[systemd-bugs] [Bug 70856] PrivateTmp works incorrectly with `mount --make-rprivate /`

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70856

--- Comment #7 from Stanislav <s.seletskiy at gmail.com> ---
However, `mount --make-rprivate /` is needed to get LXC containers to work.

I mean that if service is not using `PrivateTmp` option, then any unmounts are
propagated to the processes running inside service. Even if `mount
--make-rprivate /` was issued before.

So, problem arises ONLY if PrivateTmp and make-rprivate using together.

Please, take a careful look on scenario I attached at first comment.

Unmounts are propagated:
# mount --make-rprivate /
# mount blahblah /mnt
# systemctl start ntpd (without PrivateTmp option in ntpd.service)
# umount /mnt

Unmounts are NOT propagated and unmounting /mnt CAUSES A PROBLEM:
# mount --make-rprivate /
# mount blahblah /mnt
# systemctl start ntpd (WITH PrivateTmp option in ntpd.service, which is
default)
# umount /mnt

Hope it is clear enough...

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