'state 4' means ntpd thinks it knows the frequency offset needed to stay in
sync, and that ntpd thinks it can track time "well" and the clock is in
sync.

I believe your 'tinker step 0' is the problem.

I suspect you are losing clock interrupts somehow and with the 'step 0' ntpd
cannot correct this.  I do not know this, but it's one of the first things I
think of when I see somebody is running linux.

Also, if you are running ntpdate (or sntp) to set the clock before starting
ntpd, there is no need to start ntpd with -g.

It may be instructive to try 4.2.0 with your "stock" ntp.conf file and see
how that behaves, and then try the same experiment with a recent ntp-dev
tarball.

H

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