[Bug 247620] cap_mkdb detects but does not stop reference loop errors in login.conf

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247620

            Bug ID: 247620
           Summary: cap_mkdb detects but does not stop reference loop
                    errors in login.conf
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mike at elite.uk.com

If a loop is created in /etc/login.conf, for example by including :tc=default:
in the default class, cap_mkdb will issue a warning:

"cap_mkdb: potential reference loop detected"

but still write a non-usable database.

Once this has happened authentication attempts fail with "PAM account
management error: Error in service module"

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