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This bug has been copied from bug #1278584 and has been proposed
to be backported to 7.2 z-stream (EUS).

Build tested:
389-ds-base-1.3.4.0-21.el7_2.x86_64

# tail -n1 /etc/profile
export MAX_THREADS=100

nsslapd-threadnumber: 30
nsslapd-enable-nunc-stans: off

# ps huH p $(pidof ns-slapd) | wc -l
41

nsslapd-enable-nunc-stans: on
# ps huH p $(pidof ns-slapd) | wc -l
72


On the older version (389-ds-base-1.3.4.0-19.el7.x86_64):

nsslapd-enable-nunc-stans: off
# ps huH p $(pidof ns-slapd) | wc -l
41

nsslapd-enable-nunc-stans: on
# ps huH p $(pidof ns-slapd) | wc -l
142

Looks like nunc-stans created additional thread pool (30 + 100 + 12 service threads). And on a new version it's 30 + 30 + 12. So the original issue is fixed, so I mark this bug as VERIFIED. For the mentioned issue new bug will be opened.

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-2015-2572.html