This is fixed in Debian with the following change:
cron (3.0pl1-128) unstable; urgency=medium
* d/cron.service: Use KillMode=process to kill only the daemon.
The default of KillMode=control-group kills all the processes in the
control group, for example when restarting the daemon. This is a deviation from
past behavior we do not want. Thanks, Alexandre Detiste! Closes: #783683
** Bug watch added: Debian Bug tracker #783683
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783683
** Also affects: cron (Debian) via
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783683
Importance: Unknown
Status: Unknown
** Changed in: cron (Ubuntu)
Status: Confirmed => Triaged
** Also affects: cron (Ubuntu Xenial)
Importance: Medium
Status: Triaged
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https://bugs.launchpad.net/bugs/1527348
Title:
restarting cron kills children on 16.04 - did not kill on 14.04
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