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

[Nick Burkitt]

Hi Gary.

 

But, I thought you were using gpsd, thus the NTPsec SHM driver is

what you want.

I'm in the grasping-at-straws stage at the moment. At least, I'm willing to try stuff to see if it helps.

"Thinking" (guessing) is not good. Easy to know:

 

# ppstest /dev/pps0

This works fine. We're revisiting old territory here...

root@MPM-4006:~# ppstest /dev/pps0

trying PPS source "/dev/pps0"

found PPS source "/dev/pps0"

ok, found 1 source(s), now start fetching data...

source 0 - assert 1584581522.999957214, sequence: 977 - clear 0.000000000, sequence: 0

source 0 - assert 1584581523.999954811, sequence: 978 - clear 0.000000000, sequence: 0

source 0 - assert 1584581524.999955588, sequence: 979 - clear 0.000000000, sequence: 0

source 0 - assert 1584581525.999958890, sequence: 980 - clear 0.000000000, sequence: 0

source 0 - assert 1584581526.999955756, sequence: 981 - clear 0.000000000, sequence: 0

source 0 - assert 1584581527.999956309, sequence: 982 - clear 0.000000000, sequence: 0

source 0 - assert 1584581528.999955507, sequence: 983 - clear 0.000000000, sequence: 0

I've gone through the exercise of capturing the falling edge, too. It doesn't help.

I'll have to ask, yet again:

 

have you tried to set minsane?

Yes, here's my ntp.conf. We've been here before, too.

minsane 1

refclock shm unit 2 refid PPS minpoll 3 maxpoll 3 prefer flag4 1

server 0.us.pool.ntp.org iburst

server 1.us.pool.ntp.org iburst

server 2.us.pool.ntp.org iburst

server 3.us.pool.ntp.org iburst

refclock shm unit 0 refid GPS minpoll 3 maxpoll 4 time1 0.080 flag4 1

restrict default kod limited nomodify nopeer noquery

restrict -6 default kod limited nomodify nopeer noquery

restrict 127.0.0.1

restrict -6 ::1

driftfile /var/lib/ntp/ntp.drift

statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats

filegen loopstats file loopstats type day enable

filegen peerstats file peerstats type day enable

filegen clockstats file clockstats type day enable

logfile /var/log/ntpd.log

logconfig =syncall +clockall +peerall +sysall

whnat do you ntpd logs show?

ntpd.log shows this after restarting with -D 10 (using "tail -1000 /var/log/ntpd.log | grep -a -v DNS", since no network connection)

2020-03-19T01:37:50 ntpd[11856]: PROTO: SHM(2) 9112 82 demobilize assoc 13949
2020-03-19T01:37:50 ntpd[11856]: PROTO: 127.127.28.2 unlink local addr 127.0.0.1 -> <null>
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 8012 82 demobilize assoc 13950
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 8012 82 demobilize assoc 13951
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 8012 82 demobilize assoc 13952
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 8012 82 demobilize assoc 13953
2020-03-19T01:37:50 ntpd[11856]: PROTO: SHM(0) 9112 82 demobilize assoc 13954
2020-03-19T01:37:50 ntpd[11856]: PROTO: 127.127.28.0 unlink local addr 127.0.0.1 -> <null>
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 8812 82 demobilize assoc 13955
2020-03-19T01:37:50 ntpd[11856]: PROTO: 0.0.0.0 001d 0d kern kernel time sync disabled
2020-03-19T01:37:50 ntpd[12274]: INIT: Using SO_TIMESTAMPNS
2020-03-19T01:37:50 ntpd[12274]: IO: Listen and drop on 0 v6wildcard [::]:123
2020-03-19T01:37:50 ntpd[12274]: IO: Listen and drop on 1 v4wildcard 0.0.0.0:123
2020-03-19T01:37:50 ntpd[12274]: IO: Listen normally on 2 lo 127.0.0.1:123
2020-03-19T01:37:50 ntpd[12274]: IO: Listen normally on 3 lo [::1]:123
2020-03-19T01:37:50 ntpd[12274]: IO: Listening on routing socket on fd #20 for interface updates
2020-03-19T01:37:50 ntpd[12274]: PROTO: 127.127.28.2 8011 81 mobilize assoc 43954
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 8011 81 mobilize assoc 43955
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 8011 81 mobilize assoc 43956
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 8011 81 mobilize assoc 43957
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 8011 81 mobilize assoc 43958
2020-03-19T01:37:50 ntpd[12274]: PROTO: 127.127.28.0 8011 81 mobilize assoc 43959
2020-03-19T01:37:50 ntpd[12274]: CONFIG: configpeers: Ignoring duplicate '127.127.28.2'
2020-03-19T01:37:50 ntpd[12274]: CONFIG: configpeers: Ignoring duplicate '127.127.28.0'
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 8811 81 mobilize assoc 43960
2020-03-19T01:37:50 ntpd[12274]: SYNC: Found 10 servers, suggest minsane at least 3
2020-03-19T01:37:50 ntpd[12274]: INIT: This system has a 32-bit time_t.
2020-03-19T01:37:50 ntpd[12274]: INIT: This ntpd will fail on 2038-01-19T03:14:07Z.
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 c01d 0d kern kernel time sync enabled
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 c012 02 freq_set kernel 7.666809 PPM
2020-03-19T01:37:50 ntpd[12274]: PROTO: 0.0.0.0 c016 06 restart
2020-03-19T01:37:50 ntpd[12274]: INIT: OpenSSL 1.1.0g  2 Nov 2017, 1010007f
2020-03-19T01:37:50 ntpd[12274]: NTSc: Using system default root certificates.
2020-03-19T01:37:51 ntpd[12274]: PROTO: SHM(2) 8014 84 reachable
2020-03-19T01:37:51 ntpd[12274]: PROTO: SHM(2) 901a 8a sys_peer
2020-03-19T01:37:51 ntpd[12274]: PROTO: 0.0.0.0 c415 05 clock_sync
2020-03-19T01:37:56 ntpd[12274]: PROTO: SHM(0) 8014 84 reachable
2020-03-19T01:37:56 ntpd[12274]: PROTO: 0.0.0.0 0418 08 no_sys_peer
2020-03-19T01:39:00 ntpd[12274]: PROTO: SHM(2) 912a 8a sys_peer
2020-03-19T01:39:08 ntpd[12274]: PROTO: 0.0.0.0 0428 08 no_sys_peer
2020-03-19T01:39:16 ntpd[12274]: PROTO: SHM(2) 913a 8a sys_peer

Are there other logs I should look at? 

Thanks,

-Nick