARG1="
        string "ARG2=:1.167"
     ]

  3s of dbus-monitor:

  $ time dbus-monitor > dbus.log
  ^C
  real    0m2.719s

  Shows 226 signals - so it's just under 100 signals a second:

  $ grep -c NameOwnerChanged dbus.log 
  226

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: dbus 1.8.12-1ubuntu5
  Uname: Linux 3.4.67 armv7l
  ApportVersion: 2.17.2-0ubuntu1.3touch1
  Architecture: armhf
  Date: Sun May  1 12:22:38 2016
  InstallationDate: Installed on 2016-04-29 (2 days ago)
  InstallationMedia: Ubuntu 15.04 - armhf (20160429-020305)
  SourcePackage: dbus
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1577132/+subscriptions