[Bug 673705] [NEW] running guests freeze when a guest is powered down

[Mathias Gug]

Public bug reported:

Binary package hint: qemu-kvm

I'm running multiple guests via libvirt+kvm on my laptop. When I power
off one them, all remaining running guests freeze for 30 seconds.

On the host, top shows the ksmd process as using the most cpu.

I've attached a sar output file. One guest was powered down 02:56:07 PM.
The remaining running guest froze until 02:56:37 PM.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: qemu-kvm 0.12.5+noroms-0ubuntu7
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Wed Nov 10 14:58:57 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
KvmCmdLine:
 UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
 117      28028     1  9 155582 296184 2 14:54 ?        00:00:26 /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 390 -smp 1,sockets=1,cores=1,threads=1 -name t-test2 -uuid d013faff-add9-48d4-8aa3-70a24f8717b2 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/t-test2.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot cd -drive file=/home/mathiaz/reference/vms/t-test2/disk.qcow2,if=none,id=drive-virtio-disk0,boot=on,format=qcow2 -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:ae:d2:51,bus=pci.0,addr=0x3 -net tap,fd=40,vlan=0,name=hostnet0 -usb -vnc 127.0.0.1:1 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
MachineType: LENOVO 3249CTO
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=97b2f151-9aee-416a-8156-0585e0766d3d ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_CA.utf8
 SHELL=/bin/bash
SourcePackage: qemu-kvm
dmi.bios.date: 01/26/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6QET35WW (1.05 )
dmi.board.name: 3249CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6QET35WW(1.05):bd01/26/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 3249CTO
dmi.product.version: ThinkPad X201
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug maverick

-- 
running guests freeze when a guest is powered down
https://bugs.launchpad.net/bugs/673705
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