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Pach has been submitted upstream:
http://marc.info/?l=util-linux-ng&m=141184467317500&w=2

To repeat the problem:

terminal 1$  sudo su -
terminal 1$  echo $$

terminal 2$  kill -9 THE-PID-OF-THE-SU-IN-TERMINAL-1


It should only print "Killed", not "Killed (core dumped)"

The patch may be slightly customized to avoid needing an
extra internationalization for " (core dumped)", that is,
with a leading " ".

The patch just reorded the assignment of status, so it
only changes the text print.

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://rhn.redhat.com/errata/RHBA-2015-2093.html