gnome-shell 100% cpu usage

[Jens Askengren]

About once a day Gnome shell starts to use 100% cpu and continues to do so until the shell is restarted.

I hope this bug report contains a stack track to identify the offending function.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gnome-shell 3.16.2-0ubuntu1~vivid1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
Uname: Linux 3.19.0-20-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Jun 15 09:57:40 2015
DisplayManager: gdm
InstallationDate: Installed on 2015-05-22 (23 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)