Bug#767012: iceweasel fails to close and keeps running in background

[Martin Erik Werner]

Package: iceweasel
Version: 31.4.0esr-1

I'm also experiencing symptoms very similar to what's described here,
but with a few differences.

I usually run two iceweasel profiles in parallel, profile "A" is a
"normal usage" profile (the one given in the package information below),
profile B is a "media usage" profile (used with -no-remote & -profile).

Very often, seemingly at random after some time of usage or inactivity,
profile A will start using 100% CPU, and when closing this iceweasel
instance the behaviour stays unchanged until a SIGTERM is sent to the
process, which causes the process to exit. Profile B remains unaffected during
this.

I have never observed this behaviour with profile B, and it doesn't seem
to be an interaction issue since it occurs even when only profile A is running.

I'm currently suspecting it might be a specific site element or
something which triggers it (since profiles A & B are not particularly
different, but are commonly used for different sites), but I've yet
been unable to narrow it down at all


-- Package-specific info:

-- Extensions information
Name: Adblock Plus
Location: /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Package: xul-ext-adblock-plus
Status: user-disabled

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

Name: English (GB) Language Pack locale
Location: /usr/lib/iceweasel/browser/extensions/langpack-en-GB at iceweasel.mozilla.org.xpi
Package: iceweasel-l10n-en-gb
Status: enabled

Name: GNOME Keyring integration
Location: /usr/lib/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/{6f9d85e0-794d-11dd-ad8b-0800200c9a66}
Package: xul-ext-gnome-keyring
Status: enabled

Name: Lazarus: Form Recovery
Location: ${PROFILE_EXTENSIONS}/lazarus at interclue.com.xpi
Status: enabled

-- Plugins information
Name: Gnome Shell Integration
Location: /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so
Package: gnome-shell
Status: enabled

Name: IcedTea-Web Plugin (using IcedTea-Web 1.5.2 (1.5.2-1))
Location: /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
Package: icedtea-7-plugin:amd64
Status: enabled

Name: iTunes Application Detector
Location: /usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so
Package: rhythmbox-plugins
Status: enabled

Name: Shockwave Flash (11.2.202.425)
Location: /usr/lib/flashplugin-nonfree/libflashplayer.so
Status: enabled


-- Addons package information
ii  gnome-shell    3.14.2-3+b1  amd64        graphical shell for the GNOME des
ii  icedtea-7-plug 1.5.2-1      amd64        web browser plugin based on OpenJ
ii  iceweasel      31.4.0esr-1  amd64        Web browser based on Firefox
ii  iceweasel-l10n 1:31.4.0esr- all          English (United Kingdom) language
ii  rhythmbox-plug 3.1-1        amd64        plugins for rhythmbox music playe
ii  xul-ext-adbloc 2.6.6+dfsg-1 all          advertisement blocking extension 
ii  xul-ext-gnome- 0.6.11-3     amd64        Store mozilla passwords in GNOME 

-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages iceweasel depends on:
ii  debianutils               4.4+b1
ii  fontconfig                2.11.0-6.3
ii  libasound2                1.0.28-1
ii  libatk1.0-0               2.14.0-1
ii  libc6                     2.19-13
ii  libcairo2                 1.14.0-2.1
ii  libdbus-1-3               1.8.14-1
ii  libdbus-glib-1-2          0.102-1
ii  libevent-2.0-5            2.0.21-stable-2
ii  libffi6                   3.1-2+b2
ii  libfontconfig1            2.11.0-6.3
ii  libfreetype6              2.5.2-2
ii  libgcc1                   1:4.9.2-10
ii  libgdk-pixbuf2.0-0        2.31.1-2+b1
ii  libglib2.0-0              2.42.1-1
ii  libgtk2.0-0               2.24.25-1
ii  libhunspell-1.3-0         1.3.3-3
ii  libnspr4                  2:4.10.7-1
ii  libnss3                   2:3.17.2-1.1
ii  libpango-1.0-0            1.36.8-3
ii  libsqlite3-0              3.8.7.4-1
ii  libstartup-notification0  0.12-4
ii  libstdc++6                4.9.2-10
ii  libvpx1                   1.3.0-3
ii  libx11-6                  2:1.6.2-3
ii  libxext6                  2:1.3.3-1
ii  libxrender1               1:0.9.8-1+b1
ii  libxt6                    1:1.1.4-1+b1
ii  procps                    2:3.3.9-8
ii  zlib1g                    1:1.2.8.dfsg-2+b1

iceweasel recommends no packages.

Versions of packages iceweasel suggests:
pn  fonts-mathjax          <none>
pn  fonts-oflb-asana-math  <none>
ii  fonts-stix [otf-stix]  1.1.1-1
ii  libcanberra0           0.30-2.1
ii  libgnomeui-0           2.24.5-3
ii  libgssapi-krb5-2       1.12.1+dfsg-16
pn  mozplugger             <none>

-- no debconf information