Public bug reported: A race condition in the Linux kernel randomly causes complete system freezes when the system or a cgroup runs out of memory and the OOM killer is invoked. I ran into this issue twice during the last 2 weeks (Ubuntu 14.04.3 LTS, kernel version 3.13.0-65.106), in my case it was an LXC cgroup running out of memory and not the system itself. The system log files did not show any errors, but there were repeating error messages on the system console (see attached screenshot).
When searching for these error messages I found the following website that provides more information about the cause and a possible solution to fix it: https://community.nitrous.io/posts/stability-and-a-linux-oom- killer-bug I did not see any OOM killer related messages in the system logs at the time the freeze happened, but one of the LXC containers running on that server went out of memory exactly at that time, so I guess this must be related. I was not able to reproduce the error in a testing environment as it seems to be a race condition between several processes that does not occur every time. However, I have applied the 3 suggested commits for mm/oom_kill.c (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?id=4d4048be8a93769350efa31d2482a038b7de73d0&qt=range&q=0c740d0afc3bff0a097ad03a1c8df92757516f5c...4d4048be8a93769350efa31d2482a038b7de73d0) from kernel 3.14 to the current trusty kernel, built the patched kernel and it seems to work. Could this bugfix for the OOM killer be backported to the official trusty kernel? ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-66-generic 3.13.0-66.108 ProcVersionSignature: Ubuntu 3.13.0-66.108-generic 3.13.11-ckt27 Uname: Linux 3.13.0-66-generic x86_64 NonfreeKernelModules: zfs zunicode zcommon znvpair zavl AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Oct 23 09:12 seq crw-rw---- 1 root audio 116, 33 Oct 23 09:12 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3.16 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Mon Oct 26 12:19:55 2015 HibernationDevice: RESUME=UUID=728105e7-2f6b-46fd-bf56-1bf67239adea IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' MachineType: Supermicro H8DGT PciMultimedia: ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-66-generic root=UUID=08db4f0e-59c5-4ffd-a34c-866e3fe126c5 ro nomdmonddf nomdmonisw RelatedPackageVersions: linux-restricted-modules-3.13.0-66-generic N/A linux-backports-modules-3.13.0-66-generic N/A linux-firmware 1.127.15 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/07/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3.0a dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: H8DGT-HF dmi.board.vendor: Supermicro dmi.board.version: 1.21A dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 17 dmi.chassis.vendor: SGI.COM dmi.chassis.version: 1234567890 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd05/07/2013:svnSupermicro:pnH8DGT:pvr1234567890:rvnSupermicro:rnH8DGT-HF:rvr1.21A:cvnSGI.COM:ct17:cvr1234567890: dmi.product.name: H8DGT dmi.product.version: 1234567890 dmi.sys.vendor: Supermicro ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug third-party-packages trusty ** Attachment added: "console error messages" https://bugs.launchpad.net/bugs/1510196/+attachment/4505822/+files/h-0056.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1510196 Title: OOM killer causes complete system freezes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1510196/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
