For what it's worth, some bugs can be easier to reproduce on machines with lots of cores (that might explain why you couldn't reproduce it on your local laptop).
I recall that bug #1011792 never happened on our local 4-cores VM, but the same workload would lock up a 8-cores VM in a few hours. -- 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/1275809 Title: (docker/lxc) container restart causes kernel to lockup Status in “linux” package in Ubuntu: Triaged Bug description: After restarting some 'ghost' docker containers on precise with the raring-lts kernel, the kernel locks up and shows: [1095015.392057] BUG: soft lockup - CPU#0 stuck for 22s! [gunicorn:12804] ... (for each core) Here is the original, more docker focused bug report: https://github.com/dotcloud/docker/issues/3873 I could reproduce this bug with various kernel versions. I've set the softlockup_panic=1 kernel parameter to get some stack traces. See this gist for stack trace for 3.5 and 3.8 kernels (will add 3.11 any minute): https://gist.github.com/discordianfish/7886354d9a19b2084775 It also contains a small script to reproduce this, although I couldn't reproduce it in a vagrant VM just our Dell R710 systems so far. --- AlsaDevices: total 0 crw-rw---T 1 root audio 116, 1 Feb 3 09:45 seq crw-rw---T 1 root audio 116, 33 Feb 3 09:45 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.0.1-0ubuntu17.6 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: [Errno 2] No such file or directory CRDA: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 12.04 HibernationDevice: RESUME=UUID=e8d3c6ec-f202-480c-ac43-52ffbbbcb393 IwConfig: Error: [Errno 2] No such file or directory MachineType: Dell Inc. PowerEdge R710 MarkForUpload: True Package: linux (not installed) PciMultimedia: ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-35-generic root=/dev/mapper/ubuntu--vg-root ro console=tty0 console=ttyS1,115200 softlockup_panic=1 ProcVersionSignature: Ubuntu 3.8.0-35.52~precise1-generic 220.127.116.11 RelatedPackageVersions: linux-restricted-modules-3.8.0-35-generic N/A linux-backports-modules-3.8.0-35-generic N/A linux-firmware 1.79.9 RfKill: Error: [Errno 2] No such file or directory Tags: precise Uname: Linux 3.8.0-35-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: dmi.bios.date: 07/24/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: 6.3.0 dmi.board.name: 0YDJK3 dmi.board.vendor: Dell Inc. dmi.board.version: A09 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr6.3.0:bd07/24/2012:svnDellInc.:pnPowerEdgeR710:pvr:rvnDellInc.:rn0YDJK3:rvrA09:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R710 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275809/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp