[Bug 1794537] Re: net ads join crashes on error in DoDNSUpdate

[Francis]

Hi,

I just tried installing cosmic in a VM and I confirm I can make the
server to join the domain without crashing (according to the bug tracker
it was fixed in Samba 4.8.2 and cosmic is at 4.8.4). But I don't get any
users. Can't login with an AD user and "getent passwd <user>" returns
nothing. Maybe a new bug or something new in Samba/Winbind 4.8 I'm not
aware (my prod is still at 4.7.x).

I don't think this affect all AD joins. I think this is related to this message I get when joining:
DNS update failed: NT_STATUS_UNSUCCESSFUL

The dns record <hostname>.ad.<domain>.<tld> is indeed not created after
the successful join. Seem like this is a common issue but doesn't block
the joining process (see
https://wiki.samba.org/index.php/Troubleshooting_Samba_Domain_Members#DNS_Update_failed:_ERROR_DNS_UPDATE_FAILED).
I didn't found a way to resolve this yet. But I think this is off topic.

I don't have problems to make AD joins with sssd or with Windows
clients. Windows clients have no problem with dns updates. My linux
server joined with sssd have their dns record, but they don't change ip,
so I can't say for sure the dns update is still working for them. All AD
DC are Samba 4.7.10 (there is no Windows server at all).

Yesterday, I rebuilt the samba packages to apply the patch and then I
installed my custom build. I confirm this solved the problem I had.
After joining the domain, I reverted to the official build and my samba
was still joined to the domain and still working fine.

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https://bugs.launchpad.net/bugs/1794537

Title:
  net ads join crashes on error in DoDNSUpdate

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Triaged

Bug description:
  Hi,

  Could you backport this bug fix in bionic please? There is a patch
  from upstream in the samba's bugzilla:
  https://bugzilla.samba.org/show_bug.cgi?id=13440.

  Because of this bug, I'm unable to make my bionic server to join our
  AD domain.

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