>From man 7 udev:
The udev rules are read from the files located in the system rules
directory /lib/udev/rules.d, the volatile runtime directory
/run/udev/rules.d and the local administration directory
/etc/udev/rules.d. All rules files are collectively sorted and processed
in lexical order, regardless of the directories in which they live.
However, files with identical filenames replace each other. Files in
/etc have the highest priority, files in /run take precedence over files
with the same name in /lib. This can be used to override a system-
supplied rules file with a local file if needed; a symlink in /etc with
the same name as a rules file in /lib, pointing to /dev/null, disables
the rules file entirely. Rule files must have the extension .rules;
other extensions are ignored.
As such, the best way to work around this is:
sudo ln -s /dev/null /etc/udev/rules.d/40-vm-hotadd.rules
Unlike deleting or modifying the original file, this will persist across
upgrades without requiring manual conflict resolution.
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
kswapd0 100% CPU usage
Status in Linux:
Status in linux package in Ubuntu:
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. 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.
 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
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
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'
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:
Date: Fri Nov 20 20:44:30 2015
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize
MachineType: Xen HVM domU
PATH=(custom, no user)
ProcFB: 0 xen
root=UUID=35bc01f4-4602-4823-976e-508edef899df ro console=tty1 console=ttyS0
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.product.name: HVM domU
To manage notifications about this bug go to:
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