Just posting information on the fix.  This bug affected me as well.
However it was not with the POWER_SUPPLY_MODEL_NAME.  Every time I would
unplug and plugin my laptop I would get 100% CPU usage from upstart-
udev-bridge.

The garbage characters are in the value of the model name for this Sanyo
battery.

0003760 012 120 117 127 105 122 137 123 125 120 120 114 131 137 115 117
         \n   P   O   W   E   R   _   S   U   P   P   L   Y   _   M   O
0004000 104 105 114 137 116 101 115 105 075 060 021 060 052 171 206 012
          D   E   L   _   N   A   M   E   =   0 021   0   *   y 206  \n

I have applied the fix and restarted upstart-udev-bridge and the issue
has not appeard again, even after rapidly unpluging and pluging in the
power supply.  Attached is just the output for the add event for the
power supply.

Thanks for the fix.

** Attachment added: "udev_upstart.txt"
   
https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/829980/+attachment/2972362/+files/udev_upstart.txt

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https://bugs.launchpad.net/bugs/829980

Title:
  upstart-udev-bridge eats 100% cpu calling
  dbus_message_iter_append_basic()

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