Bug 1900196

$ oc get clusterversions.config.openshift.io
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.7.0-0.nightly-2020-11-24-113830   True        False         75m     Cluster version is 4.7.0-0.nightly-2020-11-24-113830
$ oc project openshift-cluster-node-tuning-operator
Now using project "openshift-cluster-node-tuning-operator" on server "https://api.skordas2411.qe.devcluster.openshift.com:6443".

$ oc get nodes
NAME                                         STATUS   ROLES    AGE    VERSION
ip-10-0-149-21.us-east-2.compute.internal    Ready    master   101m   v1.19.2+13d6aa9
ip-10-0-159-175.us-east-2.compute.internal   Ready    worker   94m    v1.19.2+13d6aa9
ip-10-0-170-112.us-east-2.compute.internal   Ready    master   101m   v1.19.2+13d6aa9
ip-10-0-177-142.us-east-2.compute.internal   Ready    worker   92m    v1.19.2+13d6aa9
ip-10-0-210-52.us-east-2.compute.internal    Ready    master   101m   v1.19.2+13d6aa9
ip-10-0-223-201.us-east-2.compute.internal   Ready    worker   93m    v1.19.2+13d6aa9

$ # Using worker node
$ node=ip-10-0-159-175.us-east-2.compute.internal
$ echo $node
ip-10-0-159-175.us-east-2.compute.internal

$ oc label node $node node-role.kubernetes.io/worker-rt=
node/ip-10-0-159-175.us-east-2.compute.internal labeled

$ oc create -f- <<EOF
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
 name: worker-rt
 labels:
   worker-rt: ""
spec:
 machineConfigSelector:
   matchExpressions:
     - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,worker-rt]}
 nodeSelector:
   matchLabels:
     node-role.kubernetes.io/worker-rt: ""
EOF
machineconfigpool.machineconfiguration.openshift.io/worker-rt created

$ oc create -f- <<EOF
apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
 name: openshift-realtime
 namespace: openshift-cluster-node-tuning-operator
spec:
 profile:
 - data: |
     [main]
     summary=Custom OpenShift realtime profile
     include=openshift-node,realtime
     [variables]
     # isolated_cores take a list of ranges; e.g. isolated_cores=2,4-7
     isolated_cores=1
     #isolate_managed_irq=Y
     not_isolated_cores_expanded=${f:cpulist_invert:${isolated_cores_expanded}}
     [bootloader]
     cmdline_ocp_realtime=+systemd.cpu_affinity=${not_isolated_cores_expanded}
     [service]
     service.stalld=start,enable
   name: openshift-realtime

 recommend:
 - machineConfigLabels:
     machineconfiguration.openshift.io/role: "worker-rt"
   priority: 20
   profile: openshift-realtime
EOF
tuned.tuned.openshift.io/openshift-realtime created

$ oc get nodes
NAME                                         STATUS   ROLES              AGE    VERSION
ip-10-0-149-21.us-east-2.compute.internal    Ready    master             115m   v1.19.2+13d6aa9
ip-10-0-159-175.us-east-2.compute.internal   Ready    worker,worker-rt   107m   v1.19.2+13d6aa9
ip-10-0-170-112.us-east-2.compute.internal   Ready    master             114m   v1.19.2+13d6aa9
ip-10-0-177-142.us-east-2.compute.internal   Ready    worker             106m   v1.19.2+13d6aa9
ip-10-0-210-52.us-east-2.compute.internal    Ready    master             114m   v1.19.2+13d6aa9
ip-10-0-223-201.us-east-2.compute.internal   Ready    worker             106m   v1.19.2+13d6aa9
$ oc get mcp
NAME        CONFIG                                                UPDATED   UPDATING   DEGRADED   MACHINECOUNT   READYMACHINECOUNT   UPDATEDMACHINECOUNT   DEGRADEDMACHINECOUNT   AGE
master      rendered-master-7fc779fc3075d82c9dc6e66f4a7da331      True      False      False      3              3                   3                     0                      114m
worker      rendered-worker-db825c5f533a49125e760e8a24e1be69      True      False      False      2              2                   2                     0                      114m
worker-rt   rendered-worker-rt-ba47b802db57ed1656d6aa35b68f6aee   True      False      False      1              1                   1                     0                      10m

$ oc debug node/$node
Starting pod/ip-10-0-159-175us-east-2computeinternal-debug ...
To use host binaries, run `chroot /host`
Pod IP: 10.0.159.175
If you don't see a command prompt, try pressing enter.
sh-4.4# ps auxww | grep stalld
root        3425  0.5  0.0   8140  2596 ?        Ss   18:37   0:02 /usr/local/bin/stalld -p 1000000000 -r 10000 -d 3 -t 20 --log_syslog --log_kmsg --foreground --pidfile /run/stal
ld.pid
root        8765  0.0  0.0   9184  1080 pts/0    S+   18:46   0:00 grep stalld
sh-4.4# kill 3425
sh-4.4# ps auxww | grep stalld
root       10691  0.7  0.0   7568  2348 ?        Ss   18:49   0:00 /usr/local/bin/stalld -p 1000000000 -r 10000 -d 3 -t 20 --log_syslog --log_kmsg --foreground --pidfile /run/stalld.pid
root       10765  0.0  0.0   9184   976 pts/0    S+   18:49   0:00 grep stalld
sh-4.4# kill 10691
sh-4.4# ps auxww | grep stalld
root       11127  1.0  0.0   7260  2396 ?        Ss   18:50   0:00 /usr/local/bin/stalld -p 1000000000 -r 10000 -d 3 -t 20 --log_syslog --log_kmsg --foreground --pidfile /run/stalld.pid
root       11148  0.0  0.0   9184  1092 pts/0    S+   18:50   0:00 grep stalld
sh-4.4# ps auxww | grep stalld
root       11127  0.7  0.0   7568  2396 ?        Ss   18:50   0:00 /usr/local/bin/stalld -p 1000000000 -r 10000 -d 3 -t 20 --log_syslog --log_kmsg --foreground --pidfile /run/stalld.pid
root       11167  0.0  0.0   9184  1036 pts/0    S+   18:50   0:00 grep stalld
sh-4.4# exit
exit

Removing debug pod ...
$ # ^^ new stalld ID after killing previous ones

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.7.0 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:5633