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Re[2]: NTP with only GPS/PPS flags PPS as falseticker

From: Nick Burkitt
Subject: Re[2]: NTP with only GPS/PPS flags PPS as falseticker
Date: Thu, 19 Mar 2020 17:50:29 +0000
User-agent: eM_Client/7.2.37929.0
Hi Gary.

Nothing about ntp settings is write only, and they can be queried.
Best to ask about capabilities before assuming they do not exist.
Great - what's the procedure for interrogating the value of minsane?
Since there has been only one method suggested for determining its value - changing it and observing the result - I had assumed no more efficient method was available. Happy to know I was wrong.

But, of course, easier to see the problems in your ntpd.log.
Which is why I sent it to the list. The hope is that someone will examine it and be able to answer the question of why ntpd marks my GPS as a falseticker when there's no network connectivity. 

Here it is again for convenience:
Here's a few hours of ntpd.log. Note that the first log entry is from ntpd exiting in reponse to "systemctl restart ntpd".
The "wc -l" line is to explain the use of "grep -v DNS:". Remember, this is with no network connectivity.
Times are UTC.

root@MPM-4006:~# tail -40000 /var/log/ntpd.log | grep -a DNS|wc -l
 39915
root@MPM-4006:~# tail -40000 /var/log/ntpd.log | grep -a -v DNS
2020-03-19T02:39:10 ntpd[12274]: ERR: ntpd exiting on signal 15 (Terminated)
2020-03-19T02:39:10 ntpd[12274]: PROTO: SHM(2) 9612 82 demobilize assoc 43954
2020-03-19T02:39:10 ntpd[12274]: PROTO: 127.127.28.2 unlink local addr 127.0.0.1 -> <null>
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 8012 82 demobilize assoc 43955
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 8012 82 demobilize assoc 43956
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 8012 82 demobilize assoc 43957
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 8012 82 demobilize assoc 43958
2020-03-19T02:39:10 ntpd[12274]: PROTO: SHM(0) 9412 82 demobilize assoc 43959
2020-03-19T02:39:10 ntpd[12274]: PROTO: 127.127.28.0 unlink local addr 127.0.0.1 -> <null>
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 8812 82 demobilize assoc 43960
2020-03-19T02:39:10 ntpd[12274]: PROTO: 0.0.0.0 001d 0d kern kernel time sync disabled
2020-03-19T02:39:11 ntpd[19607]: INIT: Using SO_TIMESTAMPNS
2020-03-19T02:39:11 ntpd[19607]: IO: Listen and drop on 0 v6wildcard [::]:123
2020-03-19T02:39:11 ntpd[19607]: IO: Listen and drop on 1 v4wildcard 0.0.0.0:123
2020-03-19T02:39:11 ntpd[19607]: IO: Listen normally on 2 lo 127.0.0.1:123
2020-03-19T02:39:11 ntpd[19607]: IO: Listen normally on 3 lo [::1]:123
2020-03-19T02:39:11 ntpd[19607]: IO: Listening on routing socket on fd #20 for interface updates
2020-03-19T02:39:11 ntpd[19607]: PROTO: 127.127.28.2 8011 81 mobilize assoc 21309
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 8011 81 mobilize assoc 21310
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 8011 81 mobilize assoc 21311
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 8011 81 mobilize assoc 21312
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 8011 81 mobilize assoc 21313
2020-03-19T02:39:11 ntpd[19607]: PROTO: 127.127.28.0 8011 81 mobilize assoc 21314
2020-03-19T02:39:11 ntpd[19607]: CONFIG: configpeers: Ignoring duplicate '127.127.28.2'
2020-03-19T02:39:11 ntpd[19607]: CONFIG: configpeers: Ignoring duplicate '127.127.28.0'
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 8811 81 mobilize assoc 21315
2020-03-19T02:39:11 ntpd[19607]: SYNC: Found 10 servers, suggest minsane at least 3
2020-03-19T02:39:11 ntpd[19607]: INIT: This system has a 32-bit time_t.
2020-03-19T02:39:11 ntpd[19607]: INIT: This ntpd will fail on 2038-01-19T03:14:07Z.
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 c01d 0d kern kernel time sync enabled
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 c012 02 freq_set kernel 7.502304 PPM
2020-03-19T02:39:11 ntpd[19607]: PROTO: 0.0.0.0 c016 06 restart
2020-03-19T02:39:11 ntpd[19607]: INIT: OpenSSL 1.1.0g  2 Nov 2017, 1010007f
2020-03-19T02:39:11 ntpd[19607]: NTSc: Using system default root certificates.
2020-03-19T02:39:12 ntpd[19607]: PROTO: SHM(2) 8014 84 reachable
2020-03-19T02:39:12 ntpd[19607]: PROTO: SHM(2) 901a 8a sys_peer
2020-03-19T02:39:12 ntpd[19607]: PROTO: 0.0.0.0 c415 05 clock_sync
2020-03-19T02:39:17 ntpd[19607]: PROTO: SHM(0) 8014 84 reachable
2020-03-19T02:39:17 ntpd[19607]: PROTO: 0.0.0.0 0418 08 no_sys_peer
2020-03-19T02:39:49 ntpd[19607]: PROTO: SHM(2) 912a 8a sys_peer
2020-03-19T02:40:05 ntpd[19607]: PROTO: 0.0.0.0 0428 08 no_sys_peer
2020-03-19T02:40:13 ntpd[19607]: PROTO: SHM(2) 913a 8a sys_peer
2020-03-19T02:40:21 ntpd[19607]: PROTO: 0.0.0.0 0438 08 no_sys_peer
2020-03-19T02:40:32 ntpd[19607]: PROTO: SHM(2) 914a 8a sys_peer
2020-03-19T02:40:37 ntpd[19607]: PROTO: 0.0.0.0 0448 08 no_sys_peer
2020-03-19T02:41:41 ntpd[19607]: PROTO: SHM(2) 915a 8a sys_peer
2020-03-19T02:41:49 ntpd[19607]: PROTO: 0.0.0.0 0458 08 no_sys_peer
2020-03-19T02:41:57 ntpd[19607]: PROTO: SHM(2) 916a 8a sys_peer
2020-03-19T02:42:05 ntpd[19607]: PROTO: 0.0.0.0 0468 08 no_sys_peer
2020-03-19T02:42:13 ntpd[19607]: PROTO: SHM(2) 917a 8a sys_peer
2020-03-19T02:42:21 ntpd[19607]: PROTO: 0.0.0.0 0478 08 no_sys_peer
2020-03-19T02:42:45 ntpd[19607]: PROTO: SHM(2) 918a 8a sys_peer
2020-03-19T02:42:53 ntpd[19607]: PROTO: 0.0.0.0 0488 08 no_sys_peer
2020-03-19T02:43:17 ntpd[19607]: PROTO: SHM(2) 919a 8a sys_peer
2020-03-19T02:43:25 ntpd[19607]: PROTO: 0.0.0.0 0498 08 no_sys_peer
2020-03-19T02:43:57 ntpd[19607]: PROTO: SHM(2) 91aa 8a sys_peer
2020-03-19T02:44:05 ntpd[19607]: PROTO: 0.0.0.0 04a8 08 no_sys_peer
2020-03-19T02:44:13 ntpd[19607]: PROTO: SHM(2) 91ba 8a sys_peer
2020-03-19T02:45:01 ntpd[19607]: PROTO: 0.0.0.0 04b8 08 no_sys_peer
2020-03-19T02:45:25 ntpd[19607]: PROTO: SHM(2) 91ca 8a sys_peer
2020-03-19T02:45:33 ntpd[19607]: PROTO: 0.0.0.0 04c8 08 no_sys_peer
2020-03-19T02:45:57 ntpd[19607]: PROTO: SHM(2) 91da 8a sys_peer
2020-03-19T02:46:13 ntpd[19607]: PROTO: 0.0.0.0 04d8 08 no_sys_peer
2020-03-19T02:47:17 ntpd[19607]: PROTO: SHM(2) 91ea 8a sys_peer
2020-03-19T02:47:25 ntpd[19607]: PROTO: 0.0.0.0 04e8 08 no_sys_peer
2020-03-19T02:47:41 ntpd[19607]: PROTO: SHM(2) 91fa 8a sys_peer
2020-03-19T02:47:57 ntpd[19607]: PROTO: 0.0.0.0 04f8 08 no_sys_peer
2020-03-19T04:47:44 ntpd[19607]: PROTO: SHM(2) 911b 8b clock_event clk_no_reply
2020-03-19T04:47:49 ntpd[19607]: PROTO: SHM(0) 911b 8b clock_event clk_no_reply
2020-03-19T04:48:40 ntpd[19607]: PROTO: SHM(2) 8113 83 unreachable
2020-03-19T04:48:40 ntpd[19607]: PROTO: SHM(2) 8114 84 reachable
2020-03-19T05:21:25 ntpd[19607]: PROTO: SHM(2) 911a 8a sys_peer
2020-03-19T05:27:25 ntpd[19607]: PROTO: SHM(2) 912a 8a sys_peer
2020-03-19T05:28:29 ntpd[19607]: PROTO: SHM(2) 913a 8a sys_peer
2020-03-19T05:29:25 ntpd[19607]: PROTO: SHM(2) 914a 8a sys_peer
2020-03-19T05:33:41 ntpd[19607]: PROTO: SHM(2) 915a 8a sys_peer
2020-03-19T05:35:09 ntpd[19607]: PROTO: SHM(2) 916a 8a sys_peer
2020-03-19T05:39:41 ntpd[19607]: PROTO: SHM(2) 917a 8a sys_peer
2020-03-19T05:53:01 ntpd[19607]: PROTO: SHM(2) 918a 8a sys_peer
2020-03-19T05:59:57 ntpd[19607]: PROTO: SHM(2) 919a 8a sys_peer
2020-03-19T06:00:53 ntpd[19607]: PROTO: SHM(2) 91aa 8a sys_peer
2020-03-19T06:20:37 ntpd[19607]: PROTO: SHM(2) 91ba 8a sys_peer
2020-03-19T06:30:37 ntpd[19607]: PROTO: SHM(2) 91ca 8a sys_peer
2020-03-19T06:31:09 ntpd[19607]: PROTO: SHM(2) 91da 8a sys_peer
Thanks,
-Nick
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