[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
A few comments here. First, some of upstream qemu's position is that nested KVM is not for enterprise installs in the first place. (Others feel that if there are bugs, they should be worked out) Second, the bug appears to be a soft luckup. It seems to me the bug should be about that. If you've opened a separate bug about the lockup itself, please mark it both against qemu and linux. If not, then let's mark this bug as also affecting linux. Thirdly, there's the question of how to (assuming we decide to) implement this. Should /etc/init/qemu-kvm do something like grep -qi qemu /proc/cpuinfo echo 0 /sys/kernel/mm/ksm/run ? Note that you can currently do this yourself by having your VM install (say at cloud-init or in juju install section) set KSM_ENABLED=0 in /etc/default/qemu-kvm I'm not sure how to mark the priroity of this bug. If the bug is about the soft lockup, that's high priority (against linux). if it's about disabling ksm, that's low priority (against qemu, since there's a workaround) ** Changed in: qemu (Ubuntu) Importance: Undecided = Low ** Changed in: qemu (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
Moving to qemu; qemu-kvm is the source package only up to precise. ** Package changed: qemu-kvm (Ubuntu) = qemu (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
** Package changed: ubuntu = qemu-kvm (Ubuntu) -- 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/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
** Attachment added: apport.qemu-kvm.3i3ndao3.apport https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+attachment/4303546/+files/apport.qemu-kvm.3i3ndao3.apport -- 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/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
ProblemType: Bug ApportVersion: 2.14.1-0ubuntu3.6 Architecture: amd64 Date: Thu Jan 22 10:37:18 2015 DistroRelease: Ubuntu 14.04 Ec2AMI: ami-000f Ec2AMIManifest: FIXME Ec2AvailabilityZone: nova Ec2InstanceType: m1.medium Ec2Kernel: aki-0002 Ec2Ramdisk: ari-0002 Package: qemu-kvm (not installed) ProcEnviron: TERM=xterm-256color SHELL=/bin/bash PATH=(custom, no user) LANG=en_US.UTF-8 XDG_RUNTIME_DIR=set ProcVersionSignature: User Name 3.13.0-44.73-generic 3.13.11-ckt12 SourcePackage: qemu Tags: trusty ec2-images Uname: Linux 3.13.0-44-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) _MarkForUpload: True -- 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/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
Please, bear in mind I have already modified the KSM value for this node not to crash, that is the only change made to this system after the issue, other than rebooting it. ** Attachment added: apport.qemu-system-x86.hhh4e6d9.apport https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+attachment/4303547/+files/apport.qemu-system-x86.hhh4e6d9.apport -- 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/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
apport file for linux. ** Attachment added: apport.linux-image-3.13.0-44-generic.61de1tqv.apport https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1413540/+attachment/4303622/+files/apport.linux-image-3.13.0-44-generic.61de1tqv.apport -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
apport file for linux. ** Attachment added: apport.linux-image-3.13.0-44-generic.61de1tqv.apport https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1413540/+attachment/4303621/+files/apport.linux-image-3.13.0-44-generic.61de1tqv.apport -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
I can reproduce this issue and hand a VM over to whoever is going to triage in a hung state. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
** Changed in: linux (Ubuntu) Assignee: (unassigned) = Chris J Arges (arges) ** Changed in: linux (Ubuntu) Importance: Undecided = High -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
@gema, please re-do the 'apport-collect 1413540' (with the new, corrected package names) ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
apport for qemu ** Attachment added: apport.qemu.pnfp6lff.apport https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1413540/+attachment/4303623/+files/apport.qemu.pnfp6lff.apport -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1413540] Re: qemu-kvm package enables KSM on VMs
@serge-hallyn: First step is to debug this issue and see if its a reasonable fix. If that's possible then we should leave qemu alone. Second if we want to disable KSM for nested VMs relying on a 'QEMU' cpu isn't sufficient if someone uses a different -cpu flag. We could do: grep -q Booting paravirtualized kernel on KVM /var/log/kern.log echo 0 /sys/kernel/mm/ksm/run Or use tools like virt-what. Regardless I'll work on step 1. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1413540 Title: qemu-kvm package enables KSM on VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413540/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
