The bug occurred when upgrading from 12.04.1 (3.2 kernel) to 14.04 (3.13 kernel). Booting with the old 3.2 kernel resolves the problem.
Guest command line - qemu-system-x86_64 -enable-kvm -name test -S-machine pc-i440fx-1.4,accel=kvm,usb=off -cpu qemu64,hv_relaxed -m 4096 -realtimemlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid e00d6bde-ca3e-8e6c-2c92-d5b5ec632b9a -no-user-config -nodefaults -chardevsocket,id=charmonitor,path=/var/lib/libvirt/qemu/test.monitor,server,nowait -monchardev=charmonitor,id=monitor,mode=contro l-rtcbase=localtime,driftfix=slew -no-hpet -no-shutdown -bootstrict=on -devicepiix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=rbd:ssd/test:auth_supported=none,if=none,id=drive-virtio-disk0-devicevirtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw-deviceide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdevtap,fd=24,id=hostnet0,vhost=on,vhostfd=25 -devicevirtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:48:81:8a,bus=pci.0,addr=0x3-chardevpty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0-vnc127.0.0.1:0 -devicecirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 Attached is a perf record of the qemu process whilst the fault was occuring. ** Attachment added: "perf.data" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1322441/+attachment/4118045/+files/perf.data -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1322441 Title: Windows guest unstable after random amount of time Status in “linux” package in Ubuntu: New Bug description: Ubuntu 14.04, all updates done as of 23/5/2014 Kernel : Linux 3.13.0-24-generic Qemu : 1.7.1 and 2.0.0 tested Tested using both Xeon 5620 and 5520 processors, 48GB RAM. Anywhere from 20 minutes for 3+ hours after booting Windows guests become unstable. Guest appear to freeze intermittently (VNC console unresponsive, network pings dropped to guest, frozen IO) for 20-60 seconds at a time which repeats constantly every few minutes and guests do not recover unless QEMU is killed and the guest is started again. Whilst the guest is frozen CPU usage of the QEMU process jumps to 100-150%. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1322441/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
