Dear Michael,
> I'm not able to reproduce the issue either.
> ... this looks like something specific to your system configuration, a
> default jessie system doesn't seem to be affected.
I found what causes reproducibility: editing the file
/etc/pam.d/common-session
and removing or commenting out the optional(?!!) line
session optional pam_systemd.so
makes the issue reproducible. - Curiously, removing that line also
causes GDM3 to become unusable (and I was thinking it was just too buggy
to be used... which it is, really).
I wonder how that line came to be missed on my machines: I upgraded from
wheezy (which was upgraded from previous releases).
So, to reproduce the issue, on a "plain jessie" machine (e.g. freshly
installed from debian-8.2.0-amd64-netinst.iso):
- Edit the file
/etc/pam.d/common-session
and remove or comment out the line
session optional pam_systemd.so
then reboot.
- Log in to the machine; probably not via GDM3 as that might not work
at all; not via getty as then the issue will not show(?!!); but log
in via XDM, or via telnetd or sshd. (Wonder if sshd login with keys
would bypass PAM and then not need the editing above.)
- Become root (log in as such, or use su).
- As root, do commands:
# Set things up
mkdir /sys/fs/cgroup/cpu/mytest
echo $$ > /sys/fs/cgroup/cpu/mytest/tasks
# Check it is there
grep . /sys/fs/cgroup/cpu/mytest/tasks
# Do the systemd thing
systemctl daemon-reload
systemctl start anacron
# See it gone
grep . /sys/fs/cgroup/cpu/mytest/tasks
Cheers, Paul
Paul Szabo p...@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia
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