8 months on and one of my systems is exhibiting what would appear to be
the same bug... it was running Ubuntu 17.04 happily and just got
upgraded to 17.10 with today's updates. (Yeah... upgrade, not
reinstall... not enough time to re-download all the Insync files!)
These were the first lines of `top` as the computer started going into
slowdown:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
54 root 20 0 0 0 0 R 47.2 0.0 2:46.26 kswapd0
1678 tracey 20 0 3917924 139976 4 D 1.2 3.6 1:01.26 insync
kswapd0 went higher then it locked up.
I have a small swapfile, although the system is running on an SSD.
root@tracey-nnnn:~# swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 2G 498.5M -1
I have vm.swappiness=1 in /etc/sysctl.conf
This is memory when the system is running normally:
root@tracey-nnnn:~# free -h
total used free shared buff/cache available
Mem: 3.7G 2.2G 339M 998M 1.2G 392M
Swap: 2.0G 498M 1.5G
Suggestions please?
Frustrated of Lyme Regis
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in Linux:
Unknown
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Yakkety:
Fix Released
Bug description:
As per bug 721896 and various others:
I'm on an AWS t2.micro instance (Xeon E5-2670, 991MiB of memory).
Occasionally (about once a day), kswapd0 falls into a busy loop and
spins on 100% CPU usage indefinitely. This can be provoked by
copying/writing large files (e.g. dding a 256MB file), but it happens
occasionally otherwise. System memory usage (not including
buffers/caches) currently sits at 36%, which is typical[1]. Initially
I had no swap space configured; I've since tried enabling a 256MB swap
file, but the problem continues to occur and no swap space is used.
The system can be recovered with `echo 1 > /proc/sys/vm/drop_caches`.
Happy to provide further information/take further debugging actions.
[1] Full output from `free`:
total used free shared buffers cached
Mem: 1014936 483448 531488 28556 9756 112700
-/+ buffers/cache: 360992 653944
Swap: 262140 0 262140
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-18-generic 4.2.0-18.22
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Nov 19 19:40 seq
crw-rw---- 1 root audio 116, 33 Nov 19 19:40 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.19.1-0ubuntu5
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: N/A
Date: Fri Nov 20 20:44:30 2015
Ec2AMI: ami-1c552a76
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1d
Ec2InstanceType: t2.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize
libusb: -99
MachineType: Xen HVM domU
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 xen
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic
root=UUID=35bc01f4-4602-4823-976e-508edef899df ro console=tty1 console=ttyS0
net.ifnames=0
RelatedPackageVersions:
linux-restricted-modules-4.2.0-18-generic N/A
linux-backports-modules-4.2.0-18-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/06/2015
dmi.bios.vendor: Xen
dmi.bios.version: 4.2.amazon
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias:
dmi:bvnXen:bvr4.2.amazon:bd05/06/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.2.amazon
dmi.sys.vendor: Xen
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