Unity freezes when compiling shader variants

Okay, first of: I know that there are multiple threads discussing the shader variants compiling just hanging for a long time, but this is not the case here.

I'm using Unity 2018.4.20f1 (building things for VRChat, so this specific version is required) on Linux. Everything was working fine before until yesterday.

Now when I'm trying to build & publish an avatar or a world from any previously working project, Unity starts to compile shader variants and will start to freeze at random shaders...

Unity freezes when compiling shader variants