AFAICS the problem is libmount/src/context_mount.c:exec_helper() which
is uses operands in a wrong/not posixly incorrect way. See also
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
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Bugs, which is
mount from util-linux 2.27.1 (libmount 2.27.0: selinux, assert, debug)
Description:Ubuntu 16.04.2 LTS
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1692109
Title:
mount is broken/misbehaving
