Bug#783098: [iceweasel] Fully uses one CPU core

[Philipp Klaus Krause]

Package: iceweasel
Version: 31.6.0esr-1
Severity: important

--- Please enter the report below this line. ---

It is well known that iceweasel / firefox often fully uses one CPU core
when a page is being displayed (see all the bug reports here and
upstream). I am used to it. However, recently, I see it fully use a CPU
core and continuing to do so, even when I close all tabs or close it.
To reproduce: Start iceweasel, open some pages, wait for some time
uintil it starts fully using a CPU core, then close all tabs. It still
fully uses a core. When I close it (using the 'x' from the window
manager), the process still fully uses a core. Sending a TERM signal
using kill works though.

--- System information. ---
Architecture: amd64
Kernel:       Linux 3.16.0-4-amd64

Debian Release: 8.0
  500 unstable        ftp.de.debian.org
  500 testing         ftp.de.debian.org
    1 experimental    ftp.de.debian.org

--- Package information. ---
Depends                               (Version) | Installed
===============================================-+-===================
libasound2                          (>= 1.0.16) |
libatk1.0-0                         (>= 1.12.4) |
libc6                                 (>= 2.17) |
libcairo2                            (>= 1.2.4) |
libdbus-1-3                          (>= 1.0.2) |
libdbus-glib-1-2                      (>= 0.78) |
libevent-2.0-5               (>= 2.0.10-stable) |
libffi6                              (>= 3.0.4) |
libfontconfig1                        (>= 2.11) |
libfreetype6                         (>= 2.2.1) |
libgcc1                            (>= 1:4.1.1) |
libgdk-pixbuf2.0-0                  (>= 2.22.0) |
libglib2.0-0                        (>= 2.37.3) |
libgtk2.0-0                         (>= 2.24.0) |
libhunspell-1.3-0                    (>= 1.3.3) |
libnspr4                          (>= 2:4.10.3) |
libnss3                             (>= 2:3.16) |
libpango-1.0-0                      (>= 1.14.0) |
libsqlite3-0                     (>= 3.7.12-1~) |
libstartup-notification0               (>= 0.8) |
libstdc++6                             (>= 4.9) |
libvpx1                              (>= 1.3.0) |
libx11-6                                        |
libxext6                                        |
libxrender1                                     |
libxt6                                          |
zlib1g                             (>= 1:1.2.0) |
fontconfig                                      |
procps                                          |
debianutils                           (>= 1.16) |


Package's Recommends field is empty.

Suggests                   (Version) | Installed
====================================-+-===========
fonts-stix                           | 1.1.1-1
 OR otf-stix                         |
fonts-oflb-asana-math                | 000.907-6
fonts-mathjax                        |
mozplugger                           |
libgssapi-krb5-2                     | 1.12.1+dfsg-19
 OR libkrb53                         |
libgnomeui-0                         | 2.24.5-3
libcanberra0                         | 0.30-2.1



--- Output from package bug script ---

-- Extensions information
Name: Close last tab with middle-click
Location: /jid0-a81mUWfvwz11vbNMBHAUSUnstxR at jetpack.xpi
Status: enabled

Name: Default theme
Location:
/usr/lib/iceweasel/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}
Package: iceweasel
Status: enabled

-- Plugins information
Name: IcedTea-Web Plugin (using IcedTea-Web 1.5 (1.5-2+deb8u1))
Location: /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
Package: icedtea-7-plugin:amd64
Status: enabled


-- Addons package information
ii  icedtea-7-plug 1.5-2+deb8u1 amd64        web browser plugin based on
OpenJ
ii  iceweasel      31.6.0esr-1  amd64        Web browser based on Firefox