[Bug 946718] Re: backend_helper.py crashed with RuntimeError in add_signal_receiver(): To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)

[Michael Terry]

I've uploaded a fix to precise-proposed and adjusted the description for
SRU requirements.

** Description changed:

- Crashing when attempting to update applications.
+ [Impact]
+ This is one of the top-reported bugs on error.ubuntu.com.  It seems to occur when you've inserted an Ubuntu CD and started the package manager.
  
- ProblemType: Crash
- DistroRelease: Ubuntu 12.04
- Package: update-notifier-common 0.118.1ubuntu1
- ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
- Uname: Linux 3.2.0-17-generic x86_64
- ApportVersion: 1.94-0ubuntu1
- Architecture: amd64
- CasperVersion: 1.305
- Date: Sun Mar  4 23:23:52 2012
- ExecutablePath: /usr/lib/update-notifier/backend_helper.py
- InterpreterPath: /usr/bin/python2.7
- LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120304)
- PackageArchitecture: all
- ProcCmdline: /usr/bin/python /usr/lib/update-notifier/backend_helper.py add_cdrom /media/Ubuntu\ 11.10\ i386
- ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
- PythonArgs: ['/usr/lib/update-notifier/backend_helper.py', 'add_cdrom', '/media/Ubuntu 11.10 i386']
- SourcePackage: update-notifier
- Title: backend_helper.py crashed with RuntimeError in add_signal_receiver(): To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)
- UpgradeStatus: No upgrade log present (probably fresh install)
- UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
+ [Test Case]
+ sudo apt-get remove synaptic
+ /usr/lib/update-notifier/backend_helper.py add_cdrom test
+ 
+ [Regression Potential]
+ I think very low.  The only affected code path is right before this crashes unconditionally anyway.  So even if this screws something up, it can't make it worse.  We import a module from python-dbus, but we already were using python-dbus, so dependencies and module use aren't changing.

** Changed in: update-notifier (Ubuntu Precise)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/946718

Title:
  backend_helper.py crashed with RuntimeError in add_signal_receiver():
  To make asynchronous calls, receive signals or export objects, D-Bus
  connections must be attached to a main loop by passing mainloop=... to
  the constructor or calling dbus.set_default_main_loop(...)

Status in “update-notifier” package in Ubuntu:
  Fix Released
Status in “update-notifier” source package in Precise:
  In Progress

Bug description:
  [Impact]
  This is one of the top-reported bugs on error.ubuntu.com.  It seems to occur when you've inserted an Ubuntu CD and started the package manager.

  [Test Case]
  sudo apt-get remove synaptic
  /usr/lib/update-notifier/backend_helper.py add_cdrom test

  [Regression Potential]
  I think very low.  The only affected code path is right before this crashes unconditionally anyway.  So even if this screws something up, it can't make it worse.  We import a module from python-dbus, but we already were using python-dbus, so dependencies and module use aren't changing.

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