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Description of problem:
To avoid problems like bug 1901449 in the future, we need to handle unknown capabilities.

How reproducible:
Rarely. Any time kernel adds a new capability, before systemd is rebuilt with new kernel headers.

fix merged to github master branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/151

fix merged to github rhel-8.3.0 branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/215

fix merged to github rhel-8.2.0 branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/214

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