[pkg-ntp-maintainers] Bug#815904: ntp: Writes bogous time to hardware clock in combination with timesyncd

[Dominik George]

Package: ntp
Version: 1:4.2.8p4+dfsg-3+b1
Severity: normal

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ntp seems to write bogous dates to the hardware clock on shutdown when
used in combination with systemd-timesyncd.

Here's what happens on a system with a broken RTC, in terms that it does
not keep time through power cycles:

 1. System is powered on, RTC has 2010-01-10 (probably zero from BIOS).
 2. systemd-timesyncd comes up, reading last known time from disk
    (2016-02-11 in that case).
 3. ntp comes up and synchronises to the network (2016-02-25).
 4. System is shut down and rebooted without power cycle. The RTC now
    has 2022-02-17.

Remarkably, the offeset between 1. and 2. is not the same, but very
close to the one between 3. and 4.

This does not happen when ntp is disabled. In that case, the RTC has
2010-02-10 again after reboot.

- -- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.4.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ntp depends on:
ii  adduser      3.113+nmu3
ii  dpkg         1.18.4
ii  libc6        2.21-9
ii  libcap2      1:2.24-12
ii  libedit2     3.1-20150325-1+b1
ii  libopts25    1:5.18.7-3
ii  libssl1.0.2  1.0.2f-2
ii  lsb-base     9.20160110
ii  netbase      5.3

Versions of packages ntp recommends:
ii  perl  5.22.1-7

Versions of packages ntp suggests:
pn  ntp-doc  <none>

- -- no debconf information

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