Bug 450810

Summary:	[cgroup] is not to set correctly when launching applications from taskmanager for apps that fork on launch
Product:	[Plasma] plasmashell	Reporter:	Riccardo Robecchi <sephiroth_pk>
Component:	Task Manager and Icons-Only Task Manager widgets	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	CONFIRMED ---
Severity:	normal	CC:	brunopitrus, kde, nate, nicolas.fella, pqwoerituytrueiwoq, r2b2x3+kdebug
Priority:	NOR
Version First Reported In:	5.24.5
Target Milestone:	1.0
Platform:	Neon
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=475736
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	systemd-cgls output

Description Riccardo Robecchi 2022-02-24 17:21:02 UTC

Created attachment 147103 [details]
systemd-cgls output

SUMMARY
Latte appears not to set the correct cgroup when launching applications, so these appear as being part of Latte itself in System Monitor.


STEPS TO REPRODUCE
1. Launch an application like Skype
2. Open System Monitor

OBSERVED RESULT
The application launched is not displayed as separate from Latte.

EXPECTED RESULT
The application launched is displayed as separate from Latte.

SOFTWARE/OS VERSIONS
Linux: KDE neon
KDE Plasma Version: 5.24.1
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
According to discussion in bug 433328, this behaviour is not due to System Monitor, but to the application responsible for launching the new process, which in this case is Latte.

Comment 1 Michail Vourlakos 2022-02-24 17:51:13 UTC

Dont you have the same issue with plasma taskmanagers?

Comment 2 Nicolas Fella 2022-02-25 00:40:40 UTC

I can't reproduce this with stock taskmanager or kickoff, but I can with Latte

Comment 3 Michail Vourlakos 2022-03-20 15:55:52 UTC

no idea what Latte can do for this.

Latte is just using Plasma.TasksModel.requestActivate() function. It should be enough.

Comment 4 Michail Vourlakos 2022-03-25 07:38:57 UTC

if you add a plasma taskmanager inside Latte do you have the same issue?

Comment 5 Riccardo Robecchi 2022-03-25 08:58:59 UTC

(In reply to Michail Vourlakos from comment #4)
> if you add a plasma taskmanager inside Latte do you have the same issue?

Yes, I can reproduce the issue by using the Plasma task manager on Latte.

Comment 6 Michail Vourlakos 2022-03-25 09:32:44 UTC

(In reply to Riccardo Robecchi from comment #5)
> (In reply to Michail Vourlakos from comment #4)
> > if you add a plasma taskmanager inside Latte do you have the same issue?
> 
> Yes, I can reproduce the issue by using the Plasma task manager on Latte.

just guessing, maybe Latte has been built in Debug mode instead of Release mode?

Comment 7 Riccardo Robecchi 2022-03-25 10:11:13 UTC

I can actually reproduce when starting from the application launcher, if I do it e.g. Skype is grouped under plasmashell. So I would say it's not about Latte, after all.

Comment 8 David Edmundson 2022-06-17 07:59:33 UTC

I know skype forks on startup, so it's possibly a race.

1 we start skype's launcher
2 we put that in it's own cgroup after the fact
3 skype's launcher forks into real skype

if 2 and 3 occur the wrong way round as it's in parallel it would explain what we're seeing. We do have a code path that makes it race-free but it required users to have a modernish systemd.

I'll try to reproduce, otherwise I'll ask you to test something.

Comment 9 pqwoerituytrueiwoq 2022-06-21 03:39:28 UTC

I am able to get libreoffice calc to open under this cgroup by opening it via Application Menu 2.0 (not kicker) and Application Launcher 2.0 (kicker)

this does NOT happen when opening via file in dolphin or using alt+F2/Alt+space

is this related or a separate issue?

Comment 10 Nate Graham 2024-08-16 15:46:50 UTC

*** Bug 486106 has been marked as a duplicate of this bug. ***