[chrony-users] repeating "Can't synchronise: no selectable sources" log msgs ... but sources _are_ selected, and chrony _is_ sync'd. (mis)config or bug?

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

I run client

	chronyd --version
		chronyd (chrony) version 4.0 (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +NTS +SECHASH +IPV6 +DEBUG)

local config is

	cat /etc/chrony.conf
		server 10.0.1.123 iburst trust minpoll 0 maxpoll 0 xleave presend 9
		port 0
		driftfile /var/lib/chrony/chrony.drift
		makestep 10 3
		maxupdateskew 100.0
		maxdistance 10
		hwclockfile /etc/adjtime
		rtcsync
		local stratum 10
		keyfile /etc/chrony.keys
		leapsectz right/UTC
		logdir /var/log/chrony
		logchange 0.5
		mailonchange admin.time@xxxxxxxxxxx 1.0
		dumpdir /var/lib/chrony
		dumponexit
		sourcedir /run/chrony-dhcp

where

	host 10.0.1.1
		1.1.0.10.in-addr.arpa domain name pointer edge.example.com.

is a local chronyd server.

In journal, I see repeating, ~ randomly-spaced

	...
	Oct 09 10:18:21 svr03.example.com chronyd[5922]: Forward time jump detected!

	Oct 09 10:18:21 svr03.example.com chronyd[5922]: Can't synchronise: no selectable sources

	Oct 09 10:18:24 svr03.example.com chronyd[5922]: Selected source 10.0.1.123

	Oct 09 10:43:36 svr03.example.com chronyd[5922]: Forward time jump detected!
	Oct 09 10:43:36 svr03.example.com chronyd[5922]: Can't synchronise: no selectable sources
	Oct 09 10:43:38 svr03.example.com chronyd[5922]: Selected source 10.0.1.123
	Oct 09 11:23:49 svr03.example.com chronyd[5922]: Forward time jump detected!
	Oct 09 11:23:49 svr03.example.com chronyd[5922]: Can't synchronise: no selectable sources
	Oct 09 11:23:52 svr03.example.com chronyd[5922]: Selected source 10.0.1.123
	Oct 09 12:18:30 svr03.example.com chronyd[5922]: Forward time jump detected!
	Oct 09 12:18:30 svr03.example.com chronyd[5922]: Can't synchronise: no selectable sources
	Oct 09 12:18:33 svr03.example.com chronyd[5922]: Selected source 10.0.1.123
	...

it clearly selects a source

	chronyc sources
		MS Name/IP address         Stratum Poll Reach LastRx Last sample
		===============================================================================
		^* edge.example.com       2   0   377     5  -2286ns[-2245ns] +/-   14ms

and is tracking

	chronyc tracking
		Reference ID    : AC1E0B64 (edge.example.com)
		Stratum         : 3
		Ref time (UTC)  : Fri Oct 09 19:25:08 2020
		System time     : 0.000000001 seconds slow of NTP time
		Last offset     : +0.000000040 seconds
		RMS offset      : 0.000017781 seconds
		Frequency       : 91408.953 ppm slow
		Residual freq   : -0.000 ppm
		Skew            : 1.714 ppm
		Root delay      : 0.024624441 seconds
		Root dispersion : 0.002169367 seconds
		Update interval : 2.0 seconds
		Leap status     : Normal

is that "Can't synchronise: no selectable sources" msg an actual problem, caused by my (mis)config, or a red-herring?

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