Description of problem:

Program terminated with signal 11, Segmentation fault.
#0 test_filter (op=op@entry=0x2ba29d35cf30, e=0x2ba30431f558, f=0x0) at filterentry.c:69
69 if ( f->f_choice & SLAPD_FILTER_UNDEFINED ) {
...
(gdb) l
64 Filter *f )
65 {
66 int rc;
67 Debug( LDAP_DEBUG_FILTER, "=> test_filter\n", 0, 0, 0 );
68
69 if ( f->f_choice & SLAPD_FILTER_UNDEFINED )

{ 70 Debug( LDAP_DEBUG_FILTER, " UNDEFINED\n", 0, 0, 0 ); 71 rc = SLAPD_COMPARE_UNDEFINED; 72 goto out; 73 }

(gdb) bt
#0 test_filter (op=op@entry=0x2ba29d35cf30, e=0x2ba30431f558, f=0x0) at filterentry.c:69
#1 0x00002ba034e86598 in syncprov_matchops (op=op@entry=0x2ba29d35e510, opc=opc@entry=0x2ba2a8000998,
saveit=saveit@entry=0) at syncprov.c:1334
#2 0x00002ba034e880cb in syncprov_op_response (op=0x2ba29d35e510, rs=<optimized out>) at syncprov.c:1972
#3 0x000055651ffff423 in slap_response_play (op=op@entry=0x2ba29d35e510, rs=rs@entry=0x2ba29d35dd70)
at result.c:508
#4 0x000055651ffff9e0 in send_ldap_response (op=op@entry=0x2ba29d35e510, rs=rs@entry=0x2ba29d35dd70)
at result.c:583
#5 0x0000556520000572 in slap_send_ldap_result (op=0x2ba29d35e510, rs=0x2ba29d35dd70) at result.c:861
...

this signature seems to match an old bug report at
https://bugs.openldap.org/show_bug.cgi?id=8013

which was 
fixed in master
fixed in RE25
fixed in RE24

and this fix appears to be in openldap-servers-2.4.44-25.el7_9 :

./openldap-2.4.44/CHANGES:      Fixed slapo-syncprov synprov_matchops usage of test_filter (ITS#8013)

so there may be something else or the fix was not complete.

I do not know how to reproduce this event.

Version-Release number of selected component (if applicable):

RHEL-7.9
redhat-release-server-7.9-6.el7_9.x86_64
openldap-servers-2.4.44-25.el7_9.x86_64

How reproducible:
N/A
in the report: slapd is crashing multiple times per week

Steps to Reproduce:
1. N/A
2.
3.

Actual results:

Expected results:

Additional info: