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

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https://bugs.launchpad.net/bugs/1620553

Title:
  OSK becomes unusable as taps are delayed by 1-2 seconds and vibration
  doesn't occur any more (although gestures continue to work)

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