If your docker has [AppArmor](https://wiki.ubuntu.com/AppArmor) enabled, running mysql in privileged mode with docker driver will have the issue [#7401](https://github.com/kubernetes/minikube/issues/7401).
There is a workaround - see [moby/moby#7512](https://github.com/moby/moby/issues/7512#issuecomment-61787845).