[Samba] Unable to successfully join Samba 4.8.0 or Windows 2008 R2 to a Samba 4.6.7 DC

[Justin Foreman]

When I attempt to join samba 4.8.0 (stable) to my samba 4.6.7 DC (Ubuntu),
I receive the following error:

Partition[DC=us,DC=dignitastech,DC=com] objects[500/1605]
linked_values[0/118]
Failed to commit objects: WERR_GEN_FAILURE
Join failed - cleaning up
Deleted CN=DC3-CLONE,OU=Domain Controllers,DC=us,DC=dignitastech,DC=com
Deleted CN=NTDS
Settings,CN=DC3-CLONE,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=us,DC=dignitastech,DC=com
Deleted
CN=DC3-CLONE,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=us,DC=dignitastech,DC=com
ERROR(runtime): uncaught exception - (31, "Failed to process 'chunk' of DRS
replicated objects: WERR_GEN_FAILURE")
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/__init__.py",
line 176, in _run
    return self.run(*args, **kwargs)
  File
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/domain.py", line
706, in run
    plaintext_secrets=plaintext_secrets)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/join.py", line
1482, in join_DC
    ctx.do_join()
  File "/usr/local/samba/lib/python2.7/site-packages/samba/join.py", line
1383, in do_join
    ctx.join_replicate()
  File "/usr/local/samba/lib/python2.7/site-packages/samba/join.py", line
942, in join_replicate
    replica_flags=ctx.domain_replica_flags)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/drs_utils.py",
line 330, in replicate
    raise e

Possibly related, when I join a Windows 2008 R2 server, I see the following
in the event viewer during the join:
Internal error: An Active Directory Domain Services error has occurred.

Additional Data
Error value (decimal):
8374
Error value (hex):
20b6
Internal ID:
30d07c5

After a reboot, I get a blue screen with the following:
STOP: c00002cb Security Accounts Manager initialization failed because of
the following error:
The system cannot find the file specified.

I can only get into the Windows DC through DSRM at this point.

dbcheck --cross-ncs is clean.

Let me know what type of logging you need from the Samba DC and I can
reproduce this.