Hiya,

see also https://bugs.launchpad.net/bugs/382677

Whole text included here:

When using the SQL backend, a search like:

ldapsearch ... '(cn=)'

causes slapd to crash with this error:

slapd: /tmp/openldap-2.4.15/servers/slapd/back-sql/search.c:1366: backsql_process_filter_attr: Assertion `0' failed.

Looking at the code there, it does a

switch(f->f_choice) { .... default: assert(0); }

As it happens, in that instance f_choice is something like 0x80a3, that is SLAPD_FILTER_UNDEFINED|LDAP_FILTER_EQUALITY.

And the back-sql backend doesn't support that SLAPD_FILTER_UNDEFINED flag like the other backends, hence the abort() on that assert.

A work around for that (change in indentation not shown):

--- search.c~ 2009-06-01 15:55:16.000000000 +0100 +++ servers/slapd/back-sql/search.c 2009-06-01 17:00:51.000000000 +0100 @@ -717,6 +717,9 @@ goto done; }

+ if (f->f_choice & SLAPD_FILTER_UNDEFINED) { + rc = -1; + } else { switch( f->f_choice ) { case LDAP_FILTER_OR: rc = backsql_process_filter_list( bsi, f->f_or, @@ -772,6 +775,7 @@ ad = f->f_av_desc; break; } + }

if ( rc == -1 ) { goto done;

That's only a work around. The fix would be to implement the support for such searches.

Best regards, Stephane