Comment 23 for bug 1112907

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Martin Pitt (pitti) wrote : Re: upowerd crashed with signal 5 in dbus_g_connection_register_g_object()

The error message makes this quite clear:

  "A handler is already registered for /org/freedesktop/UPower/devices/battery_hid_00o12oa1o68oa3o1b_battery"

So this seems to happen if you have a wireless mouse or keyboard, which powers down due to inactivity, and then gets repowered and it tries to register the same battery again.