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Description of problem:

During system shutdown , systemd turns the network off before unmounting all ceph mounts which causes the system to go in hung state.

Following errors are displayed on the console :

~~~~~
Apr 14 12:14:11 localhost.localdomain kernel: libceph: mon2 <IP>:<Port> connect error
Apr 14 12:14:11 localhost.localdomain kernel: libceph: connect <IP>:<Port> error -101
Apr 14 12:14:11 localhost.localdomain kernel: libceph: mon2 <IP>:<Port> connect error
Apr 14 12:14:11 localhost.localdomain kernel: libceph: connect <IP>:<Port> error -101
Apr 14 12:14:11 localhost.localdomain kernel: libceph: mon1 <IP>:<Port> connect error
Apr 14 12:14:11 localhost.localdomain kernel: libceph: connect <IP>:<Port> error -101
~~~~~

To restore the stuck system, hard reset via IPMI is required.

Version-Release number of selected component (if applicable):

systemd-239-41.el8_3.1.x86_64

Additional info:

This issue has been addressed in the the following upstream commit

https://github.com/systemd/systemd/commit/c4742de6d801b125abf3c4d1c710280f51d7c701

Backport of this commit is needed in systemd shipped with RHEL 8.

fix merged to github master branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/169

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4469