```
$ bash -c 'sleep 1 && : < /dev/tty & read var' < /dev/tty
bash: line 0: read: read error: 0: Resource temporarily unavailable
```

seems to be related and is possibly the same bug. See
https://unix.stackexchange.com/questions/499422/bash-how-can-i-run-
sudo-n-true-in-the-background-without-interfering-
with-r/499433?noredirect=1#comment919635_499433

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https://bugs.launchpad.net/bugs/1815021

Title:
  Can't read and write simultaneously from serial port

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