Comment 19 for bug 1620553

Started from Pat's script and found an easier way to reproduce it (note the final ampersand, which is the trick):

cat ./bombard.sh
#!/bin/bash
i=$1
while [ $i -gt 0 ]; do
    dbus-send --session --print-reply --type=method_call --dest='com.canonical.usensord' /com/canonical/usensord/haptic com.canonical.usensord.haptic.Vibrate uint32:100 &
    ((i--))
done

On my MX4 Arale "./bombard.sh 4" is enough to get usensord stuck