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Description of problem:

Output of free utility for Memory used is wrong.
Now, the value is decreased by integer from /proc/meminfo -> Slab, but based on upstream version, it should be decreased only by integer from /proc/meminfo -> SReclaimable.

Version-Release number of selected component (if applicable):
procps-ng-3.3.10-23.el7

How reproducible:
$ free 

Actual results:
Mem used is computed without SUnreclaim.

Expected results:
Mem used should contain value from SUnreclaim

Additional info:
This bug is blocking #1250060 (net-snmp)

Unreclaimable slabs shouldn't be counted in available memory.
Josef, thanks for the catch!

Upstream fix:
https://gitlab.com/procps-ng/procps/commit/05d751c4f076a2f0118b914c5e51cfbb4762ad8e

Debian bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=799716

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/RHSA-2019:2189