I get a 100% reproduceable crash by switching "Viewport Shading" to "Rendered" and "Render Engine" to "Cycles".
We didn't hit this on Fedora 33, but started seeing it as soon as we upgraded to F34.
See also: https://retrace.fedoraproject.org/faf/reports/109986/
The first impression suggests a bug linked to python3.9 found on F34. Similar report mentioned the issue so let's move there.
*** This bug has been marked as a duplicate of bug 1950230 ***