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Description of problem:
If I want to set NICE for a unit via LimitNICE= in unit file, it does not set it properly for negative numbers.

Version-Release number of selected component (if applicable):
systemd-219-30.el7.centos.20161209.1.x86_64 (from copr)

How reproducible:
always

Steps to Reproduce:
1. Set LimitNICE=-2 in unit file and run 'nice' in process
2. or run /CoreOS/systemd/Regression/LimitSTACK-option

Actual results:
LimitNICE=0 (ulimit -e returns 18446744073709551614 which could be bug in ulimit)

Expected results:
LimitNICE=-2

https://github.com/systemd/systemd/commit/29857001854a02c292f1f3b324e7a66831e859c8 seems to be relevant

https://github.com/lnykryn/systemd-rhel/pull/73

fix merged to upstream staging branch ->
https://github.com/lnykryn/systemd-rhel/commit/c56c1f6c2b683d6f20a7e8caeecec6c3cb76798f
-> post

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-2017:2297