Public bug reported: If memory statistics are enabled for the memory baloon device in libvirt like this:
<memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> <stats period='10'/> </memballoon> Then qemu exits with "qemu-system-x86_64: Virtqueue size exceeded" after the VM is migrated or when starting the VM again after a managedsave. This bug is present since 2.0.0+dfsg-2ubuntu1.26 and was not present in 2.0.0+dfsg-2ubuntu1.24. It's most probably caused by the Fix for CVE-2016-5403. Steps to reproduce: 1. Create a VM with libvirt which contains the above memory balloon device 2. Start the VM and let the Linux kernel boot (bug does not appear if the kernel is not yet booted, eg. while in the PXE boot phase) 3. Issue a managedsave 4. Start the VM again 5. The VM is restored and "crashes" right after it starts running again. 6. You can find the qemu output "qemu-system-x86_64: Virtqueue size exceeded" in the log at /var/log/libvirt/vmname.log ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: qemu-system-x86 2.0.0+dfsg-2ubuntu1.26 ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39 Uname: Linux 3.13.0-93-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 Date: Thu Aug 11 08:39:33 2016 SourcePackage: qemu UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: qemu (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug third-party-packages trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1612089 Title: Fix for CVE-2016-5403 causes crash on migration if memory stats are enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1612089/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs