[Bug 714335] [NEW] KVM SMP Linux Guests Hang

[Brian Knoll]

Public bug reported:

Binary package hint: qemu-kvm

SMP Linux guests are hanging under KVM.  This does not happen always,
but at least 50% of the time or so.

If I start the guests with "-smp 1" or just completely omit the "-smp"
parameter this doesn't happen.

I can also say that it doesn't seem to happen on a Nehalem-based 8-core
Xeon-based machine I've tried it on, but it does happen on both an AMD
Phenom II 965 machine (the one this bug report is from) as well as an
AMD Phenom II 1090T-based machine.

I am starting the VMs from the command line, manually running qemu-kvm
with a command like the following:

qemu-system-x86_64 -m 1024 -smp 1 -cpu host -drive
file=/var/local/kvm/machine.qcow2,if=virtio,cache=off,boot=on -net
nic,model=virtio,macaddr=77:88:99:12:34:56 -net tap -nographic
-daemonize

Additional Information:

Description:	Ubuntu 10.04.2 LTS
Release:	10.04

qemu-kvm:
  Installed: 0.12.3+noroms-0ubuntu9.3
  Candidate: 0.12.3+noroms-0ubuntu9.3
  Version table:
 *** 0.12.3+noroms-0ubuntu9.3 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     0.12.3+noroms-0ubuntu9 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: qemu-kvm 0.12.3+noroms-0ubuntu9.3
ProcVersionSignature: Ubuntu 2.6.32-28.55-server 2.6.32.27+drm33.12
Uname: Linux 2.6.32-28-server x86_64
Architecture: amd64
Date: Sun Feb  6 19:11:57 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-28-server root=UUID=941072c0-f822-44b4-b61c-09b6daadcb7c ro quiet splash clocksource=pit
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: qemu-kvm
dmi.bios.date: 08/18/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1006
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785-M
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1006:bd08/18/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785-M:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug lucid

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https://bugs.launchpad.net/bugs/714335

Title:
  KVM SMP Linux Guests Hang