[chrony-users] Fatal error : adjtimex() failed

["Tomalak Geret'kal" <tom@xxxxxxxxx>]

Hi

I'm replacing ntpd with chronyd on a busybox-driven Linux 
2.6.21 ARM device that takes time from a local GPS receiver 
with PPS and/or remote NTP servers. We've never been able to 
get ntpd working with the ATOM PPS driver and we have some 
fiddly time-step requirements that led us to decide that a 
timepps-enabled chrony build would be more suitable for our 
needs.

But, after an hour or so of lovely NMEA and PPS -steered 
time, for reasons unknown I'm no longer able to get chrony 
to even run.

In the syslog:

Aug 20 17:32:50 sw200319 daemon.info chronyd[2186]: chronyd version 1.26 starting
Aug 20 17:32:50 sw200319 daemon.info chronyd[2186]: Linux kernel major=2 minor=6 patch=21
Aug 20 17:32:50 sw200319 daemon.info chronyd[2186]: hz=100 shift_hz=7 freq_scale=0.99902439 nominal_tick=10000 slew_delta_tick=833 max_tick_bias=1000
Aug 20 17:32:50 sw200319 daemon.crit chronyd[2186]: Fatal error : adjtimex() failed

I read that adjtimex() can fail when the HZ and SHIFT_HZ 
values are incorrect, but I checked the source for our 
kernel and in it HZ is set at100. I tried "linux_hz 1000" 
for good measure, with no effect.

I power-cycled the device, with no effect.

My config:

refclock PPS /dev/pps0 lock GPS
refclock SHM 0 offset 0.5 delay 0.1 refid GPS
keyfile /etc/chrony.keys
commandkey 1
driftfile /etc/chrony.drift


and removing more or less any of these entries doesn't 
appear to make a difference.

What else might I be missing?

Best regards
Tom

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