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Replication mode - glibc detected *** slapd: double free or corruption

I've had replication working for the last few months and now running into the following when I run:
slapd -h "ldapi:/// ldap:/// ldaps:///" -d 4
 
I installed GIT on the server, version 1.7.1 which is a couple years old, but was wondering would that have anything causing replication to stop working?
 
...
<= ldap_bv2dn(cn=Database 3,cn=Databases,cn=Monitor)=0
=> ldap_dn2bv(272)
<= ldap_dn2bv(cn=database 3,cn=databases,cn=monitor)=0
559edda4 hdb_db_open: "dc=pi-coral,dc=com"
559edda4 hdb_db_open: database "dc=pi-coral,dc=com": unclean shutdown detected; attempting recovery.
559edda4 => bdb_entry_get: ndn: "dc=pi-coral,dc=com"
559edda4 => bdb_entry_get: oc: "(null)", at: "contextCSN"
559edda4 bdb_idl_fetch_key:
559edda4 bdb_idl_fetch_key:
559edda4 send_ldap_result: err=0 matched="" text=""
559edda4 [rw] searchDN: "ou=Users,ou=example,dc=ad,dc=example,dc=com" -> "ou=Users,ou=example,dc=ad,dc=example,dc=com"
*** glibc detected *** slapd: double free or corruption (out): 0x00007f3382f44bb0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75e66)[0x7f339ab17e66]
/lib64/libc.so.6(+0x789b3)[0x7f339ab1a9b3]
slapd(filter_free_x+0x13a)[0x7f339ebd72da]
/usr/lib64/openldap/rwm-2.4.so.2(+0xb34d)[0x7f3397d0c34d]
/usr/lib64/openldap/rwm-2.4.so.2(rwm_filter_map_rewrite+0x2b)[0x7f3397d0c99b]
/usr/lib64/openldap/rwm-2.4.so.2(+0x6c3a)[0x7f3397d07c3a]
slapd(overlay_op_walk+0x4a)[0x7f339ec41efa]
slapd(+0xbaa3b)[0x7f339ec42a3b]
slapd(+0xb87ab)[0x7f339ec407ab]
slapd(overlay_op_walk+0x4a)[0x7f339ec41efa]
slapd(+0xbaa3b)[0x7f339ec42a3b]
/usr/lib64/openldap/syncprov-2.4.so.2(+0x70ae)[0x7f3397afb0ae]
/usr/lib64/openldap/syncprov-2.4.so.2(+0x72a0)[0x7f3397afb2a0]
/lib64/libpthread.so.0(+0x79d1)[0x7f339b0489d1]
/lib64/libc.so.6(clone+0x6d)[0x7f339ab8a8fd]
======= Memory map: ========
7f337c000000-7f337c021000 rw-p 00000000 00:00 0
7f337c021000-7f3380000000 ---p 00000000 00:00 0
7f3381743000-7f3382745000 rw-p 00000000 00:00 0
7f3382745000-7f3382746000 ---p 00000000 00:00 0
7f3382746000-7f3382f46000 rw-p 00000000 00:00 0
7f3382f46000-7f3382f4e000 rw-s 00000000 ca:01 795307                     /var/lib/ldap/__db.006
7f3382f4e000-7f3383006000 rw-s 00000000 ca:01 795306                     /var/lib/ldap/__db.005
7f3383006000-7f3383246000 rw-s 00000000 ca:01 794767                     /var/lib/ldap/__db.004
7f3383246000-7f3397248000 rw-s 00000000 ca:01 794749                     /var/lib/ldap/__db.003
7f3397248000-7f3397af4000 rw-s 00000000 ca:01 794744                     /var/lib/ldap/__db.002
7f3397af4000-7f3397b00000 r-xp 00000000 ca:01 538738                     /usr/lib64/openldap/syncprov-2.4.so.2.10.2
7f3397b00000-7f3397cff000 ---p 0000c000 ca:01 538738                     /usr/lib64/openldap/syncprov-2.4.so.2.10.2
7f3397cff000-7f3397d00000 r--p 0000b000 ca:01 538738                     /usr/lib64/openldap/syncprov-2.4.so.2.10.2
...
 
7f339f6ac000-7f339f9ee000 rw-p 00000000 00:00 0                          [heap]
7fff8ad37000-7fff8ad4c000 rw-p 00000000 00:00 0                          [stack]
7fff8ad84000-7fff8ad85000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted