Hi!

Updates:


  1.  Even when I add the missing "olcOverlay: {0}syncprov" it does not change 
a thing
  2.  When using slapmodify instead of ldapmodify to do the change offline, it 
succeeds and slapd starts after that
  3.  Adding a syncprov overlay to another database online also worked.

Kind regards,
Ulrich Windl

From: Windl, Ulrich <u.wi...@ukr.de>
Sent: Thursday, April 3, 2025 10:52 AM
To: openldap-technical@openldap.org
Subject: [EXT] Adding syncprov overlay to cn=config seems to freeze the server

Hi!

I'm trying to script a reconfiguration of out OpenLDAP servers, also changing 
the replication details.
After dropping the old syncrepl overlay, I tried to add a new one like this:
dn: olcOverlay={0}syncprov,olcDatabase={0}config,cn=config
changetype: add
objectClass: olcOverlayConfig
objectClass: olcSyncProvConfig

I deliberately did not add more specific attributes, because I wanted to add 
them later.
However I forgot to set olcOverlay.

The point is that both, ldapmodify and slapd become unresponsive using that 
LDIF, at least when provided as
ldapmodify -Y EXTERNAL -H ldapi:/// <<LDIF
...
LDIF

Is this a bug?

Seen in OpenLDAP 2.5 provided by SLES15 SP6.
>From a coredump I forced, I see that the threads are all waiting, using one of 
>these:
__pthread_clockjoin_ex
pthread_cond_wait
__pthread_clockjoin_ex

Kind regards,
Ulrich Windl

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