qemu-system-x86_64 segfaults with kernel 3.5.0 qemu-kvm 1.1.1 stable is running fine for me with RHEL 6 2.6.32 based kernel. But with 3.5.0 kernel qemu-system-x86_64 segfaults while i'm trying to install ubuntu 12.04 server reproducable. You find three backtraces here: http://pastebin.com/raw.php?i=xCy2pEcP Stefan this thread and this fix http://thread.gmane.org/gmane.comp.emulators.kvm.devel/95314/focus=1338226 are about the same issue, apparently. Please try it and see if it fixes you issue too. [Expired for QEMU because there has been no activity for 60 days.]