`gnome-shell` crashes when opening file via Gtk portal

Mesa would be a good starting point: https://gitlab.freedesktop.org/mesa/mesa/-/issues

You should at least include the log you provided here that contains all the kernel messages. And you should include a backtrace of the crash with debug symbols. There should be some article in the Arch wiki how to get debug symbols using debuginfod. Then you can use the instructions from Stack Traces - GNOME Project Handbook

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