https://bugzilla.kernel.org/show_bug.cgi?id=42829 Summary: KVM Guest with virtio network driver loses network connectivity Product: Virtualization Version: unspecified Kernel Version: 3.3.0-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: kvm AssignedTo: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx ReportedBy: stefan.bosak@xxxxxxxxx CC: avi@xxxxxxxxxx Regression: Yes Description: ------------ Running KVM guests with virtio network interfaces, the guest will (probably in some - unidentified - circumstances) stop receiving packets. A tcpdump on the bugged interface will show only ARP requests being sent by the server and unanswered. Possible workarounds: Temporarily: - restart network interface in guest Permanent: - use e1000 network driver as replacement of virtio_net driver How to reproduce: ----------------- 1) start KVM guest: qemu-kvm -nodefaults -name vps -chroot /chroot -runas kvm -pidfile /var/run/kvm/vps.pid -vnc 1.2.3.4:0 -vga std --full-screen -smp 2 -m 1g -cpu host -mem-path /hugepages -mem-prealloc -kvm-shadow-memory 1g -enable-kvm -daemonize -rtc base=localtime,clock=host,driftfix=none -balloon virtio -net nic,model=virtio,vlan=0,macaddr=52:54:00:33:22:11 -net bridge,br=br0,vlan=0 -drive aio=native,index=0,media=disk,cache=none,if=virtio,file=vps.img -boot order=c,menu=off & 2) generate huge trafic (after few minutes virtio network card crashed): from host to guest: screen ping 10.8.7.2 -s 65507 screen iperf -s -i 1 -f M from guest to host: screen ping 10.8.7.1 -s 65507 screen iperf -c 10.8.7.2 -i 1 -f M 3) restart guest network interface and repeat step 2) until network crash again Above situation occurs on (my tests): host kernel 3.3+ qemu-kvm 1.0+ any guest Linux 2.6+ - 3.3+ kernel any guest Windows 7+ Same situation described from other users on some forums: http://bugs.centos.org/view.php?id=5526 http://serverfault.com/questions/362038/ qemu-kvm-virtual-machine-virtio-network-freeze-under-load (possible, not tested old patch) Please fix above crashing of virtio_net driver. Thank you for your time. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
