(ITS#6030) slapd segfaults when loading already present module

[luca@OpenLDAP.org]

Full_Name: Luca Scamoni
Version: RE24/HEAD
OS: any
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (82.63.140.131)


When loading a module through cn=config or slapd.conf moduleload directive, if
the module has already been loaded, slapd segfaults. Since it correctly finds
out the module is already registered shouldn't it refuse the modification when
the operation is attempted through cn=config or simply refuse to start when done
through slapd.conf?

Last log lines (-d -1):
line 20 (moduleload     syncprov.la)
loaded module syncprov.la
Control 1.3.6.1.4.1.4203.1.9.1.1 already registered.
syncprov_init: Failed to register control -9
Segmentation fault

backtrace:
#0  0x0000000b in ?? ()
No symbol table info available.
#1  0x080dcb94 in module_load (file_name=0x89746bb "syncprov.la", argc=0,
argv=0x0)
    at module.c:218
        module = (module_loaded_t *) 0x8976718
        error = 0x0
        rc = -9
        initialize = (MODULE_INIT_FN) 0x5f6936 <init_module>
#2  0x0805bd1c in config_generic (c=0x8967970) at bconfig.c:1940
        i = 11784196
        __PRETTY_FUNCTION__ = "config_generic"
#3  0x0806a586 in config_set_vals (Conf=0x8168160, c=0x8967970) at config.c:314
        rc = 0
        arg_type = -2013265890
        ptr = (void *) 0x0
#4  0x0806aa68 in config_add_vals (Conf=0x8168160, c=0x8967970) at config.c:383
        rc = 0
        arg_type = -2013265890
#5  0x0806ba42 in read_config_file (fname=0x8932308
"/usr/local/openldap/etc/slapd.conf",
    depth=0, cf=0x0, cft=0x8167bc0) at config.c:736
        fp = (FILE *) 0x89692f8
        ct = (ConfigTable *) 0x8168160
        c = (ConfigArgs *) 0x8967970
        rc = 0
        s = {st_dev = 64768, __pad1 = 0, st_ino = 172196293, st_mode = 33152,
st_nlink = 1,
  st_uid = 0, st_gid = 0, st_rdev = 0, __pad2 = 0, st_size = 1087, st_blksize =
4096,
  st_blocks = 8, st_atim = {tv_sec = 1237802811, tv_nsec = 0}, st_mtim = {tv_sec
= 1237802556,
    tv_nsec = 0}, st_ctim = {tv_sec = 1237802556, tv_nsec = 0}, __unused4 = 0,
__unused5 = 0}
#6  0x08061626 in read_config (fname=0x8932308
"/usr/local/openldap/etc/slapd.conf", dir=0x0)
    at bconfig.c:3613
        be = (BackendDB *) 0x8967800
        cfb = (CfBackInfo *) 0x816c340
        cfdir = 0x11f0bc ""
        cfname = 0x8932308 "/usr/local/openldap/etc/slapd.conf"
        rc = 0
        __PRETTY_FUNCTION__ = "read_config"
#7  0x08057a5d in main (argc=5, argv=0xbfc1ce24) at main.c:754
        i = -1
        no_detach = 0
        rc = 0
        urls = 0x89323f0 "ldap://:9000";
        username = 0x0
        groupname = 0x0
        sandbox = 0x0
        syslogUser = 160
        g_argc = 5
        g_argv = (char **) 0xbfc1ce24
        configfile = 0x8932308 "/usr/local/openldap/etc/slapd.conf"
        configdir = 0x0
        serverName = 0xbfc1eb66 "slapd"
        serverMode = 1
        scp = (struct sync_cookie *) 0x0
        scp_entry = (struct sync_cookie *) 0x0
        debug_unknowns = (char **) 0x0
        syslog_unknowns = (char **) 0x0
        serverNamePrefix = 0x811b537 ""
        l = 1347407256
        slapd_pid_file_unlink = 0
        slapd_args_file_unlink = 0
        firstopt = 0
        __PRETTY_FUNCTION__ = "main"