I'm running, as host, Ubuntu 19.10 with kernel 5.3.0-40-generic. In the guest, Ubuntu 18.04.4 with kernel 5.30.0-40-generic.
When I launch the Android Emulator from Android Studio, the entire guest freezes. I tried 4.15.0-60 on guest, same problem. Tried 4.15.0-1050-oem on host, same problem.
Problem not related to Android Studio emulator, happens on virt-manager too. Seems totally related to KVM
So the problem is:
running any KVM emulation inside the guest makes the guest freeze