Bug#591106: iceweasel: Iceweasel freezes X when zooming on large images

[John Aston]

Package: iceweasel
Version: 3.5.10-1
Severity: important


I have a two-screen (in the Xorg.conf sense) configuration.  If I have a large
image displayed in zoomed-out mode and attempt to zoom in on it, the browser
often takes a few seconds to re-render.  If I move my mouse pointer to the other
screen during this re-rendering process, X freezes entirely and accepts no further
input, including attempts to switch to a virtual console to kill iceweasel.  The
only solution is to shut down the entire machine with the power button.

This happens with (at least) large GIFs and JPEGs.  An example image which causes
this behavior is http://upload.wikimedia.org/wikipedia/commons/e/ef/Quietdunes.jpg.

If the image is not in the process of re-rendering, meaning that it is fully zoomed
in or out, there are no problems.  It only freezes when I move the mouse onto the 
other screen during the re-rendering process.

-- Package-specific info:

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

-- Plugins information
Name: IcedTea NPR Web Browser Plugin (using IcedTea6 1.8 (6b18-1.8-1))
Location: /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/IcedTeaPlugin.so
Package: icedtea6-plugin
Status: enabled


-- Addons package information
ii  icedtea6-plugi 6b18-1.8-1     web browser plugin based on OpenJDK and Iced
ii  iceweasel      3.5.10-1       Web browser based on Firefox

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (100, 'stable'), (50, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages iceweasel depends on:
ii  debianutils                   3.4        Miscellaneous utilities specific t
ii  fontconfig                    2.8.0-2.1  generic font configuration library
ii  libc6                         2.11.2-2   Embedded GNU C Library: Shared lib
ii  libglib2.0-0                  2.24.1-1   The GLib library of C routines
ii  libgtk2.0-0                   2.20.1-1   The GTK+ graphical user interface 
ii  libnspr4-0d                   4.8.4-2    NetScape Portable Runtime Library
ii  libstdc++6                    4.4.4-7    The GNU Standard C++ Library v3
ii  procps                        1:3.2.8-9  /proc file system utilities
ii  xulrunner-1.9.1               1.9.1.10-1 XUL + XPCOM application runner

iceweasel recommends no packages.

Versions of packages iceweasel suggests:
ii  libgssapi-krb5-2            1.8.1+dfsg-5 MIT Kerberos runtime libraries - k
pn  mozplugger                  <none>       (no description available)
pn  ttf-lyx | latex-xft-fonts   <none>       (no description available)
pn  ttf-mathematica4.1          <none>       (no description available)
pn  xfonts-mathml               <none>       (no description available)
pn  xprint                      <none>       (no description available)

Versions of packages xulrunner-1.9.1 depends on:
ii  libasound2              1.0.23-1         shared library for ALSA applicatio
ii  libatk1.0-0             1.30.0-1         The ATK accessibility toolkit
ii  libbz2-1.0              1.0.5-4          high-quality block-sorting file co
ii  libc6                   2.11.2-2         Embedded GNU C Library: Shared lib
ii  libcairo2               1.8.10-4         The Cairo 2D vector graphics libra
ii  libdbus-1-3             1.2.24-1         simple interprocess messaging syst
ii  libfontconfig1          2.8.0-2.1        generic font configuration library
ii  libfreetype6            2.4.0-2          FreeType 2 font engine, shared lib
ii  libgcc1                 1:4.4.4-7        GCC support library
ii  libglib2.0-0            2.24.1-1         The GLib library of C routines
ii  libgtk2.0-0             2.20.1-1         The GTK+ graphical user interface 
ii  libhunspell-1.2-0       1.2.11-1         spell checker and morphological an
ii  libjpeg62               6b1-1            The Independent JPEG Group's JPEG 
ii  libmozjs2d              1.9.1.10-1       The Mozilla SpiderMonkey JavaScrip
ii  libnspr4-0d             4.8.4-2          NetScape Portable Runtime Library
ii  libnss3-1d              3.12.6-3         Network Security Service libraries
ii  libpango1.0-0           1.28.1-1         Layout and rendering of internatio
ii  libpng12-0              1.2.44-1         PNG library - runtime
ii  libreadline6            6.1-3            GNU readline and history libraries
ii  libsqlite3-0            3.6.23.1-4       SQLite 3 shared library
ii  libstartup-notification 0.10-1           library for program launch feedbac
ii  libstdc++6              4.4.4-7          The GNU Standard C++ Library v3
ii  libx11-6                2:1.3.3-3        X11 client-side library
ii  libxrender1             1:0.9.6-1        X Rendering Extension client libra
ii  libxt6                  1:1.0.7-1        X11 toolkit intrinsics library
ii  zlib1g                  1:1.2.3.4.dfsg-3 compression library - runtime

-- no debconf information