Description of problem: Rawhide (fc34) had non-functional networking in a VirtualBox VM after a routine upgrade using dnf. After many hours of selective installing using a working backup VM and a lot of cloning, I was able to isolate the problem to glib2. Version-Release number of selected component (if applicable): works ~ glib2-2.66.2-1.fc34.x86_64 breaks networking ~ glib2-2.67.0-1.fc34.x86_64 How reproducible: 100% reproducible. Steps to Reproduce: 1. Run updates which installs glib2-2.67.0-1.fc34.x86_64 Additional info: (1) I am running Rawhide Xfce and if I block glib2 with a --exclude=glib2* I can run updates and networking is fine. To be clear, as of the moment of writing this, I am 100% up to date with all updates EXCEPT for glib2. If I install glib2 networking is non-functional. (2) This is an issue for [at least] MATE and Xfce Rawhide. (3) For reasons I cannot explain Workstation (GNOME) does work with glib2-2.67.0-1.fc34.x86_64, but MATE and Xfce do not.
My Xfce installation was on a VM co-resident with MATE. MATE was installed first then Xfce was installed. I was using Xfce when drilling down to isolate the problem to glib2. However it looks like building a fresh Xfce only install from: Fedora-Everything-netinst-x86_64-Rawhide-20201103.n.0.iso Does work with glib2-2.67.0-1.fc34.x86_64. However building a fresh MATE only system with the same ISO as above does not work. So it looks like the issue is possibly with MATE only, and not Xfce after all, although a system with both on it does have the problem.
Latest compose in: Fedora-Everything-netinst-x86_64-Rawhide-20201108.n.0.iso Seems to have fixed the issue in that freshly built MATE systems have working networking now.