Thanks for the nice summary Steve. I dropped the nice in
http://bazaar.launchpad.net/~apport-hackers/apport/trunk/revision/3003 .
It might certainly improve things a bit, but if it takes long now it
will still take long with this; this is a little optimization, not
really a complete solution.

We discussed some other approaches: the unity compositor could install a
signal handler for SIGSEGV, and if it encounters a crash, release all
its video buffers, and re-raise the signal. This could help a lot
already, as presumably the mmapped video memory takes the majority of
the core dumped area. This should be confirmed by experiments, though.

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https://bugs.launchpad.net/bugs/1278780

Title:
  apport takes too long to write crash report, appears to lock up phone

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