Public bug reported:
I have seen this a number of times on my servers and it's a real pain.
For reasons unknown, ksmtuned starts running at 100% CPU. I cannot
fathom what would cause this as it appears to be nothing more than a
Bash script. My guess is that there's an infinite loop reached
somewhere, possibly a race condition.
Last line in the log shows nothing suspicious:
Sat Feb 2 14:57:08 GMT 2019: 788230 > 3941152, start ksm
Sat Feb 2 14:57:08 GMT 2019: 184148 < 788230, boost
Sat Feb 2 14:57:08 GMT 2019: KSMCTL start 1250 425
...but that does mean it hasn't done anything useful in over a month.
The script calls some external apps, such as awk, but it appears to be
the script itself that has the issue, i.e. none of the external programs
are running when it hits 100%.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ksmtuned 4.20150325build1
ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
Date: Thu Apr 11 23:08:21 2019
Dependencies:
gcc-8-base 8.2.0-1ubuntu2~18.04
libc6 2.27-3ubuntu1
libgcc1 1:8.2.0-1ubuntu2~18.04
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ksmtuned
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ksmtuned (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1824436
Title:
ksmtuned running at 100%
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