[systemd-bugs] [Bug 56837] Enable custom path to be ignored on shutdown umount cycle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56837

--- Comment #6 from aleksei.lissitsin at gmail.com ---
Yes. Without MNT_FORCE it now seems to behave correctly: only bind-mount gets
unmounted.

Just for the info: the problem only exists in the setting when only the
bind-mount is seen in mountinfo, and the real mountpoint is hidden. umount2
with MNT_FORCE then incorrectly assumes that the bind-mount is the last
mountpoint and proceeds to unmount the device (it succeeds because of MNT_FORCE
probably).

If both mountpoints are seen, it would correctly only detach the bind-mount and
leave the device mounted.

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