PANIC: internal error when deleting users

Michael Wood esiotrot at
Tue Nov 9 07:48:01 MST 2010

On 9 November 2010 15:11, Gianni L <slowsin at> wrote:
> yeah! I think I finally got it :)
> here's now a more detailed backtrace of the crash..
> sorry for my inexperience with debugging tools :)
> hope the info helps a bit..

OK, so val is NULL in ldb_msg_add_value().  It comes from this line

ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name),
new_rdn_value, &el);

i.e. new_rdn_value is NULL.

new_rdn_value is set just above that:

		/* work out what the new rdn value is, for updating the
		   rDN and name fields */
		new_rdn_value = ldb_dn_get_rdn_val(new_dn);

and ldb_dn_get_rdn_val() does this:

const struct ldb_val *ldb_dn_get_rdn_val(struct ldb_dn *dn)
	if ( ! ldb_dn_validate(dn)) {
		return NULL;
	if (dn->comp_num == 0) return NULL;
	return &dn->components[0].value;

So it seems there should be a check after calling ldb_dn_get_rdn_val()
to see if it returned NULL, or else the NULL value should be handled
in ldb_msg_add_value().

> On Tue, Nov 9, 2010 at 1:17 PM, Michael Wood <esiotrot at> wrote:
>> Hi
>> On 9 November 2010 13:29, Gianni L <slowsin at> wrote:
>> > Hi Mat,
>> > sorry but I can't find any samba-segfault script, neither in the install
>> > location of samba 4 neither in the sourcecode :(
>> > tried even to search in the git sources of another computer and there's
>> > anything.
>> > if someone could provide me a copy of the script I would be happy to run
>> > another test and provide the results :)
>> I don't have a samba-segfault script either, but try running "bt full"
>> in gdb when Samba crashes.  That will provide lots more useful
>> information.
>> I've just found "examples/scripts/debugging/linux/backtrace" which
>> might be the script Matthieu is referring to.

Michael Wood <esiotrot at>

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