if winbindd is started with the -B option, the "first" daemon tries to open the idmap.tdb twice 
and fails. the second daemon leaves as a zombie. 
 
dual mode works fine though in HEAD (there the corresponding sam/idmap.c:idmap_init opens 
the idmap.tdb just once) 
 
from 3_0 CVS log.winbindd: 
 
[2003/05/03 00:56:54, 3, pid=15673] nsswitch/winbindd_idmap.c:winbindd_idmap_init(64) 
  winbindd_idmap_init: using 'tdb' as backend 
[2003/05/03 00:56:54, 3, pid=15673] nsswitch/winbindd_idmap.c:winbindd_idmap_init(78) 
  winbind_idmap_init: returning true 
[2003/05/03 00:56:54, 2, pid=15673] lib/interface.c:add_interface(79) 
  added interface ip=127.0.0.1 bcast=127.255.255.255 nmask=255.0.0.0 
[2003/05/03 00:56:54, 2, pid=15673] lib/interface.c:add_interface(79) 
  added interface ip=192.168.44.1 bcast=192.168.44.255 nmask=255.255.255.0 
[2003/05/03 00:56:54, 5, pid=15673] libsmb/namecache.c:namecache_enable(58) 
  namecache_enable: enabling netbios namecache, timeout 660 seconds 
[2003/05/03 00:56:54, 3, pid=15673] nsswitch/winbindd_idmap.c:winbindd_idmap_init(64) 
  winbindd_idmap_init: using 'tdb' as backend 
[2003/05/03 00:56:54, 2, pid=15673] tdb/tdbutil.c:tdb_log(724) 
  tdb(unnamed): tdb_open_ex: /var/lib/samba/idmap.tdb (770,0) is already open in this process 
[2003/05/03 00:56:54, 0, pid=15673] nsswitch/winbindd_idmap_tdb.c:tdb_idmap_init(307) 
  winbindd_idmap_init: Unable to open idmap database 
[2003/05/03 00:56:54, 3, pid=15673] nsswitch/winbindd_idmap.c:winbindd_idmap_init(78) 
  winbind_idmap_init: returning false