The only reference I found to get_tasks_recursive seems far away in
cgmanager
(http://changelogs.ubuntu.com/changelogs/pool/main/c/cgmanager/cgmanager_0.32-4ubuntu1.1/changelog
and https://linuxcontainers.org/it/cgmanager/manpages/man1/cgm.1.html)
Yet I found that my Xenial Test system didn't
I can use cgm to do some getrecursive calls without issue, like this:
cgm gettasksrecursive freezer
With that I think my quick debugging has reached its end, but lets
assign to the proper components now that we know.
** Package changed: shadow (Ubuntu) => cgmanager (Ubuntu)
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I see the same on 14.04, even without "-" on the su.
The test also lacked the -c for the command, and "-" would need to be at the
end or specified as "-l".
Also we might execute something that doesn't add output, to easen debugging
(/bin/true)
Anyway - that just refines the simple test, the
cgmanager is a service you can reach via dbus for cgroup management.
It is used in this case via libpam-cgm to "Create cgroups for user login
sessions"
I stopped the service and reran it in verbose mode
sudo /sbin/cgmanager -m name=systemd -v
Then in another console I tried to trigger the issue
I'm actually getting the same on xenial.
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https://bugs.launchpad.net/bugs/1534090
Title:
'call to get_tasks_recursive failed' errors from su
Status in
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: shadow (Ubuntu)
Status: New => Confirmed
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