https://bugs.kde.org/show_bug.cgi?id=522039
Bug ID: 522039
Summary: Switching Activities makes entire desktop unresponsive
— D-Bus communication with kactivitymanagerd breaks
Classification: Plasma
Product: plasmashell
Version First 6.7.0
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Activities in general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
STEPS TO REPRODUCE
=================
1. Log into a Plasma 6.7 session (fresh login)
2. Verify the desktop is fully responsive:
- Panel works normally
- Dolphin right-click displays context menu without crashing
- Dolphin settings dialog opens promptly
3. Verify org.kde.kuiserver responds on D-Bus:
$ dbus-send --session --dest=org.kde.kuiserver \
--type=method_call --print-reply \
/JobViewServer org.freedesktop.DBus.Introspectable.Introspect
(returns valid introspection data)
4. Switch to a different Activity using the Activity Switcher
5. Attempt any panel interaction, or re-run the D-Bus command above
OBSERVED RESULT
===============
After switching Activities:
- The entire KDE panel becomes unresponsive
- D-Bus communication with org.kde.kuiserver fails:
$ dbus-send --session --dest=org.kde.kuiserver \
--type=method_call --print-reply \
/JobViewServer org.freedesktop.DBus.Introspectable.Introspect
Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply.
Possible causes include: the remote application did not send a reply,
the message bus security policy blocked the reply, the reply timeout
expired, or the network connection was broken.
- Applications that depend on D-Bus services crash:
- Dolphin crashes with SIGSEGV on right-click
- Dolphin stderr shows: "Failed to check which JobView API is supported"
- Opening "Configure Dolphin" takes ~60 seconds (D-Bus timeout)
EXPECTED RESULT
===============
Switching Activities should not break D-Bus communication.
The panel and all applications should remain fully responsive after an Activity
switch.
ROOT CAUSE
==========
After switching Activities, kactivitymanagerd appears to become unresponsive
on the D-Bus session bus. This causes a cascade of failures:
- Other D-Bus services (including org.kde.kuiserver) become unreachable
- The panel freezes
- Any application that makes a D-Bus call to these services either hangs or
crashes
This is consistent with the pattern in bug 435097 (D-Bus timeouts caused by
unresponsive kactivitymanagerd) and bug 314575 (resource issues linked to
kactivitymanagerd and the Activities context menu).
The kactivitymanagerd 6.7 release included significant D-Bus-related changes
("Fix dbus types for ActivityInfo arrays", "Add DBus2 lifecycle methods to
ActivityRunner", etc.), which may have introduced a regression.
SOFTWARE/OS VERSIONS
===================
Operating System: Fedora Linux 44
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 7.0.12-201.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 8500G w/ Radeon 740M Graphics
Memory: 32 GiB of RAM (30.4 GiB usable)
Graphics Processor 1: AMD Radeon 740M Graphics
Graphics Processor 2: NVIDIA GeForce GTX 960
REGRESSION
==========
Yes — this worked correctly before the Plasma 6.6 → 6.7 upgrade.
ADDITIONAL NOTES
================
After a fresh reboot, kactivitymanagerd and all D-Bus services work correctly.
The issue only manifests after switching Activities.
Recommended diagnostic commands to run after the problem triggers (when the
panel is frozen):
# Is kactivitymanagerd still running?
ps aux | grep kactivitymanagerd
# Can we reach kactivitymanagerd on D-Bus?
dbus-send --session --dest=org.kde.ActivityManager \
--type=method_call --print-reply \
/ActivityManager/Activities \
org.kde.ActivityManager.Activities.ListActivities
# Check systemd service status
systemctl --user status plasma-kactivitymanagerd.service
# Check for coredumps
coredumpctl list | grep kactivitymanagerd
SEE ALSO
========
- Bug 435097 (30s D-Bus timeout caused by kactivitymanagerd)
- Bug 314575 (Dolphin freeze related to kactivitymanagerd)
- Bug 466193 (Plasmashell races kactivitymanagerd startup)
- Bug 456536 (Activity manager daemon not running error)
--
You are receiving this mail because:
You are watching all bug changes.
