This is affecting KVM guests too, as far as I can tell. I just did a clean install of Fedora 10 x86_64, did a yum -y update, got KVM setup, and installed Fedora 11 Beta x86_64 as a guest. Sound is getting stuck repeating over and over again shortly after starting up. https://bugzilla.redhat.com/show_bug.cgi?id=496714