This segfault occurs when file '/etc/iceweasel/iceweaselrc' sets
environment variable 'ICEWEASEL_DSP' to 'padsp', which then
executes 'firefox-bin'.  When running the script in verbose
mode we see:

        iceweasel --verbose -new-tab http://bugs.debian.org
        ICEWEASEL_DSP=padsp
        APPLICATION_ID=iceweasel
        CMDLINE_DISPLAY=
        DISPLAY=:0.0
        OPTIONS=-a iceweasel -new-tab http://bugs.debian.org
        DEBUG=0
        DEBUGGER=
        MOZ_DISABLE_PANGO=
        MOZ_NO_REMOTE=
        Running: padsp /usr/lib/iceweasel/firefox-bin -a iceweasel              
-new-tab
http://bugs.debian.org
        Segmentation fault (core dumped)

After setting 'ICEWEASEL_DSP' back to "none", there is no 
segfault.  Also, if we do:

        gnome-open http://bugs.debian.org

the page is opened in a new tab with no segfault.  The
odd thing is I am sure I didn't modify 'iceweaselrc'
recently, and the links in update-manager had been 
behaving properly.  

I will try to click on links in update-notifier/manager
tomorrow at daily maintenance time to test this.
Also, I will run an strace on the padsp invocation
of firefox-bin to try and see why the segfault is being caused.




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