[chrony-users] rtc is not being updated

[Gernot Nusshall <gernot@xxxxxxxxxxxx>]

Hi,

i am not sure if i am experiencing a problem with chrony or the linux kernel.
I want the rtc to be updated with the 11-minute-mode of the linux kernel initiated with the chrony option „rtcsync“.
I was expecting that the rtc is getting updated because the adjtimex output set by chrony seems correct and the kernel config options are also set correctly, 
is there anything that i am missing?

thanks in advance,
Gernot

# set hwclock to something not equal local time/utc
root:~# hwclock --set --date 00:03:09
root:~# reboot
root:~# systemctl stop chronyd

# check if rtcsync is enabled
root:~# cat /etc/chrony/chrony.conf
logdir /var/log/chrony
logbanner 32
logchange 0.5
noclientlog
log measurements
log statistics
log tracking
makestep 1.0 -1
acquisitionport 123
manual
rtcsync
server 192.168.253.1 maxpoll 10

# start strace (start chronyd)
nohup strace -f -tt -o time.strace /usr/sbin/chronyd -u _chrony &
https://pastebin.com/g9aNHkzV

# check 11-minute-kernel-mode:
root:~# adjtimex --print
         mode: 0
       offset: 0
    frequency: -3562612
     maxerror: 16000000
     esterror: 16000000
       status: 64
time_constant: 2
    precision: 1
    tolerance: 32768000
         tick: 10000
     raw time:  1511209389s 189560us = 1511209389.189560
 return value = 5

# start uptime, local time, utc and rtc loop
root:~# while true; do   echo '===';   date; uptime; timedatectl | egrep '(Local|Universal|RTC) time';   sleep 1m; done > time.log
https://pastebin.com/4m7qPFWE

# check 11-minute-kernel-mode:
root:~# adjtimex --print
         mode: 0
       offset: 0
    frequency: 2965632
     maxerror: 16000000
     esterror: 16000000
       status: 64
time_constant: 2
    precision: 1
    tolerance: 32768000
         tick: 9999
     raw time:  1511211108s 459113us = 1511211108.459113
 return value = 5
 
# kernel config 'grep RTC config'
CONFIG_RTC_LIB=y
CONFIG_RTC_MC146818_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_SYSTOHC_DEVICE="rtc0"
# CONFIG_RTC_DEBUG is not set
# RTC interfaces
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
# CONFIG_RTC_DRV_TEST is not set
# I2C RTC drivers
# CONFIG_RTC_DRV_ABB5ZES3 is not set
# CONFIG_RTC_DRV_ABX80X is not set
# CONFIG_RTC_DRV_DS1307 is not set
# CONFIG_RTC_DRV_DS1374 is not set
# CONFIG_RTC_DRV_DS1672 is not set
# CONFIG_RTC_DRV_MAX6900 is not set
# CONFIG_RTC_DRV_RS5C372 is not set
# CONFIG_RTC_DRV_ISL1208 is not set
# CONFIG_RTC_DRV_ISL12022 is not set
# CONFIG_RTC_DRV_X1205 is not set
# CONFIG_RTC_DRV_PCF8523 is not set
# CONFIG_RTC_DRV_PCF85063 is not set
# CONFIG_RTC_DRV_PCF8563 is not set
# CONFIG_RTC_DRV_PCF8583 is not set
# CONFIG_RTC_DRV_M41T80 is not set
# CONFIG_RTC_DRV_BQ32K is not set
# CONFIG_RTC_DRV_S35390A is not set
# CONFIG_RTC_DRV_FM3130 is not set
# CONFIG_RTC_DRV_RX8010 is not set
# CONFIG_RTC_DRV_RX8581 is not set
# CONFIG_RTC_DRV_RX8025 is not set
# CONFIG_RTC_DRV_EM3027 is not set
CONFIG_RTC_DRV_RV8803=y
# SPI RTC drivers
CONFIG_RTC_I2C_AND_SPI=y
# SPI and I2C RTC drivers
# CONFIG_RTC_DRV_DS3232 is not set
# CONFIG_RTC_DRV_PCF2127 is not set
# CONFIG_RTC_DRV_RV3029C2 is not set
# Platform RTC drivers
# CONFIG_RTC_DRV_CMOS is not set
# CONFIG_RTC_DRV_DS1286 is not set
# CONFIG_RTC_DRV_DS1511 is not set
# CONFIG_RTC_DRV_DS1553 is not set
# CONFIG_RTC_DRV_DS1685_FAMILY is not set
# CONFIG_RTC_DRV_DS1742 is not set
# CONFIG_RTC_DRV_DS2404 is not set
# CONFIG_RTC_DRV_STK17TA8 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_M48T35 is not set
# CONFIG_RTC_DRV_M48T59 is not set
# CONFIG_RTC_DRV_MSM6242 is not set
# CONFIG_RTC_DRV_BQ4802 is not set
# CONFIG_RTC_DRV_RP5C01 is not set
# CONFIG_RTC_DRV_V3020 is not set
# on-CPU RTC drivers
# HID Sensor RTC drivers
# CONFIG_RTC_DRV_HID_SENSOR_TIME is not set
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