https://bugs.kde.org/show_bug.cgi?id=400788

--- Comment #3 from Vlad Zagorodniy <vladz...@gmail.com> ---
First of all, you have to re-package kwin so it has debug symbols. See
https://wiki.archlinux.org/index.php/Debug_-_Getting_Traces#CMAKE_.28KDE.29_applications

* sudo pacman -S asp
* asp export kwin
* cd kwin
  Adjust PKGBUILD accordingly to the wiki page
* makepkg -i

Then follow https://community.kde.org/KWin/Debugging, e.g.
* ssh from another machine to your computer

* gdb --pid `pidof kwin_wayland`
  (gdb) continue

* do something to crash kwin

* dump the backtrace
  (gdb) bt

when you submitted the backtrace, install kwin from the extra repo:
* sudo pacman -S extra/kwin

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