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Bug
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Resolution: Done-Errata
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Undefined
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rhel-9.4, rhel-9.4.z
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None
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tuned-2.25.1-1.el9
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No
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Important
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Patch, Upstream
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rhel-sst-cs-net-perf-services
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rhel-sst-cs-net-perf-services
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ssg_core_services
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26
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8
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False
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None
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None
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None
What were you trying to do that didn't work?
Run add/remove block devices while TuneD is running. Restart TuneD. There is a rare race where the TUNED_BOOT_CMDLINE will be garbled in /etc/tuned/bootcmdline when we hit the race.
What is the impact of this issue to you?
Failure to set kernel parameters on the entire OCP cluster, because the TuneD agents running on the nodes do not agree on kernel parameters.
Please provide the package NVR for which the bug is seen:
tuned-2.24.0-2.1.20240819gitc082797f.el9fdp.noarch.rpm
How reproducible is this bug?
Rare, but we have a reproducer script which seems to reproduce the issue relatively reliably.
Steps to reproduce
devices=100
create_block_devices() {
for d in $(seq 1 $devices)
do
dmsetup create dummy$d --table '0 4092 zero'
sleep 0.001s
done
}
delete_block_devices() {
for d in $(seq 1 $devices)
do
dmsetup remove dummy$d 2>/dev/null
done
}
delete_block_devices
for i in $(seq 1 100)
do
create_block_devices &
timeout 4 /usr/sbin/tuned --no-dbus --log tuned$i.log &
pid=$!
wait $pid
grep ^TUNED_BOOT_CMDLINE /etc/tuned/bootcmdline | tee -a bootcmdline.log
delete_block_devices
sed -i 's/TUNED_BOOT_CMDLINE=.*$/TUNED_BOOT_CMDLINE=""/' /etc/tuned/bootcmdline
done
TuneD profile
[main]
include=throughput-performance
[bootloader]
cmdline_pstate=intel_pstate=${f:intel_recommended_pstate}
Expected results
No race and consistently correct value of TUNED_BOOT_CMDLINE in /etc/tuned/bootcmdline.
Actual results
TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE=">4096disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable" TUNED_BOOT_CMDLINE="intel_pstate=disable"
Additional context
- is depended on by
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- Verified
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- links to
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RHSA-2025:144994
tuned security update
