[Pkg-systemd-maintainers] Bug#723936: Bug#723936: systemd: fails to upgrade - same behavior

[Michael Biebl]

Hi,

Am 26.09.2013 13:47, schrieb Michael Biebl:
> Sep 23 20:48:39 Cunegonde systemd[1]: Reexecuting.
> 
> 
> Those reload requests are done before systemd has been re-executed.

So, I was finally able to reproduce the issue. The log with the problems
related to Reexcuting gave some hints.

My initial approach was, to install a minimal wheezy system, install
systemd + pcscd + bluez, boot with init=/bin/systemd, make a
dist-upgrade to jessie.
With that approach, I couldn't reproduce the problem. Apparently
there are packages like libselinux which tell init (PID 1) to re-execute
during the upgrade and this somehow prevented the issue to show up.

What I did to successfully reproduce the issue:
- Install minimal wheezy system + systemd + pcscd + bluez.
- apt-mark hold udev systemd pcscd bluez
- apt-get dist-upgrade to jessie
- reboot, with init=/bin/systemd
- apt-mark unhold udev systemd pcscd bluez
- apt-get dist-upgrade (which now only upgrades the rest)

So the sequence of events afaics which leads to the problem is:
- systemd is upgraded from v44 to v204 (which had major changes)
- pid 1 is systemd v44
- unpack new systemd
- a package calls invoke-rc.d foo start, which runs systemctl
daemon-reload. This makes the old systemd v44 pick up the new configuration.
- A systemctl start foo.service then results in the failure.
- After v204 has been fully setup and re-executed in systemd.postint,
the problem is gone.

So the problem afaics is that we run daemon-reload and
start|stop|restart requests while systemd is in an
unconfigured|inconsistent state.
Upgrading systemd before the upgrade from v44 to v204 would obviously
solve that issue, but I don't see an easy why how to enforce that.



Michael



-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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