[Piuparts-reports] problem with piuparts-slave detected

[piuparts slave]

Either a test is running for a very long time (more than 90 minutes),
or piuparts-slave hangs or is not running at all or wasn't started with
~piupartss/bin/slave_run - please investigate and take appropriate measures!

20:54:33 Running section buster-pu (precedence=3)
20:54:35 idle (3600)
20:54:35 -------------------------------------------
20:54:35 Running section experimental (precedence=3)
20:54:35 idle (3396)
20:54:35 -------------------------------------------
20:54:35 Running section stretch2buster (precedence=4)

Slave interrupted by the user, exiting...
piupartss at piu-slave-ubc-01:/srv/piuparts.debian.org/slave/1$