samba36-3.6.20_1 doesn't start after port upgrade

[Alexander]

previos vershion was not so old, I think it was 3.6.19
I didn't change config file. I have not any options in make.conf
I have changed hardware recently - migrate zfs pool to new machine, but all woked fine after that including samba

# service samba start
Removing stale Samba tdb files: . done
Starting nmbd.
Starting smbd.
Abort trap (core dumped)
/usr/local/etc/rc.d/samba: WARNING: failed to start smbd

/var/log/samba/log.smbd
===============================================================
[2013/11/19 09:48:57.210539,  0] lib/util.c:1117(smb_panic)
  PANIC (pid 79891): internal error
[2013/11/19 09:48:57.210592,  0] lib/util.c:1221(log_stack_trace)
  BACKTRACE: 0 stack frames:
[2013/11/19 09:48:57.210646,  0] lib/fault.c:416(dump_core)
  dumping core in /var/log/samba/cores/smbd

/var/log/samba/log.nmbd
  ===============================================================
[2013/11/19 09:48:57,  0] lib/util.c:1117(smb_panic)
  PANIC (pid 79888): internal error
[2013/11/19 09:48:57,  0] lib/util.c:1221(log_stack_trace)
  BACKTRACE: 0 stack frames:
[2013/11/19 09:48:57,  0] lib/fault.c:416(dump_core)
  dumping core in /var/log/samba/cores/nmbd