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[Samba] Winbindd runs interactively, fails as a daemon




Hi,
I have server which is joined to an AD DC but I am having problems starting or keeping winbind running. If I reboot the server, it fails to start. If I then start it with "winbindd -i" it runs. I can then terminate it and run it as a service and it works for a while. At some indeterminate point in the future it may fail again.

When trying to start it initially (before a winbindd -i) with loglevel 3, I am seeing the following in the MYSERVER-winbindd logs: [2019/01/30 11:27:56.311372,  3] ../source3/param/loadparm.c:3847(lp_load_ex)
  lp_load_ex: refreshing parameters
[2019/01/30 11:27:56.311404,  3] ../source3/param/loadparm.c:543(init_globals)
  Initialising global parameters
[2019/01/30 11:27:56.311415,  2] ../source3/param/loadparm.c:315(max_open_files)
  rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
[2019/01/30 11:27:56.311460,  3] ../source3/param/loadparm.c:2761(lp_do_section)
  Processing section "[global]"
[2019/01/30 11:27:56.311989,  2] ../source3/lib/interface.c:345(add_interface)   added interface lo ip=::1 bcast= netmask=ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff [2019/01/30 11:27:56.312032,  2] ../source3/lib/interface.c:345(add_interface)
  added interface lo ip=127.0.0.1 bcast=127.255.255.255 netmask=255.0.0.0
[2019/01/30 11:27:56.312045,  2] ../source3/lib/interface.c:345(add_interface)   added interface eth0 ip=10.20.40.248 bcast=10.20.40.255 netmask=255.255.255.0 [2019/01/30 11:27:56.312069,  2] ../source3/lib/interface.c:345(add_interface)   added interface eth1 ip=192.168.20.1 bcast=192.168.20.255 netmask=255.255.255.0 [2019/01/30 11:27:56.312198,  2] ../source3/lib/interface.c:345(add_interface)   added interface lo ip=::1 bcast= netmask=ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff [2019/01/30 11:27:56.312210,  2] ../source3/lib/interface.c:345(add_interface)
  added interface lo ip=127.0.0.1 bcast=127.255.255.255 netmask=255.0.0.0
[2019/01/30 11:27:56.312219,  2] ../source3/lib/interface.c:345(add_interface)   added interface eth0 ip=10.20.40.248 bcast=10.20.40.255 netmask=255.255.255.0 [2019/01/30 11:27:56.312232,  2] ../source3/lib/interface.c:345(add_interface)   added interface eth1 ip=192.168.20.1 bcast=192.168.20.255 netmask=255.255.255.0 [2019/01/30 11:27:56.317034,  1] ../source3/lib/tdb_validate.c:480(tdb_validate_and_backup)
  tdb '/var/lib/samba/winbindd_cache.tdb' is valid
[2019/01/30 11:27:56.358707,  1] ../source3/lib/tdb_validate.c:490(tdb_validate_and_backup)   Created backup '/var/lib/samba/winbindd_cache.tdb.bak' of tdb '/var/lib/samba/winbindd_cache.tdb' [2019/01/30 11:27:56.359028,  2] ../source3/winbindd/winbindd_util.c:283(add_trusted_domain_from_tdc)
  Added domain BUILTIN (null) S-1-5-32
[2019/01/30 11:27:56.359050,  2] ../source3/passdb/pdb_interface.c:161(make_pdb_method_name)
  No builtin backend found, trying to load plugin
[2019/01/30 11:27:56.360125,  3] ../lib/util/modules.c:167(load_module_absolute_path)
  load_module_absolute_path: Module '/usr/lib64/samba/pdb/tdbsam.so' loaded
[2019/01/30 11:27:56.360178,  2] ../source3/winbindd/winbindd_util.c:283(add_trusted_domain_from_tdc)
  Added domain MYSERVER (null) S-1-5-21-1816223972-1230817346-2711509928
[2019/01/30 11:27:56.360216,  2] ../source3/winbindd/winbindd_util.c:283(add_trusted_domain_from_tdc)
  Added domain DC DC.NJH.LAN S-1-5-21-2586452059-1910575978-1497397321
[2019/01/30 11:27:56.360259,  2] ../source3/lib/tallocmsg.c:56(register_msg_pool_usage)
  Registered MSG_REQ_POOL_USAGE
[2019/01/30 11:27:56.360268,  2] ../source3/lib/dmallocmsg.c:78(register_dmalloc_msgs)
  Registered MSG_REQ_DMALLOC_MARK and LOG_CHANGED
[2019/01/30 11:27:56.360577,  0] ../lib/util/become_daemon.c:124(daemon_ready)   STATUS=daemon 'winbindd' finished starting up and ready to serve connections [2019/01/30 11:27:57.639808,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18144]: request interface version (version = 29)
[2019/01/30 11:27:57.639881,  3] ../source3/winbindd/winbindd_misc.c:428(winbindd_priv_pipe_dir)
  [18144]: request location of privileged pipe
[2019/01/30 11:27:57.639950,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18144]: request interface version (version = 29)
[2019/01/30 11:27:57.640006,  3] ../source3/winbindd/winbindd_misc.c:383(winbindd_info)
  [18144]: request misc info
[2019/01/30 11:27:57.640062,  3] ../source3/winbindd/winbindd_misc.c:416(winbindd_netbios_name)
  [18144]: request netbios name
[2019/01/30 11:27:57.640115,  3] ../source3/winbindd/winbindd_misc.c:405(winbindd_domain_name)
  [18144]: request domain name
[2019/01/30 11:27:57.640204,  3] ../source3/winbindd/winbindd_misc.c:237(winbindd_domain_info)
  [18144]: domain_info [DC]
[2019/01/30 11:27:59.841648,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18146]: request interface version (version = 29)
[2019/01/30 11:27:59.841767,  3] ../source3/winbindd/winbindd_misc.c:428(winbindd_priv_pipe_dir)
  [18146]: request location of privileged pipe
[2019/01/30 11:27:59.841850,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18146]: request interface version (version = 29)
[2019/01/30 11:27:59.841907,  3] ../source3/winbindd/winbindd_misc.c:383(winbindd_info)
  [18146]: request misc info
[2019/01/30 11:27:59.841962,  3] ../source3/winbindd/winbindd_misc.c:416(winbindd_netbios_name)
  [18146]: request netbios name
[2019/01/30 11:27:59.842016,  3] ../source3/winbindd/winbindd_misc.c:405(winbindd_domain_name)
  [18146]: request domain name
[2019/01/30 11:27:59.842073,  3] ../source3/winbindd/winbindd_misc.c:237(winbindd_domain_info)
  [18146]: domain_info [DC]
[2019/01/30 11:28:00.087153,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18148]: request interface version (version = 29)
[2019/01/30 11:28:00.087224,  3] ../source3/winbindd/winbindd_misc.c:428(winbindd_priv_pipe_dir)
  [18148]: request location of privileged pipe
[2019/01/30 11:28:00.087291,  3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [18148]: request interface version (version = 29)
[2019/01/30 11:28:00.087370,  3] ../source3/winbindd/winbindd_misc.c:383(winbindd_info)
  [18148]: request misc info
[2019/01/30 11:28:00.087456,  3] ../source3/winbindd/winbindd_misc.c:416(winbindd_netbios_name)
  [18148]: request netbios name
[2019/01/30 11:28:00.087514,  3] ../source3/winbindd/winbindd_misc.c:405(winbindd_domain_name)
  [18148]: request domain name
[2019/01/30 11:28:00.087575,  3] ../source3/winbindd/winbindd_misc.c:237(winbindd_domain_info)
  [18148]: domain_info [DC]
[2019/01/30 11:28:01.264413,  0] ../source3/winbindd/winbindd.c:281(winbindd_sig_term_handler)
  Got sig[15] terminate (is_parent=1)

I have tried clearing all the tdb files in /var/lib/samba (but not the sub-directories) and rejoining the domain. I do not understand why it is terminating, especially as it does not when run interactively or when it is started after it has been run interactively.

I am running v4.7.1

TIA,
Nick


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