boot: 0.769 graphic: 0.649 device: 0.637 PID: 0.356 performance: 0.307 other: 0.281 semantic: 0.267 vnc: 0.250 network: 0.250 files: 0.241 debug: 0.189 socket: 0.147 permissions: 0.142 KVM: 0.109 RHEL 6.1 guest fails to boot with vhost Tried to boot 6.1 guest on hs22 blade with/without vhost enabled. With vhost enabled, guest aborted with core dump. installed guest with autotest. Command : /usr/local/bin/qemu-system-x86_64 -name 'vm1' -nodefaults -vga std -monitor unix:'/tmp/monitor-humanmonitor1-20111108-193209-fc6O',server,nowait -serial unix:'/tmp/serial-20111108-193209-fc6O',server,nowait -drive file='/home/pradeep/autotest/client/tests/kvm/images/rhel6.1-64.qed',index=0,if=virtio,cache=none -device virtio-net-pci,netdev=idQhUaOc,mac='9a:b7:ea:c9:0e:0d',id='idVR6XQz' -netdev tap,id=idQhUaOc,vhost=on,script=/home/pradeep/qemu-ifup-latest -m 1024 -smp 8 -vnc :0 -monitor stdio QEMU 0.15.91 monitor - type 'help' for more information (qemu) Aborted (core dumped) host: 2.6.32-214 m/c: hs22 vhost modules are loaded. i hits this issue on host: 3.1.0+ also Can you still reproduce this problem with the latest version of QEMU from http://qemu-project.org/Download and recent host and guest Linux kernels? [Expired for QEMU because there has been no activity for 60 days.]