Mathieu found the culprit, many thanks! This is due to some cleanup code
in udevd which wreaks havoc when not running under systemd, as it
assumes that it runs in its own cgroup (normally /system.slice/systemd-
udevd.service). src/udev/udevd.c on_post() has:
} else if (manager->cgroup)
/* cleanup possible left-over processes in our
cgroup */
cg_kill(SYSTEMD_CGROUP_CONTROLLER,
manager->cgroup, SIGKILL, false, true, NULL);
But under upstart processes don't run in cgroups, and hence
manager->cgroup is (almost surely) "/" and thus it kills all running
processes. We need to disarm this to only clean up if the cgroup is not
empty.
This can be reproduced fairly easily:
- Boot a trusty VM (cloud-image/autopkgtest image is fine)
- Install udisks2
- Change apt sources to xenial, install udev from xenial
- apt-get install --reinstall udisks2
The last command triggers udev rules and causes most processes to get
killed and restarted, which can be seen nicely in their startup time and
in /var/log/syslog.
** Changed in: systemd (Ubuntu)
Milestone: None => ubuntu-16.04
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https://bugs.launchpad.net/bugs/1555237
Title:
Upgrade from 14.04.4→ 16.04 dies midway taking out the session.
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