[Bug 230187] Hardware clock freezes until ntpd is killed on 11.2-RELEASE-p0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230187

--- Comment #1 from Dan McGrath <danmcgrath.ca at gmail.com> ---
Seen some more dmesg entries and had ntpq -p command time out trying to talk to
the ntpd:

+[702905] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already
in queue awaiting acceptance (10 occurrences)
+[702906] Limiting open port RST response from 4646 to 200 packets/sec
+[702966] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already
in queue awaiting acceptance (4885 occurrences)
+[703027] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already
in queue awaiting acceptance (71 occurrences)
+[703087] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already
in queue awaiting acceptance (68 occurrences)
+[703131] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 131272, size:
12288

It's probably also worth noting that I am using PF on this host, and there
seems to be a pattern of a port scan followed by a timeout. The current pf.conf
isn't configured to allow any ntp packets in unless they are in the state
table, if that helps anyone test things.

I will see about running some tests later. I have pflogd enabled with a much
longer retention period now, so hopefully I can get some captures on this.

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