Bug 359465

I am using ubuntu 15.10/wily with the kubuntu backports PPA, which at the moment provides plasmashell 5.5.3.

Every time I resume my computer from suspend to RAM plasmashell freezes and does not react to any input. At the same time krunner is working fine and I can start applications or use already open ones normally.

The situation can be resolved by issuing killall plasmashell; plasmashell in krunner.

Additionally the mouse cursor is reacting with a lot of jitter to mouse movements, until a notification that eth0 has been re-connected appears. Sometimes there is a notification that eth0 has gone down (probably a delayed notification from the suspend process).

Thomas Lübking noted that this behaviour is caused by a deadlock between kwin and plasmashell. Please see https://bugs.kde.org/show_bug.cgi?id=358245#c6 for details.

I will attach the backtraces.



Reproducible: Always

Steps to Reproduce:
1. Start KDE session.
2. Suspend machine to RAM.
3. Resume machine.

There seems to be a possibility to circumvent the crash:
1. Log in normally on boot (Terminal 7)
2. Use the session manager (krunner -> sessions) to create a second session for another user
3. Log in on second session (Terminal 8) and stay on that terminal
4. Suspend system
5. Resume system
6. Switch from Terminal 8 to Terminal 7 with the original session and find the screen locked and plasmashell not crashed.

Actual Results:  
kwin/Plasmashell does not react to input. Applications and krunner work.


Expected Results:  
kwin/Plasmashell does react to inputs. Applications and krunner work.


Possibly related bugs:
https://bugs.kde.org/show_bug.cgi?id=352423
https://bugs.kde.org/show_bug.cgi?id=355457