Ok, so to summarize:
- sssd is providing user and groups from AD (via /etc/nsswitch.conf)
- realmd was used to join the machine to AD for the above
- local user authentication is done via pam_sss and using kerberos. Shell users
get a ticket upon login
- samba is not using winbind
I have a feeling samba is missing it's account with the AD server. I
don't know if the sssd join works for samba's "security = ADS", I have
never tested that. I always used net ads join. Is this how you
configured the non-18.04 samba member servers? With just sssd, no "net
The crash also seems to indicate that the "secrets" bit of "secrets and
keytab" is returning a null pointer to the code, so maybe samba isn't
finding the secret.
Do you have a populated /etc/krb5.keytab?
Can you try these commands:
net ads testjoin -k
net ads status -k
After having acquired a kerberos ticket most likely (for -k to work).
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[bionic] samba PANIC, INTERNAL ERROR: Signal 11
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