Bug 474824

Summary: QtWebEngine processes consume 100% CPU and cause system freezing
Product: [Applications] Falkon Reporter: ksso <kepasi>
Component: generalAssignee: David Rosca <nowrep>
Status: REPORTED ---    
Severity: normal CC: nate
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: pop up message of qbitorrent doesn't allowing to restart (one restart try), after second try, freezes
Hi, I open konsole before the restart in order to make the screenshot (also open before shutter)
other screenshot same event
another event freezing panel

Description ksso 2023-09-23 23:56:12 UTC 
Created attachment 161836 [details]
pop up message of qbitorrent doesn't allowing to restart (one restart try), after second try, freezes

SUMMARY
***
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***
qbitorrent (and others maybe) doesnt allow me to restart the pc, need to use power button of keyboard because if I try more than one time, the pc freezes

STEPS TO REPRODUCE
1. use qbitorrents (it seems)
2. try to restart
3. try to restart again, and it freezes

OBSERVED RESULT
cant restart and freezes

EXPECTED RESULT
restart easy




SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Operating System: Kubuntu 23.04
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.0-33-generic (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5500U with Radeon Graphics
Memory: 3.1 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP Laptop 15-ef2xxx
Comment 1 Nate Graham 2023-09-25 18:14:25 UTC 
What freezes? Are you still able to move the mouse pointer, at least? Does Alt+Tab switch windows?
Comment 2 ksso 2023-09-25 21:17:12 UTC 
(In reply to Nate Graham from comment #1)
> What freezes? Are you still able to move the mouse pointer, at least? Does
> Alt+Tab switch windows?

the panel freezes, the desktop (program windows slow down but works), the mouse pointer works
because the panel freezes I can't continue trying to restart or shut down through command and need to use power button of the keyboard, each time

by the way, for this issue I need to work for some time or open many programs for this to happen (I guess), when is just turned on I can restart (even with the pop-up notification qbitorrent that cancel the restart command, but again need to do at least twice, that is click restart button on the panel)
Comment 3 ksso 2023-09-25 21:23:36 UTC 
Alt+Tab switch windows works (it seems)
Comment 4 Nate Graham 2023-09-28 16:32:38 UTC 
When this happens, can you use Alt+F2 to open KRunner, use it to launch Konsole, use Konsole to run the `top` program, and see if anything is consuming excessive CPU resources? Like, 100%? Or even 50%.
Comment 5 ksso 2023-09-29 02:47:01 UTC 
Created attachment 161942 [details]
Hi, I open konsole before the restart in order to make the screenshot (also open before shutter)
Comment 6 ksso 2023-09-29 02:47:59 UTC 
Created attachment 161943 [details]
other  screenshot same event
Comment 7 ksso 2023-09-29 03:02:26 UTC 
Created attachment 161944 [details]
another event freezing panel

in order to take the screenshots need to open before restart the konsole and shutter apps

in order to freeze the panel (main bar) just needed to open some apps and restart several times
Comment 8 Nate Graham 2023-09-29 17:58:19 UTC 
It appears that Falkon's QtWebEngine processes are going haywire and consuming all available system resources. Moving the bug report to Falkon.