| 2022-10-14 05:25:39 |
Portia Stephens |
bug |
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added bug |
| 2022-10-14 05:36:04 |
Portia Stephens |
ubuntu-kernel-tests: assignee |
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Portia Stephens (portias) |
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| 2022-10-17 04:22:27 |
Po-Hsu Lin |
bug task added |
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linux-xilinx-zynqmp (Ubuntu) |
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| 2022-10-17 04:23:14 |
Po-Hsu Lin |
tags |
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5.4 focal |
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| 2022-11-01 16:20:10 |
Portia Stephens |
description |
Multiple regression tests are failing on the linux-xilinx-zynqmp/focal kernel when calling sched_setscheduler() or with related operations. This is probably caused by enabling CONFIG_RT_GROUP_SCHED since similiar issues have been seen when enabling this config on other kernels. The following tests are failing with this error:
* ubuntu_ltp:sched:time-schedule01
* ubuntu_ltp:sched:trace_sched01
* ubuntu_qrt_apparmor:test-apparmor |
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 regression test due to sched_setscheduler being unable to a task class to SCHED_FIFO.
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
We do not have a good reason to enable this , I see no processes using realtime scheduling. We should disable this setting to match the upstream Ubuntu focal arm64 kernel. The following tests are failing with this error:
* ubuntu_ltp:sched:time-schedule01
* ubuntu_ltp:sched:trace_sched01
* ubuntu_qrt_apparmor:test-apparmor |
|
| 2022-11-03 13:17:08 |
Portia Stephens |
summary |
linux-xilinx-zynqmp: main(): sched_setscheduler(): Operation not permitted |
linux-xilinx-zynqmp/focal: main(): sched_setscheduler(): Operation not permitted |
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| 2022-11-03 13:41:08 |
Portia Stephens |
description |
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 regression test due to sched_setscheduler being unable to a task class to SCHED_FIFO.
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
We do not have a good reason to enable this , I see no processes using realtime scheduling. We should disable this setting to match the upstream Ubuntu focal arm64 kernel. The following tests are failing with this error:
* ubuntu_ltp:sched:time-schedule01
* ubuntu_ltp:sched:trace_sched01
* ubuntu_qrt_apparmor:test-apparmor |
[SRU Justification]
[Impact]
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 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.
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.
[Testcase] |
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| 2022-11-03 13:48:21 |
Portia Stephens |
description |
[SRU Justification]
[Impact]
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 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.
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.
[Testcase] |
[SRU Justification]
[Impact]
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 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.
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. |
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| 2022-11-03 13:51:34 |
Portia Stephens |
description |
[SRU Justification]
[Impact]
The focal kernel is failing the ubuntu_ltp:sched:time-schedule01 and ubuntu_ltp:sched:trace_sched01 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.
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. |
[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. |
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| 2022-11-03 13:51:45 |
Portia Stephens |
linux-xilinx-zynqmp (Ubuntu): assignee |
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Portia Stephens (portias) |
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| 2022-11-16 04:35:56 |
Portia Stephens |
nominated for series |
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Ubuntu Focal |
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| 2022-11-16 04:35:56 |
Portia Stephens |
bug task added |
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linux-xilinx-zynqmp (Ubuntu Focal) |
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| 2022-11-16 05:24:15 |
Portia Stephens |
linux-xilinx-zynqmp (Ubuntu Focal): status |
New |
Fix Committed |
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| 2022-12-15 13:51:59 |
Ubuntu Kernel Bot |
tags |
5.4 focal |
5.4 focal kernel-spammed-focal-linux-xilinx-zynqmp verification-needed-focal |
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| 2024-05-01 23:24:47 |
Portia Stephens |
linux-xilinx-zynqmp (Ubuntu): status |
New |
Fix Released |
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