This may be the same thing we are seeing on OpenStack compute nodes since upgrade. Hard crash, no output to logs, local console occasionally shows a kernel panic ending with Fatal Exception in Interrupt, shutting down CPU's.
We are seeing this reliably across 10 nodes which have been upgraded, and it doesn't happen on other nodes which are all running 3.13.0-62-generic. Have tried downgrading QEMU to 2.0, and OpenVswitch to 2.0.2-0ubuntu0.14.04.2, neither of which stop the problem happening. Hardware has also been stress tested and no memory or CPU issues. Still trying to find a reliable recreate, but seems to be connected with live migrations happening on other machines, where the node that crashes is hosting virtual instances on the same virtual networks on which the migration is happening. ** Attachment added: "Screen Shot 2016-01-21 at 05.15.02.png" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535088/+attachment/4553994/+files/Screen%20Shot%202016-01-21%20at%2005.15.02.png -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1535088 Title: Linux Generic Kernel x -43 Status in linux package in Ubuntu: Invalid Bug description: kernel panic - not syncing : fatal exception in interrupt. shutting down cpus with NMI drm_kms_helper : panic occurred, switching back to text console. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-74-generic 3.13.0-74.118 ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30 Uname: Linux 3.13.0-74-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: omniedge 2249 F.... pulseaudio /dev/snd/controlC0: omniedge 2249 F.... pulseaudio CurrentDesktop: Unity Date: Sun Jan 17 08:22:29 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2015-01-29 (353 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: Dell Inc. Inspiron 3542 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-74-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-74-generic N/A linux-backports-modules-3.13.0-74-generic N/A linux-firmware 1.127.19 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 11/14/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 02RD2H dmi.board.vendor: Dell Inc. dmi.board.version: A05 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA05:bd11/14/2014:svnDellInc.:pnInspiron3542:pvrNotSpecified:rvnDellInc.:rn02RD2H:rvrA05:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Inspiron 3542 dmi.product.version: Not Specified dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535088/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp