FS#43184 - [linux] 4.2.x Real time priority broken with systemd 218

Attached to Project: Arch Linux
Opened by Adriano Moura (MaMuS) - Sunday, 21 December 2014, 18:15 GMT
Last edited by Tobias Powalowski (tpowa) - Thursday, 03 September 2015, 13:07 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To Tobias Powalowski (tpowa)
Thomas Bächler (brain0)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
No process or user (including root) can elevate a process from standard scheduling to real time scheduling (fifo)

Additional info:
fully updated system with systemd 218


Steps to reproduce:
Look for this rtkit-daemon log output, when it starts:
rtkit-daemon[10832]: Successfully called chroot.
rtkit-daemon[10832]: Successfully dropped privileges.
rtkit-daemon[10832]: Successfully limited resources.
rtkit-daemon[10832]: Running.
rtkit-daemon[10832]: Canary thread running.
rtkit-daemon[10832]: Failed to make ourselves RT: Operation not permitted
rtkit-daemon[10832]: Watchdog thread running.

downgrade to systemd 217 (lib32-systemd libsystemd systemd systemd-sysvcompat)
notice that rtkit-daemon does not outputs "Failed to make ourselves RT: Operation not permitted" anymore.
This task depends upon

Closed by  Tobias Powalowski (tpowa)
Thursday, 03 September 2015, 13:07 GMT
Reason for closing:  Fixed
Additional comments about closing:  4.2.0-1
Comment by Dave Reisner (falconindy) - Sunday, 21 December 2014, 19:08 GMT
Please report such things upstream. This isn't a packaging problem.
Comment by Adriano Moura (MaMuS) - Monday, 22 December 2014, 00:03 GMT
Done, reported it here:
https://bugs.freedesktop.org/show_bug.cgi?id=87570
Comment by Heinrich Siebmanns (Harvey) - Friday, 10 July 2015, 13:25 GMT
  • Field changed: Percent Complete (100% → 0%)
Seen this today on an Acer V3 771G with archlinux x86-64 and systemd 222 while upstream says it can be fixed by turning off CONFIG_RT_GROUP_SCHED (see https://bugzilla.redhat.com/show_bug.cgi?id=1229700)
Comment by Dave Reisner (falconindy) - Friday, 10 July 2015, 13:40 GMT
If you want CONFIG_RT_GROUP_SCHED disabled, then file a bug against the linux package requesting that. Not sure why this bug was reopened if it "can't" be fixed in systemd...
Comment by Heinrich Siebmanns (Harvey) - Saturday, 11 July 2015, 10:39 GMT
I am sorry to say that I don't know what you are trying to explain to me. Forgive the ignorant question of a user: what package? Kernel (hence linux-package?) and if so, what arch? FWIW, from the link I provided you can see that at least Fedora follows the hint for rawhide. Again, sorry, but am confused what to do.

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