This is still the case in Ubuntu 15.10. It would really be cool if this could be fixed, because it causes data loss and regularly interrupts my work. I cannot imagine this same software runs on servers, IoT and systems that need reliability.
-- 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/1476211 Title: kswapd takes 100% CPU although there is no swap Status in linux package in Ubuntu: Confirmed Bug description: On a notebook with neither swap partition nor swap file (because of SSD and surplus of RAM), kswapd0 suddenly runs amok and takes 100% of CPU activity. When this happens, usually at most 5.5 of 8 GB RAM were in use, so there is no reason to swap. This happens so suddenly, that no user input is possible anymore, eg. I can barely switch to tty to kill processes that take most RAM. The processor becomes extremely hot and I can only turn the computer off and reboot. I consider this as critical and harmful to my hardware. I noticed that Ubuntu installs by default with swappiness 60. Now I changed that to 10 because I would never encounter the case that 8GB are in use, but it didn't have an effect. Expected behavior: - on systems without RAM, kswapd should never attempt to swap - if there is not enough RAM, kernel should kill processes to free up RAM - no process should be able to claim so much CPU activity, that the computer becomes unresponsive (it should always be possible to control/stop/kill processes over tty) Actual behavior: - kswapd tries to swap although there is no swap space ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-22-generic 3.19.0-22.22 ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1 Uname: Linux 3.19.0-22-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: andreas 2368 F.... pulseaudio /dev/snd/controlC0: andreas 2368 F.... pulseaudio CurrentDesktop: Unity Date: Mon Jul 20 12:49:24 2015 EcryptfsInUse: Yes InstallationDate: Installed on 2015-06-06 (43 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: LENOVO 20266 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-22-generic root=UUID=8a0dc2f3-fcf3-4e5b-8e23-1441bd36e3dc ro noprompt persistent quiet splash acpi_backlight=vendor vt.handoff=7 init=/sbin/upstart RelatedPackageVersions: linux-restricted-modules-3.19.0-22-generic N/A linux-backports-modules-3.19.0-22-generic N/A linux-firmware 1.143.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/31/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 76CN31WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Yoga2 dmi.board.vendor: LENOVO dmi.board.version: 31900058STD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Yoga 2 Pro dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro: dmi.product.name: 20266 dmi.product.version: Lenovo Yoga 2 Pro dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1476211/+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
