Public bug reported:

I'm not sure if it's bug in upstart or libdbus, but (2) points to
upstart, I see only two issues:

1. 100% CPU usage of the daemon

2. `upstart-udev-bridge --daemon` running as pid 472 floods /dev/null
with following messages according to strace:

...
write(2, "process 472: ", 13)           = 13
write(2, "arguments to dbus_message_iter_append_basic() were incorrect, 
assertion \"_dbus_check_is_valid_utf8 (*string_p)\" failed in file 
../../dbus/dbus-message.c line 2534.\nThis is normally a bug in some 
application using the D-Bus library.\n", 232) = 232
...

and strace shows nothing else.

gdb backtrace samples are useless due to lack of debug symbols and I see
no upstart-dbg package to get them.

** Affects: upstart (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/942453

Title:
  100% CPU usage - upstart-udev-bridge

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