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(ITS#5698) slapd crashes after trying to add an invalid database entry

Full_Name: Ralf Haferkamp
Version: HEAD, RE24
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

slapd segfaults after trying to add an invalid database entry to cn=config. E.g.
I used this one to reproduce the problem (substring index is not allowed for

dn: olcdatabase=hdb,cn=config
objectclass: olchdbconfig
olcdatabase: hdb
olcsuffix: cn=test
olcdbdirectory: /tmp
olcdbcheckpoint: 3 5
olcdbindex: objectclass sub

It crashes in the checkpoint runqueue task, which it seems has not be removed
after the failed ADD operation:

#0  0x000000000052303e in hdb_checkpoint (ctx=0x41f81dd0, arg=0xb1bfb0) at
#1  0x00007f3cbcdd502f in ldap_int_thread_pool_wrapper (xpool=0x8ec640) at
#2  0x00007f3cb9d73040 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f3cb9ae60cd in clone () from /lib64/libc.so.6

A fix is on the way to HEAD.