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Description of problem:
only JSON-based variables can be use with set and unset. Unfortunately, this restriction is not checked. If an invalid variable is given (e.g. $invalid), this is not detected upon config processing on startup. During execution phase, this can lead to a segfault, a memory leak or other types of problems.

Version-Release number of selected component (if applicable):
rsyslog-8.24.0-5.el7_3

added corresponding tracker and upstream issue

Well it should not be that hard, you can just set/unset some invalid/undefined variable and then check for the "invalid variable in (un)set statement" error from parsing the config file.

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, 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-2017:2306