I can confirm that in nspawn as well, and a more reliable reproducer is to add a bogus device into fstab:
/dev/bogus /mnt ext4 nofail 0 0 ** Changed in: systemd (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1621846 Title: Type=idle does not actually wait for all running jobs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1621846/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs