FS#48172 - [linux-lts] Please turn off CONFIG_RT_GROUP_SCHED in kernel

Attached to Project: Arch Linux
Opened by Segmentation Fault (devnull) - Sunday, 14 February 2016, 07:02 GMT
Last edited by Andreas Radke (AndyRTR) - Tuesday, 16 February 2016, 20:13 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To Andreas Radke (AndyRTR)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description: (from RedHat's bug tracker)

<Lennart Poettering 2015-06-09 09:05:59 EDT>

"I am pretty sure that CONFIG_RT_GROUP_SCHED should be turned off in Fedora, as there's no way to make use of it in a sane way right now. If turned on, and there's any cgroup in the "cpu" hierarchy it needs an RT budget assigned, otherwise the processes in it will not be able to get RT at all. THis then shows up in bugs like 655321."

Additional info:
* package version(s)

pacman -Qi linux
Nombre : linux
Versión : 4.4.1-2
Descripción : The Linux kernel and modules
Arquitectura : x86_64
URL : http://www.kernel.org/
Licencias : GPL2
Grupos : base
Provee : Nada
Depende de : coreutils linux-firmware kmod mkinitcpio>=0.7
Dependencias opcionales : crda: to set the correct wireless channels of your country
Requerido por : catalyst-hook
Opcional para : Nada
En conflicto con : Nada
Remplaza a : Nada
Tamaño de la instalación : 74,52 MiB
Encargado : Evangelos Foutras <evangelos@foutrelis.com>
Fecha de creación : mié 03 feb 2016 14:14:02 CET
Fecha de instalación : dom 07 feb 2016 16:00:07 CET
Motivo de la instalación : Instalado explícitamente
Intérprete de instalación : Sí
Validado por : Firma

* config and/or log files etc.

$ uname -a
Linux watergate 4.1.17-1-lts #1 SMP Mon Feb 1 16:35:08 CET 2016 x86_64 GNU/Linux
Steps to reproduce:

$ dmesg | grep ourselves
[ 276.817643] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 276.862656] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.015901] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.019309] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.025295] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.031823] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.035713] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.511286] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted
[ 277.515374] rtkit-daemon[25688]: Failed to make ourselves RT: Operation not permitted


* Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1229700
This task depends upon

Closed by  Andreas Radke (AndyRTR)
Tuesday, 16 February 2016, 20:13 GMT
Reason for closing:  Fixed
Additional comments about closing:  4.1.18
Comment by Segmentation Fault (devnull) - Sunday, 14 February 2016, 07:04 GMT
Lol I forgot the most important cmd output:

$ zgrep CONFIG_RT_GROUP_SCHED /proc/config.gz
CONFIG_RT_GROUP_SCHED=y
Comment by Tomasz Przybył (FadeMind) - Tuesday, 16 February 2016, 15:17 GMT
BUT it IS disabled already:

https://projects.archlinux.org/svntogit/packages.git/tree/trunk/config.x86_64?h=packages/linux

at 165 line.

BTW:

[tomasz@arch ~]$ zgrep CONFIG_RT_GROUP_SCHED /proc/config.gz
# CONFIG_RT_GROUP_SCHED is not set
[tomasz@arch ~]$


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