kernel-packages team mailing list archive

[Matthew Anderson <matthewa@xxxxxxxxxxxx>]

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

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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%.

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