Ok, I can reproduce this with a simple "smbclient -L localhost -N" and
this smb.conf:

        dns proxy = No
        domain master = No
        kerberos method = secrets and keytab
        local master = No
        log file = /var/log/samba/log.%m
        map to guest = Bad User
        max log size = 1000
        obey pam restrictions = Yes
        pam password change = Yes
        panic action = /usr/share/samba/panic-action %d
        passwd chat = *Enter\snew\s*\spassword:* %n\n 
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
        passwd program = /usr/bin/passwd %u
        security = USER
        server role = standalone server
        server string = %h %a
        syslog = 0
        unix password sync = Yes
        usershare allow guests = Yes
        idmap config * : backend = tdb

The moment I remove your "kerberos method" option (i.e., comment it), the crash 
no longer happens.

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  [bionic] samba PANIC, INTERNAL ERROR: Signal 11

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