I thought the apport automatic uploads included more information, like
lshw & lsmod outputs.

A possibly significant detail occurred to me about my duplicate of this issue 
(bug 329013); I
wanted to check if the same was true of the others.

My system that has the problem has no audio hardware.  PC Speaker is
all.  [it has an SB16-ish clone that isn't being recognized.]  When
Mixer is working it has only "Master" volume; when I open the full Mixer
UI it shows only two audio "devices", a Null Source and a Null Sink.

So maybe it's crashing due to assuming at least one non-null audio
device is present.

To duplicate on system with working sound hardware (general idea -- not
tested by me):

  sudo 'echo "blacklist snd" > /etc/modprobe.d/local-blacklist'
 
then reboot.  You might need a different point of leverage in the sound stack, 
I haven't explored.  _Might_ be sufficient to unload sound drivers when already 
running -- but only if that causes Mixer [via HAL?]
to forget about the hardware; and then only if it leaves Mixer in the bad 
state.  Try:

  lsmod | awk '/snd/ { print $1}' | sudo xargs rmmod

[not recommended unless you're comfortable with module hackery &
prepared for a possible system crash...]

-- 
xfce4-mixer-plugin crashed with SIGSEGV in free()
https://bugs.launchpad.net/bugs/326441
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