[Bug 219821] mail/dovecot2: occasional auth process crashing as of 2.2.30.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219821

            Bug ID: 219821
           Summary: mail/dovecot2: occasional auth process crashing as of
                    2.2.30.1
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: crash, regression
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: adamw at FreeBSD.org
          Reporter: vlad-fbsd at acheronmedia.com
          Assignee: adamw at FreeBSD.org
             Flags: maintainer-feedback?(adamw at FreeBSD.org)

Since the upgrade to 2.2.30.1, I see occasional auth process crashes:

> Jun 06 11:11:27 auth: Panic: file auth-request-handler.c: line 849 (auth_request_handler_flush_failures): assertion failed: (auth_request->state == AUTH_REQUEST_STATE_FINISHED)
> Jun 06 11:11:27 auth: Fatal: master: service(auth): child 76992 killed with signal 6 (core not dumped - set service auth { drop_priv_before_exec=yes })
> Jun 06 11:11:27 imap-login: Info: Disconnected (auth process communication failure): user=<>, method=PLAIN, rip=<CENSORED>, lip=10.0.0.8, TLS, session=<A4jJAEdRlCJbw2cs>

With the kernel logging SIGABRT:

> Jun  6 11:11:27 xoth kernel: pid 76992 (auth), uid 143: exited on signal 6

Also:

> Jun 06 14:07:43 auth: Fatal: master: service(auth): child 84326 killed with signal 11 (core not dumped - set service auth { drop_priv_before_exec=yes })
> Jun 06 14:36:42 auth: Fatal: master: service(auth): child 9104 killed with signal 11 (core not dumped - set service auth { drop_priv_before_exec=yes })

With the kernel logging SIGSEGV on both.

Talking to people in #dovecot on Freenode, it appears to be known issue, and
there are similar reports upstream in thread like this:

https://www.dovecot.org/pipermail/dovecot/2017-June/108266.html

So this PR is just a heads-up to the maintainer and a log that it has been
noticed happening on FreeBSD too.

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