FS#72898 - kwin_x11 gets stuck

Attached to Project: Arch Linux
Opened by Andris Pavenis (andris) - Thursday, 02 December 2021, 05:45 GMT
Last edited by Antonio Rojas (arojas) - Sunday, 06 February 2022, 12:21 GMT
Task Type Bug Report
Category Packages: Extra
Status Closed
Assigned To No-one
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:

kwin_x11 gets stuck randomly (usually on window resize).
Mouse cursor stays in resize form. No reactions on mouse buttons press or keyboard. Mouse cursor moves.
Attempt to kill kwin_x11:
- SIGTERM - does not work
- SIGKILL - killed

Restarted kwin_x11 and after that it works. Problem has appeared randomly several times. Sometimes I was able to restart kwin_x11. Sometimes there were no reaction to keyboard after killing kwin_x11. Happens several times in a day.

Additional info:
* system:
Dell Precision 3561, Intel(R) Core(TM) i7-11850H, 64GB RAM, NVIDIA T1200 Laptop GPU
* package version(s)
[root@ap ~]# pacman -Q kwin
kwin 5.23.3-1

* config and/or log files etc.
* link to upstream bug report, if any



Steps to reproduce:
   kwin_x11.backtrace (22.9 KiB)
This task depends upon

Closed by  Antonio Rojas (arojas)
Sunday, 06 February 2022, 12:21 GMT
Reason for closing:  No response
Comment by Antonio Rojas (arojas) - Thursday, 02 December 2021, 15:46 GMT
Does it work if you downgrade to kernel 5.14?
Comment by Andris Pavenis (andris) - Thursday, 02 December 2021, 17:07 GMT
Installed linux-lts 5.10.83-1. Perhaps there is no need to install exactly 5.14 if 5.15 is suspected.
Upgrade to 5.15 happened about the same time when I began to experience these random freezes.
Testing will take some time as freezes did not happen very often (no more than several times per day).
Comment by Andris Pavenis (andris) - Sunday, 05 December 2021, 08:32 GMT
  • Field changed: Percent Complete (100% → 0%)
Reproduced with kernel Linux ap 5.10.83-1-lts:

'killall -9 kwin_x11' from terminal and after that "Alt-F2" and restarting kwin_x11 fixed session
Comment by Antonio Rojas (arojas) - Monday, 06 December 2021, 09:11 GMT
please do test with 5.14. It is perfectly possible that a regression affects both linux and linux-lts.
Comment by Aleksei Kharlamov (derlafff) - Sunday, 06 February 2022, 11:52 GMT
I am not sure if it's the same bug, but I experience it a lot with kwin_wayland session:

* Exists on linux-5.15 and linux-lts-5.10
* Revert to linux-5.14 helps
* Affects plasma, kwin, other components like screenlocker, causes frequent crashes
* For example, plasma does not crash, but stops updating the screen. So I can click on buttons, but applets do not update their state, clock does not go forward, etc...
* Another example: after unlocking the screen, screenlocker does not disappear until I go to another tty and back

Hardware:

* Dell XPS 13 9380
* i7-8565U
* Intel WhiskeyLake-U GT2 [UHD Graphics 620]
* kwin 5.23.5-1
Comment by Antonio Rojas (arojas) - Sunday, 06 February 2022, 12:21 GMT
No, that is a recent regression in qtwayland which is being worked on

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