[Stable Update] 2021-09-24 - Kernels, LibreOffice, Browsers, Pipewire, RHVoice, KDE Frameworks, Mesa

After this update, my system is acting totally weird.

I have Manjaro since February 2019, and everything is always been good.

But since this update I firstly encountered this issue:

Then I also noticed that mpv (has been updated from 1:0.33.1-2 to 1:0.33.1-3) after a while of playing, will freeze all the system: luckily I can go to TTY2 and there executing systemctl reboot.
But I am upset… I had a rock solid system, but since this update, has become unreliable…

EDIT: I downgraded mpv, but the issue persists: after a while (about five minutes of playing) the system completely freeze…

EDIT 2:

I switch from stable branch to testing branch:

sudo pacman-mirrors --api --set-branch testing
sudo pacman-mirrors --fasttrack 5 && sudo pacman -Syyu
[2021-09-27T22:27:49+0200] [PACMAN] Running 'pacman -Syyu'
[2021-09-27T22:27:49+0200] [PACMAN] synchronizing package lists
[2021-09-27T22:27:50+0200] [PACMAN] starting full system upgrade
[2021-09-27T22:28:06+0200] [ALPM] transaction started
[2021-09-27T22:28:06+0200] [ALPM] upgraded libxnvctrl (470.63.01-1 -> 470.74-1)
[2021-09-27T22:28:06+0200] [ALPM] upgraded manjaro-release (21.1.4-1.0 -> 21.1.5-1)
[2021-09-27T22:28:06+0200] [ALPM] upgraded matcha-gtk-theme (20210823-1 -> 20210924-1)
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] 
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] Firefox theme
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] See /usr/share/doc/matcha-gtk-theme/firefox/README.md
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] 
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] Gedit theme
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] See /usr/share/doc/matcha-gtk-theme/gedit/README.md
[2021-09-27T22:28:06+0200] [ALPM-SCRIPTLET] 
[2021-09-27T22:28:06+0200] [ALPM] upgraded mhwd-nvidia (470.63.01-1 -> 470.74-1)
[2021-09-27T22:28:06+0200] [ALPM] transaction completed
[2021-09-27T22:28:07+0200] [ALPM] running '30-systemd-update.hook'...
[2021-09-27T22:28:07+0200] [ALPM] running 'rebuild-detector.hook'...

(libxnvctrl ?? Is for nVidia, but on my system there is no nVidia, only Intel).

What happened:

The system freezed again for few seconds (about 15 seconds), then become responsive again.
In the Journal log I don’t see (or I am not able to search about) nothing about.

I’ll update this message: I am not totally sure of what is happening.

EDIT 3: nothing to do: I was playing again using mpv and the system freeze again.

EDIT 4: I discovered that when the system freeze, instead of doing systemctl reboot, I can execute pkill -KILL -u $myusername and the system will become usable again. But this is a workaround; shouldn’t happen.

EDIT 5: I currently using smplayer (tried various times, also for more than an hour of playing) and the system freeze doesn’t occured; the funny thing is that smplayer using mpv as video backend.