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Created attachment 520313 [details] backtrace of kernel panic Description of problem: host kernel panic while host running multiple TCP_RR.backtrace in attachment. Version-Release number of selected component (if applicable): kernel-2.6.32-191.el6.x86_64 qemu-kvm-0.12.1.2-2.184.el6.x86_64 How reproducible: always Steps to Reproduce: 1.boot guest on the host. /usr/libexec/qemu-kvm /home/kvm_autotest_root/images/RHEL-Server-6.2-64-virtio.qcow2 -netdev tap,id=hn0,vhost=on -device virtio-net-pci,netdev=hn0,mac=00:00:05:00:00:05 -m 4G -cpu cpu64-rhel6,+sse2,+x2apic -rtc base=utc,clock=host -usbdevice tablet -no-kvm-pit-reinjection -M rhel6.2.0 -enable-kvm -vnc :10 2.run netserver on the guest (ip is 192.168.100.3) 3.run multiple TCP_RR on the host (configure netperf with --enable-burst) netperf -H 192.168.100.3 -t TCP_RR -- -b 25 -r 256,25 Actual results: host kernel panic while host running multiple TCP_RR. Expected results: Additional info: # sysctl -a |grep bridge net.bridge.bridge-nf-call-arptables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-filter-vlan-tagged = 0 net.bridge.bridge-nf-filter-pppoe-tagged = 0 # ethtool -k eth1 Offload parameters for eth1: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off # ethtool -i eth1 driver: ixgbe version: 3.4.8-k firmware-version: 0.9-3 bus-info: 0000:0f:00.1 # cat /proc/cmdline ro root=/dev/mapper/VolGroup-LogVol_root rd_LVM_LV=VolGroup/LogVol_root rd_LVM_LV=VolGroup/LogVol_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=129M@0M processor.max_cstate=1 nmi_watchdog=0 console=tty0 console=ttyS0,115200 rhgb quiet intel_iommu=off