https://bugzilla.kernel.org/show_bug.cgi?id=205861
Bug ID: 205861
Summary: Semi-regularly, 1 CPU core is entirely hogged by
kworker/0:1+kacpid
Product: ACPI
Version: 2.5
Kernel Version: 5.3.9 (Debian)
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: acpi_ot...@kernel-bugs.osdl.org
Reporter: post+ker...@ralfj.de
Regression: No
Since the kernel update from 4.19.37-6 to 5.2.17-1 (Debian kernel version), I
regularly have 100% load on one CPU core. "htop" shows a red bar for that load,
which means it is "kernel" load. According to "top", the load is caused by
"kworker/0:1+kacpid". "perf top" in one case showed some function names
involving acpi, but when this just happened again, "perf top" showed no
noticeable load at all.
The issue persists with the kernel I have currently installed:
$ uname -a
Linux r-thinktop 5.3.0-2-amd64 #1 SMP Debian 5.3.9-3 (2019-11-19) x86_64
GNU/Linux
This happens roughly once or twice a day.
It starts randomly during operation, at least I have not been able to find a
pattern yet.
To get rid of this, I have to put the machine to suspend and resume it again.
I am using Debian testing on a ThinkPad P50.
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