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Bug 2168478 - rt-setup overwrites "kernel.hung_task_panic" and "kernel.hung_task_timeout_secs" values even if those values are already set.
Summary: rt-setup overwrites "kernel.hung_task_panic" and "kernel.hung_task_timeout_se...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: rt-setup
Version: CentOS Stream
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.9
Assignee: John Kacur
QA Contact: Shizhao Chen
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-02-09 06:38 UTC by Yoshiaki Senda
Modified: 2023-11-14 15:52 UTC (History)
9 users (show)

Fixed In Version: rt-setup-2.1-5.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-11-14 15:22:33 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-148106 0 None None None 2023-02-09 06:39:10 UTC
Red Hat Product Errata RHBA-2023:6900 0 None None None 2023-11-14 15:22:35 UTC

Internal Links: 2175332

Description Yoshiaki Senda 2023-02-09 06:38:12 UTC 
Description of problem:

The script on post section of rt-setup.spec overwrites "kernel.hung_task_panic" and "kernel.hung_task_timeout_secs" values even if those values are already set.


The script checks /etc/sysctl.conf and if it finds "kernel.hung_task_panic" and "kernel.hung_task_timeout_secs" are already set, it does not set "kernel.hung_task_panic" and "kernel.hung_task_timeout_secs".

But the script doesn't check files under /etc/sysctl.d. If users set "kernel.hung_task_panic" and "kernel.hung_task_timeout_secs" values inside the file under /etc/sysctl.d directory, those values are ignored, and the script overwrite those values.


Version-Release number of selected component (if applicable):

Name: rt-setup
Version: 2.1
Release: 4%{?dist}
License: GPL+
Summary: Setup RHEL-RT environment details
Group: System Environment/Base
Source: rt-setup-%{version}.tar.bz2

How reproducible:

consistent.


Steps to Reproduce:

1. Set "kernel.hung_task_panic" values to 1 inside the file under /etc/sysctl.d directory.
2. Install this package that overwrites "kernel.hung_task_panic" value.


Actual results:

"kernel.hung_task_panic" sets as "0"


Expected results:

"kernel.hung_task_panic" sets as "1"



Additional info:
Comment 1 Yoshiaki Senda 2023-02-09 07:55:37 UTC 
I submitted PR to https://git.centos.org/rpms/rt-setup/pull-request/1 .
Comment 2 Yoshiaki Senda 2023-02-09 15:30:10 UTC 
I submitted MR to https://gitlab.com/redhat/centos-stream/rpms/rt-setup/-/merge_requests/1
Comment 5 Yoshiaki Senda 2023-03-15 22:40:55 UTC 
MR merged to CentOS 8 Stream. https://gitlab.com/redhat/centos-stream/rpms/rt-setup/-/merge_requests/1
Thank you John Kacur for you support.
Comment 6 Shizhao Chen 2023-03-23 03:19:23 UTC 
rt-setup-2.1-5.el8 PASS T0:

https://beaker.engineering.redhat.com/recipes/13599190#tasks


-----

And additionally:

[root@rt-qe-07 rt-setup]# cat /etc/sysctl.d/50-custom.conf
kernel.hung_task_panic = 1
kernel.hung_task_timeout_secs = 999
[root@rt-qe-07 rt-setup]# ls /etc/sysctl.d -l
total 4
-rw-r--r--. 1 root root 63 Mar 22 23:00 50-custom.conf
lrwxrwxrwx. 1 root root 14 Mar 14 05:47 99-sysctl.conf -> ../sysctl.conf

# the sysctl settings are removed manually from /etc/sysctl.conf

[root@rt-qe-07 rt-setup]# grep 'kernel\.' /etc/sysctl.conf ; echo $?
1
[root@rt-qe-07 rt-setup]# rpm -q rt-setup
rt-setup-2.1-4.el8.x86_64
[root@rt-qe-07 rt-setup]# dnf in -y rt-setup-2.1-5.el8.x86_64.rpm --quiet

Upgraded:
  rt-setup-2.1-5.el8.x86_64

[root@rt-qe-07 rt-setup]# grep 'kernel\.' /etc/sysctl.conf ; echo $?
1
[root@rt-qe-07 rt-setup]# dnf downgrade -y --quiet rt-setup

Downgraded:
  rt-setup-2.1-4.el8.x86_64

[root@rt-qe-07 rt-setup]# grep 'kernel\.' /etc/sysctl.conf ; echo $?
kernel.hung_task_panic = 0
# note: this only matters if kernel.hung_task_panic=1
kernel.hung_task_timeout_secs = 600
0


> Marking Tested.
Comment 13 errata-xmlrpc 2023-11-14 15:22:33 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (rt-setup bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6900
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