https://bugs.openldap.org/show_bug.cgi?id=9337
--- Comment #1 from Quanah Gibson-Mount quanah@openldap.org --- (In reply to Frédéric Poisson from comment #0)
Does the release 2.5.51 or 2.5.52 could solve this issue ?
The change log for every release is published on the website:
https://www.openldap.org/software/release/changes.html
Neither 2.4.51 or 2.4.52 had changes related to lastbind.
I would suggest obtaining a full gdb backtrace (thr apply all bt full) from the slapd process when the crash occurs and adding it as an attachment or a comment to the bug.