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Created attachment 527088 [details] the log of core dump Description of problem: RHEL6.2 host crashed when starting a rhel 6.2 guest with vhost on and doing netperf from host to guest host: kernel:2.6.32-206.el6.x86_64 qemu-kvm:qemu-kvm-0.12.1.2-2.195.el6.x86_64 Version-Release number of selected component (if applicable): kernel: How reproducible: 100% CLI:/usr/libexec/qemu-kvm -m 2G -smp 2 -cpu cpu64-rhel6,+x2apic -usb -usbdevice tablet -rtc base=localtime,clock=host,driftfix=slew -drive file=/home/RHEL6.2-64-virtio-0823.qcow2,format=qcow2,if=none,id=drive-ide0-0-0,werror=stop,rerror=stop,cache=none -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,mac=00:10:20:2d:39:23,bus=pci.0,addr=0x4,id=net0 -boot order=cdn -uuid 3290efd3-7c9e-44f9-b5f7-af0f3a1b3066 -rtc-td-hack -no-kvm-pit-reinjection -monitor stdio -name rhel6.2-2011.09.07 -spice port=5830,disable-ticketing -vga qxl Steps to Reproduce: 1.start VM with CLI listed above(vhost=on) 2.start netpert server on host netserver 3.Run netperf client on guest netperf -H 10.66.1.19 -p 12865 -l 180 Actual results: Host crashed ,and reboot. the host error: Write failed: Broken pipe Expected results: Host won't crash,network between guest and host works well. Additional info: