SELinux policy developers need to see the AVC which appear on RHEL-6. It won't be the same AVC as on RHEL-7, because unconfined_service_t is not defined in RHEL-6.

This is the avc generated in rhel6.8 machines:

type=AVC msg=audit(1481780470.788:890289): avc:  denied  { signal } for  pid=22888 comm="python" scontext=unconfined_u:system_r:glusterd_t:s0 tcontext=unconfined_u:system_r:initrc_t:s0 tclass=process
type=SYSCALL msg=audit(1481780470.788:890289): arch=c000003e syscall=62 success=no exit=-13 a0=6a59 a1=c a2=1 a3=7ffc1e6768f8 items=0 ppid=25347 pid=22888 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=42645 comm="python" exe="/usr/bin/python" subj=unconfined_u:system_r:glusterd_t:s0 key=(null)

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-2017-0627.html