Bug 883421 - forking type service with BusName assigned stucks in "deactivating" state
Summary: forking type service with BusName assigned stucks in "deactivating" state
Alias: None
Product: Fedora
Classification: Fedora
Component: systemd
Version: 18
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Michal Schmidt
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2012-12-04 14:58 UTC by Jan Vcelak
Modified: 2014-02-05 22:54 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-02-05 22:54:13 UTC
Type: Bug

Attachments (Terms of Use)

Description Jan Vcelak 2012-12-04 14:58:16 UTC
Description of problem:

This is a content of a service file provided by tuned package:

Description=Dynamic System Tuning Daemon

ExecStart=/usr/sbin/tuned -d


Tuned is a forking service, but it also provides a DBus interface. (We do not use DBus activation yet.) Documentation recommends to set BusName= even if we are forking service.

Version-Release number of selected component (if applicable):

How reproducible:
with some luck

Steps to Reproduce:
1. systemctl start tuned
2. systemctl stop tuned
3. systemctl start tuned
4. systemctl stop tuned
5. ...
Actual results:
After a few "rounds" 'systemctl stop tuned' will hang.

$ systemctl status tuned                             # in other terminal
tuned.service - Dynamic System Tuning Daemon
          Loaded: loaded (/usr/lib/systemd/system/tuned.service; disabled)
          Active: deactivating (stop-sigkill) (Result: timeout) since Tue, 2012-12-04 14:54:48 CET; 1min 34s ago
         Process: 3980 ExecStart=/usr/sbin/tuned -d (code=exited, status=0/SUCCESS)
        Main PID: 3982
          CGroup: name=systemd:/system/tuned.service

Now I have to wait till the internal timeout expires and tuned is considered as stopped.

Expected results:

Systemd considers tuned to be stopped after the tuned daemon terminates.

Additional info:

If I comment out BusName= in service file, everything seems to work fine.

Comment 1 Michal Schmidt 2012-12-06 23:29:54 UTC
I can reproduce this. Some observations so far:
- systemd produces a warning "%s has a D-Bus service name specified, but is not of type dbus. Ignoring.", which is clearly incorrect, because the name is not ignored. The name is used as an indirect source to detect the main PID of the service.
- The utility of this kind of detection is dubious. Its interaction with the detection from PIDFile is undocumented and racy.
- It's also buggy: After a successful detection of the main PID it fails to add this PID to the set of PIDs watched by the manager. Consequently, when the SIGCHLD finally arrives for the PID, the service unit is not notified.
- There is a fallback in manager_dispatch_sigchld() to map the PID to the unit using the cgroup. This does not seem to work. The task is a zombie by then and zombies lose their cgroup membership, I think.

Comment 3 Fedora End Of Life 2013-12-21 15:13:55 UTC
This message is a reminder that Fedora 18 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 4 Fedora End Of Life 2014-02-05 22:54:13 UTC
Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is
no longer maintained, which means that it will not receive any further
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