Hi!
Configuring delta-syncrepl, I tried olcSpSessionlogSource instead of olcSPSessionlog. After slapd war started, it dumped core like this:
… Apr 24 11:25:41 v05 slapd[5030]: syncprov_db_open: starting syncprov for suffix cn=config Apr 24 11:25:41 v05 slapd[5030]: conn=-1 op=0 syncprov_findcsn: mode=FIND_MAXCSN csn= Apr 24 11:25:41 v05 slapd[5030]: syncprov_db_open: starting syncprov for suffix dc=sap,dc=klinik,dc=uni-regensburg,dc=de Apr 24 11:25:41 v05 slapd[5030]: slapd starting Apr 24 11:25:41 v05 start[5017]: Starting ldap-server Apr 24 11:25:41 v05 systemd[1]: Started OpenLDAP Server Daemon. Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1000 op=1 generated new csn=20250424092541.888430Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a01217d0 20250424092541.888430Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a01217d0 20250424092541.888430Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5035]: DIGEST-MD5 common mech free Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1001 op=1 generated new csn=20250424092541.896113Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a0122df0 20250424092541.896113Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: conn=1001 op=1 syncprov_checkpoint: running checkpoint Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a0122df0 20250424092541.896113Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5037]: DIGEST-MD5 common mech free Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1002 op=1 generated new csn=20250424092541.900818Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a0128240 20250424092541.900818Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a012b820 20250424092541.900818Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a012b820 20250424092541.900818Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a0128240 20250424092541.900818Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5039]: DIGEST-MD5 common mech free Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1003 op=1 generated new csn=20250424092541.920778Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd19c106d00 20250424092541.920778Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd19c107760 20250424092541.920778Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd19c107760 20250424092541.920778Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd19c106d00 20250424092541.920778Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5041]: DIGEST-MD5 common mech free Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1004 op=1 generated new csn=20250424092541.937140Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd19c10c9f0 20250424092541.937140Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd19c11c110 20250424092541.937140Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd19c11c110 20250424092541.937140Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd19c10c9f0 20250424092541.937140Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5043]: DIGEST-MD5 common mech free Apr 24 11:25:41 v05 slapd[5030]: slap_get_csn: conn=1005 op=1 generated new csn=20250424092541.989098Z#000000#005#000000 manage=1 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a012b920 20250424092541.989098Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a0107320 20250424092541.989098Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a0107320 20250424092541.989098Z#000000#005#000000 Apr 24 11:25:41 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a012b920 20250424092541.989098Z#000000#005#000000 Apr 24 11:25:41 v05 ldapmodify[5044]: DIGEST-MD5 common mech free Apr 24 11:25:42 v05 slapd[5030]: slap_get_csn: conn=1006 op=1 generated new csn=20250424092542.004124Z#000000#005#000000 manage=1 Apr 24 11:25:42 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a01277f0 20250424092542.004124Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: index objectClass 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index entryCSN 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index reqEnd 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index reqResult 0x0004 Apr 24 11:25:42 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a02376f0 20250424092542.004124Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a02376f0 20250424092542.004124Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a01277f0 20250424092542.004124Z#000000#005#000000 Apr 24 11:25:42 v05 ldapmodify[5046]: DIGEST-MD5 common mech free Apr 24 11:25:42 v05 slapd[5030]: slap_get_csn: conn=1007 op=1 generated new csn=20250424092542.020297Z#000000#005#000000 manage=1 Apr 24 11:25:42 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a010a230 20250424092542.020297Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: index objectClass 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index entryCSN 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index reqEnd 0x0004 Apr 24 11:25:42 v05 slapd[5030]: index reqResult 0x0004 Apr 24 11:25:42 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a0117770 20250424092542.020297Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a0117770 20250424092542.020297Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: slap_graduate_commit_csn: removing 0x7fd1a010a230 20250424092542.020297Z#000000#005#000000 Apr 24 11:25:42 v05 ldapmodify[5048]: DIGEST-MD5 common mech free Apr 24 11:25:42 v05 slapd[5030]: slap_get_csn: conn=1008 op=1 generated new csn=20250424092542.036954Z#000000#005#000000 manage=1 Apr 24 11:25:42 v05 slapd[5030]: slap_queue_csn: queueing 0x7fd1a0237570 20250424092542.036954Z#000000#005#000000 Apr 24 11:25:42 v05 slapd[5030]: syncprov_db_open: starting syncprov for suffix cn=changelog-0 Apr 24 11:25:42 v05 slapd[5030]: [71B blob data] Apr 24 11:25:42 v05 slapd[5030]: olcSpSessionlogSource: value #0: <olcSpSessionlogSource> failed startup (cn=changelog-0)! Apr 24 11:25:42 v05 systemd[1]: Started Process Core Dump (PID 5051/UID 0). Apr 24 11:25:42 v05 systemd-coredump[5052]: [🡕] Process 5030 (slapd) of user 1000 dumped core.
Stack trace of thread 5034: #0 0x00007fd1b82a8dfc __pthread_kill_implementation (libc.so.6 + 0xa8dfc) #1 0x00007fd1b8257842 raise (libc.so.6 + 0x57842) #2 0x00007fd1b823f5cf abort (libc.so.6 + 0x3f5cf) #3 0x00007fd1b8240497 __libc_message.cold (libc.so.6 + 0x40497) #4 0x00007fd1b82b34b7 malloc_printerr (libc.so.6 + 0xb34b7) #5 0x00007fd1b82b5a69 _int_free (libc.so.6 + 0xb5a69) #6 0x00007fd1b82b81df free (libc.so.6 + 0xb81df) #7 0x00007fd1b8159bee n/a (syncprov.so + 0x3bee) #8 0x000056122f1a02ee overlay_destroy_one (slapd + 0xb82ee) #9 0x000056122f1156bd n/a (slapd + 0x2d6bd) #10 0x000056122f115fb0 n/a (slapd + 0x2dfb0) #11 0x000056122f19f533 overlay_op_walk (slapd + 0xb7533) #12 0x000056122f19f6be n/a (slapd + 0xb76be) #13 0x000056122f1319ad fe_op_add (slapd + 0x499ad) #14 0x000056122f1328d9 do_add (slapd + 0x4a8d9) #15 0x000056122f12b18f n/a (slapd + 0x4318f) #16 0x000056122f12b98d n/a (slapd + 0x4398d) #17 0x00007fd1b86bcda0 n/a (libldap-2.5.releng.so.0 + 0x48da0) #18 0x00007fd1b82a6f6c start_thread (libc.so.6 + 0xa6f6c) #19 0x00007fd1b832e338 __clone3 (libc.so.6 + 0x12e338)
Stack trace of thread 5030: #0 0x00007fd1b82a3c1e __futex_abstimed_wait_common (libc.so.6 + 0xa3c1e) #1 0x00007fd1b82a8b83 __pthread_clockjoin_ex (libc.so.6 + 0xa8b83) #2 0x000056122f1281ca slapd_daemon (slapd + 0x401ca) #3 0x000056122f10b88e main (slapd + 0x2388e) #4 0x00007fd1b8240e6c __libc_start_call_main (libc.so.6 + 0x40e6c) #5 0x00007fd1b8240f35 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x40f35) #6 0x000056122f10b90a _start (slapd + 0x2390a)
Stack trace of thread 5038: #0 0x00007fd1b82a3c1e __futex_abstimed_wait_common (libc.so.6 + 0xa3c1e) #1 0x00007fd1b82a6548 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0xa6548) #2 0x00007fd1b86bce40 n/a (libldap-2.5.releng.so.0 + 0x48e40) #3 0x00007fd1b82a6f6c start_thread (libc.so.6 + 0xa6f6c) #4 0x00007fd1b832e338 __clone3 (libc.so.6 + 0x12e338)
Stack trace of thread 5032: #0 0x00007fd1b832e796 epoll_wait (libc.so.6 + 0x12e796) #1 0x000056122f12507b n/a (slapd + 0x3d07b) #2 0x00007fd1b82a6f6c start_thread (libc.so.6 + 0xa6f6c) #3 0x00007fd1b832e338 __clone3 (libc.so.6 + 0x12e338) ELF object binary architecture: AMD x86-64 Apr 24 11:25:42 v05 ldapmodify[5050]: DIGEST-MD5 common mech free Apr 24 11:25:42 v05 systemd[1]: slapd.service: Main process exited, code=dumped, status=6/ABRT Apr 24 11:25:42 v05 systemd[1]: slapd.service: Failed with result 'core-dump'. Apr 24 11:25:42 v05 systemd[1]: systemd-coredump@1-5051-0.service: Deactivated successfully.
Looks a bit like a bad free() to me.
I was adding the syncprov overlay with the accesslog DB being defined, but the accesslog overlay to set “olcAccessLogDB: cn=changelog-0” wasn’t done yet. The changelog-0 database may have contained outdated entries.
Kind regards, Ulrich Windl