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Description of problem:
In RHEV-H we are using a tmpfs'ed /etc, wthint this tmpfs'ed etc we are using bind.mounts to bind-mount in config files (which reside on a writable partition elsewhere).
Once udevd comes up, these files ran not be renamed anymore - even if unmounted - because udevd is keeping the bind-mounts in it's mnt namespace.

Version-Release number of selected component (if applicable):
systemd-219-19.el7

How reproducible:
Always

Steps to Reproduce:
1. See bug 1263648
2.
3.

Actual results:


Expected results:


Additional info:

PR available here:
https://github.com/systemd/systemd/pull/2050

How to reproduce:

1. tmpfs on /tmp
2. touch /tmp/shadow
3. mount --bind /etc/shadow /tmp/shadow
4. systemctl restart systemd-udevd.service
5. umount /tmp/shadow
6. mv /tmp/shadow /tmp/shadow-

6 fails with "mv: cannot move 'shadow' to 'shadow-': Device or resource busy"

*** This bug has been marked as a duplicate of bug 1432211 ***