[Samba] Samba CTDB clustering panic

[João Baúto]

Hi all,

I'm setting up a clustered environment on CentOS 7.6.1810 with
Samba 4.8.3-6.el7_6 and the corresponding ctdb package. I'm using FreeIPA
4.6.4 as my auth backend.

Currently I'm running into this bug
https://bugzilla.samba.org/show_bug.cgi?id=13465 however I would assume
that it is fixed in the latest release (dated 29July 2019). It crashed once
CTDB runs testparm to check the configuration. Setting clustering to no
allows access to the shares via public address.

The panic message is,

50.samba: /etc/ctdb/events.d/50.samba: line 79: 15459 Aborted
  timeout "$_timeout" testparm -v -s > "$_out" 2> "$_err"
50.samba: ERROR: smb.conf cache create failed - testparm failed with:
50.samba: Load smb config files from /etc/samba/smb.conf
50.samba: rlimit_max: increasing rlimit_max (1024) to minimum Windows limit
(16384)
50.samba: Processing section "[swp]"
50.samba: smb_panic_default: PANIC (pid 15460): messaging not initialized
50.samba: BACKTRACE: 17 stack frames:
50.samba:  #0 /lib64/libsamba-util.so.0(log_stack_trace+0x1a)
[0x7f599afd9aaa]
50.samba:  #1 /lib64/libsamba-util.so.0(smb_panic+0x52) [0x7f599afd9bb2]
50.samba:  #2 /usr/lib64/samba/libsamba-cluster-support-samba4.so(+0x77a0)
[0x7f5997dab7a0]
50.samba:  #3 /lib64/libsmbconf.so.0(db_open+0x253) [0x7f599b26db93]
50.samba:  #4 /lib64/libsmbconf.so.0(regdb_init+0x86) [0x7f599b255566]
50.samba:  #5 /lib64/libsmbconf.so.0(registry_init_common+0x6)
[0x7f599b256e46]
50.samba:  #6 /lib64/libsmbconf.so.0(registry_init_smbconf+0x26)
[0x7f599b285d76]
50.samba:  #7 /lib64/libsmbconf.so.0(+0x56c16) [0x7f599b284c16]
50.samba:  #8 /lib64/libsmbconf.so.0(smbconf_init_internal+0x49)
[0x7f599b2877a9]
50.samba:  #9 /lib64/libsmbconf.so.0(smbconf_init+0x120) [0x7f599b284000]
50.samba:  #10 /lib64/libsmbconf.so.0(+0x29146) [0x7f599b257146]
50.samba:  #11 /lib64/libsmbconf.so.0(process_registry_shares+0x2f)
[0x7f599b260dbf]
50.samba:  #12 /lib64/libsmbconf.so.0(+0x34a2a) [0x7f599b262a2a]
50.samba:  #13 /lib64/libsmbconf.so.0(lp_load_with_registry_shares+0x22)
[0x7f599b262c82]
50.samba:  #14 testparm(main+0x3a2) [0x55a45fc15b32]
50.samba:  #15 /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f599a1d0495]
50.samba:  #16 testparm(+0x3f1c) [0x55a45fc16f1c]
50.samba: timeout: the monitored command dumped core
monitor event failed

*smb.conf*
[global]
netbios name = EXAMPLE
realm = EXAMPLE.COM
workgroup = EXAMPLE
domain master = Yes
ldap group suffix = cn=groups,cn=accounts
ldap machine suffix = cn=computers,cn=accounts
ldap ssl = off
ldap suffix = dc=example,dc=com
ldap user suffix = cn=users,cn=accounts
log file = /var/log/samba/log
dedicated keytab file = FILE:/etc/samba/samba.keytab
kerberos method = dedicated keytab
passdb backend = ipasam:ldap://ipa.example.com
security = USER
idmap config * : backend = tdb
ldap admin dn = cn=Directory Manager
writable = yes
browseable = yes
read only = no
guest ok = no
clustering = yes

[test]
create mode = 0640
directory mode = 0750
path = /gluster/data
valid users = john.doe

Anyone has an idea why this is happening?

Thanks!

JB