[Samba] Classicupgrade of 4.1.17 error: "list index out of range"

[MI]

I retried after deleting all machines, groups and people from LDAP, to see if the 
problem was hidden in there. But apparently not, and I still get the same error.

After adding --debuglevel=10, I see lots of debug messages during the LDAP search, 
but nothing more after that:

    # samba-tool domain classicupgrade --debuglevel=10
    --dbdir=/usr/local/samba.PDC/dbdir/ --use-xattrs=yes --realm=ad.mydomain.tld
    --dns-backend=SAMBA_INTERNAL --option="interfaces=lo eth2" --option="bind
    interfaces only=yes" /etc/samba/smb.conf.PDC
    ...
    smbldap_search_paged: search was successful
    Next rid = 1000
    ERROR(<type 'exceptions.IndexError'>): uncaught exception - list index out of range
       File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in
    _run
         return self.run(*args, **kwargs)
       File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 1321, in run
         useeadb=eadb, dns_backend=dns_backend, use_ntvfs=use_ntvfs)
       File "/usr/lib/python2.7/dist-packages/samba/upgrade.py", line 796, in
    upgrade_from_samba3
         urls = samba3.lp.get("passdb backend").split(":",1)[1].strip('"')
    The connection to the LDAP server was closed




-------- Original Message --------
> I'm trying to upgrade to AD from a Samba 4 PDC with openLDAP (on Debian 8).
>
> I'm stuck at this very unhelpful error:
>
>    # samba-tool domain classicupgrade --dbdir=/usr/local/samba.PDC/dbdir/
>    --use-xattrs=yes --realm=ad.mydomain.tld --dns-backend=SAMBA_INTERNAL
>    --option="interfaces=lo eth2" --option="bind interfaces only=yes"
>    /etc/samba/smb.conf.PDC
>    Reading smb.conf
>    Provisioning
>    Exporting account policy
>    Exporting groups
>    Exporting users
>       Skipping wellknown rid=501 (for username=nobody)
>    Next rid = 3307
>    ERROR(<type 'exceptions.IndexError'>): uncaught exception - list index out of range
>       File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in
>    _run
>         return self.run(*args, **kwargs)
>       File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 1321, in 
> run
>         useeadb=eadb, dns_backend=dns_backend, use_ntvfs=use_ntvfs)
>       File "/usr/lib/python2.7/dist-packages/samba/upgrade.py", line 796, in
>    upgrade_from_samba3
>         urls = samba3.lp.get("passdb backend").split(":",1)[1].strip('"')
>
>
> Any ideas on how to fix it or at least find some better clue?
>
>    # samba --version
>    Version 4.1.17-Debian
>
>    # lsb_release -d
>    Description:    Debian GNU/Linux 8.3 (jessie)
>
>
>
> Thanks.
>