[Bug 799166] [NEW] KVM virtual machines crash with host on linux-image-2.6.32-32-server on AMD processor

[Seb James]

Public bug reported:

Binary package hint: qemu-kvm

Since the 31st May I've been seeing random crashes in the virtual
machines that we run on an AMD processor based system in our office. We
run Ubuntu 10.04 on this server, which is a Dell T105 and I keep it
patched with all the updates. The virtual machines we run are all very
similar - they're our own build of Linux based around a 2.6.31 kernel.

On 31st of May, from looking at dpkg files, I see that I upgraded the
system's kernel to linux-image-2.6.32-32-server.

The crashes occur most commonly when these machines are doing lots of
processing, with libpoppler, ghostscript and our own software using most
of the cpu time.

I found that if I downgrade the kernel from linux-image-2.6.32-32-server
to linux-image-2.6.32-31-server on the Dell T105, then the system is
stable.

I tried upgrading the kernel to a prerelease linux-
image-2.6.32-33-server but still saw the freezes.

I tried the same virtual machines on two Dell T105 servers (1 dual-core
AMD Opteron 1214 processor) and on a Dell R210 server, running an Intel
Xeon processor. The crashes can be reliably caused on both of the AMD
based machines, but it seems that on the Intel based machine, linux-
image-2.6.32-32-server will happily run KVM virtual machines without
crashes.

Looks like one of changes in the kernel between 2.6.32-31 and 2.6.32-32
is the cause of this problem.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: qemu-kvm 0.12.3+noroms-0ubuntu9.9
ProcVersionSignature: Ubuntu 2.6.32-32.62-generic 2.6.32.38+drm33.16
Uname: Linux 2.6.32-32-generic x86_64
Architecture: amd64
Date: Sat Jun 18 15:52:52 2011
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
KvmCmdLine:
 UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
 root      1934     1  5 178312 201544 0 15:49 ?        00:00:12 /usr/bin/kvm -S -M pc-0.11 -enable-kvm -m 498 -smp 1 -name vpa5900 -uuid 770320e2-2d12-92cf-e5a9-97da88c3fd27 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vpa5900.monitor,server,nowait -monitor chardev:monitor -boot c -drive file=/var/vm/vpa5900/sda.qcow2,if=scsi,index=0,boot=on,format=qcow2,cache=none -net nic,macaddr=52:54:00:61:36:00,vlan=0,model=virtio,name=virtio.0 -net tap,fd=35,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 192.168.0.18:0 -vga std
 root      1986     1  5 179013 204496 0 15:49 ?        00:00:13 /usr/bin/kvm -S -M pc-0.11 -enable-kvm -m 498 -smp 1 -name vpa5901 -uuid 57cff0db-ab19-01fe-a2ea-3e127473c0e2 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vpa5901.monitor,server,nowait -monitor chardev:monitor -boot c -drive file=/var/vm/vpa5901/sda.qcow2,if=scsi,index=0,boot=on,format=qcow2,cache=none -net nic,macaddr=52:54:00:4e:3e:33,vlan=0,model=virtio,name=virtio.0 -net tap,fd=36,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 192.168.0.18:1 -vga std
 root      2117     1 82 182383 337276 0 15:49 ?        00:02:48 /usr/bin/kvm -S -M pc-0.11 -enable-kvm -m 512 -smp 1 -name vpa11000 -uuid 7fd6b400-6ef4-20f4-b1e3-1ecc413ecdf7 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vpa11000.monitor,server,nowait -monitor chardev:monitor -boot c -drive file=/var/vm/vpa11000/sda.qcow2,if=scsi,index=0,boot=on,format=qcow2,cache=none -net nic,macaddr=52:54:00:03:72:ac,vlan=0,model=virtio,name=virtio.0 -net tap,fd=39,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 192.168.0.18:5100 -vga std
Lsusb:
 Bus 002 Device 003: ID 413c:2003 Dell Computer Corp. Keyboard
 Bus 002 Device 002: ID 093a:2510 Pixart Imaging, Inc. Hama Optical Mouse
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge T105
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-32-generic root=UUID=a5f141c2-ffe1-4084-aea8-0a071c334561 ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: qemu-kvm
dmi.bios.date: 02/01/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.0
dmi.board.name: 0RR825
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.1.0:bd02/01/2008:svnDellInc.:pnPowerEdgeT105:pvr(none):rvnDellInc.:rn0RR825:rvrA00:cvnDellInc.:ct7:cvr:
dmi.product.name: PowerEdge T105
dmi.product.version: (none)
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug lucid

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to qemu-kvm in Ubuntu.
https://bugs.launchpad.net/bugs/799166

Title:
  KVM virtual machines crash with host on linux-image-2.6.32-32-server
  on AMD processor

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/799166/+subscriptions