[Bug 253062] dns/bind916: Hang on service stop in uwait state starting in v9.16.11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253062

            Bug ID: 253062
           Summary: dns/bind916: Hang on service stop in uwait state
                    starting in v9.16.11
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: mat at FreeBSD.org
          Reporter: john at saltant.com
             Flags: maintainer-feedback?(mat at FreeBSD.org)
          Assignee: mat at FreeBSD.org
             Flags: maintainer-feedback?

After upgrading from 9.16.10 to 9.16.11, the named service does not stop
properly.

$ sudo service named stop
Stopping named.
Waiting for PIDS: %PID% <-- hangs here indefinitely

$ procstat %PID%
  PID  PPID  PGID   SID  TSID THR LOGIN    WCHAN     EMUL          COMM
%PID%     1 %PID% %PID%     0  26 obrienjw uwait     FreeBSD ELF64 named


(lldb) bt
* thread #1, name = 'named'
  * frame #0: 0x0000000800cc768c libthr.so.3`_umtx_op_err at _umtx_op_err.S:37
    frame #1: 0x0000000800cc3591
libthr.so.3`join_common(pthread=0x0000000803585200,
thread_return=0x0000000000000000, abstime=0x0000000000000000,
peek=<unavailable>) at thr_join.c:147:9
    frame #2: 0x000000000050dbef named`isc_thread_join + 31
    frame #3: 0x00000000004fb49f named`isc_taskmgr_destroy + 607
    frame #4: 0x00000000002dae31 named`main + 5841
    frame #5: 0x00000000002d16b0 named`_start + 256

This is reproducible on two different 12.2R machines on which named is
configured to act as a resolver. The hang does not occur on two other hosts on
which named is configured to as as authoritative only. On the hosts where the
hang occurs, the named logs contain lines of the form:

Jan 28 08:03:12 hostname named[%PID%]: creating IPv6 interface igb0 failed;
interface ignored

These errors are absent on the hosts where the hang does not occur.

The 9.16.11 changelog includes a number of items related to threads and netmgr.

5557.   [bug]           Prevent RBTDB instances from being destroyed by
multiple
                        threads at the same time. [GL #2317]

5545.   [func]          OS support for load-balanced sockets is no longer
                        required to receive incoming queries in multiple netmgr
                        threads. [GL #2137]

5543.   [bug]           Fix UDP performance issues caused by making netmgr
                        callbacks asynchronous-only. [GL #2320]

5542.   [bug]           Refactor netmgr. [GL #1920] [GL #2034] [GL #2061]
                        [GL #2194] [GL #2221] [GL #2266] [GL #2283] [GL #2318]
                        [GL #2321]

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