[[Ubuntu does not provide an update path for (these) Lenovo BIOS. Maybe
it would be nice to have a solution for this as well, to avoid users
being bound to buggy and outdated BIOS. To add, the given instructions
to the wiki seem very abandonned and do not (not all) apply to nowadays
ROMs of >10MB. Figuring that out cost me a day. ]]
After installing the Win8/BIOS, the problem still occurs.
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
76CN43WW
03/30/2015
When I intentionally launch so many applications to trigger the freezes, I
noticed that `top` displays actually different numbers:
KiB Mem: 8085948 total, 8023384 used, 62564 free, 3564 buffers
KiB Swap: 0 total, 0 used, 0 free. 2976336 cached Mem
The before mentioned numbers were from Gnome system monitor (oh!), which always
displays only 5GB / 65% of RAM. This time had also top opened before the freeze.
Do I interprete it right that under these conditions the memory is indeed full
and that system monitor displays (used‒cached) ?
The laptop was still frozen about 10min until the Kernel decided (or was
able to) kill processes and became repsonsive again. On a second test,
it didn't become responsive even after 20min.
So concluding,
• there could be a bug in system monitor to display (used ‒ cached) RAM
• I still don't know what it is doing within these 10 – ∞ minutes. I still
think the Kernel should be able to start killing processes (earlier), or there
should be warnings that can take effect before the computer becomes
unresponsive.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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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
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