This bug is awaiting verification that the linux-xilinx- zynqmp/5.4.0-1020.24 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification- done-focal'. If the problem still exists, change the tag 'verification- needed-focal' to 'verification-failed-focal'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-focal-linux-xilinx-zynqmp verification-needed-focal -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-xilinx-zynqmp in Ubuntu. https://bugs.launchpad.net/bugs/1992912 Title: linux-xilinx-zynqmp/focal: main(): sched_setscheduler(): Operation not permitted Status in ubuntu-kernel-tests: New Status in linux-xilinx-zynqmp package in Ubuntu: New Status in linux-xilinx-zynqmp source package in Focal: Fix Committed Bug description: [SRU Justification] [Impact] The focal kernel is failing the ubuntu_ltp:sched:time-schedule01, ubuntu_ltp:sched:trace_sched01 and ubuntu_ltp:irq:irqbalance0 regression test due to sched_setscheduler being unable to a task class to SCHED_FIFO. This is due to have having CONFIG_RT_GROUP_SCHED enabled. Once RT_GROUP_SCHED is enabled it is impossible to schedule realtime tasks for non-root users until you allocate realtime bandwidth for them. There are multiple known issues with CONFIG_RT_GROUP_SCHED that are reported in the debian.master/config/annotations file: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1284731 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1873315 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875665 [Fix] CONFIG_RT_GROUP_SCHED should be disabled. The config was enabled when we copied the Xilinx default config settings and there is not a justification for this exact config. There may even be a negative impact, from the kernel.org documentation: “The default values for sched_rt_period_us (1000000 or 1s) and sched_rt_runtime_us (950000 or 0.95s). This gives 0.05s to be used by SCHED_OTHER (non-RT tasks).” This suggests this option will benefit RT systems, but be detrimental to non-RT systems, [Testcase] The annotations file will enforce that CONFIG_RT_GROUP_SCHED is disabled. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1992912/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
