After installing a SNO node with 4.12.54 with Telco DU profile applied and running our cpu utlization tests, the  node becomes unresponsive and times out for a very log time (both oc commands and ssh access).

The workload test starts a couple of oslat pods and a number of stress-ng pods for the workload using a portion of the isolated cpus on the BM.

I was only able to collect logs, must-gather, etc. after leaving the node overnight with the workload pods still running . Then oc/ssh commands because responsive again and I was able to collect debugs and logs.

I will attach must-gather, sosreport, etc. in a comment. Please let me know if there are any other logs of interest that I should capture.

Symptoms are similar to OCPBUGS-30096

This issue seems to be specific to systems running with an Ice Lake processor. SPR-EE doesn't seem to have this problem

    

    OCP Version at Install Time: 4.12.54
    RHCOS Version at Install Time: 

$ cat /etc/redhat-release 
Red Hat Enterprise Linux CoreOS release 4.12
Platform Baremetal: Dell PowerEdge R750

$ uname -r
4.18.0-372.98.1.rt7.258.el8_6.x86_64

$ lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              112
On-line CPU(s) list: 0-111
Thread(s) per core:  2
Core(s) per socket:  28
Socket(s):           2
NUMA node(s):        2
Vendor ID:           GenuineIntel
CPU family:          6
Model:               106
Model name:          Intel(R) Xeon(R) Gold 6330N CPU @ 2.20GHz
Stepping:            6
CPU MHz:             2200.000
BogoMIPS:            4400.00
Virtualization:      VT-x
L1d cache:           48K
L1i cache:           32K
L2 cache:            1280K
L3 cache:            43008K
NUMA node0 CPU(s):   0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,102,104,106,108,110
NUMA node1 CPU(s):   1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,97,99,101,103,105,107,109,111
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 invpcid_single ssbd mba ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local split_lock_detect wbnoinvd dtherm ida arat pln pts avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg tme avx512_vpopcntdq la57 rdpid fsrm md_clear pconfig flush_l1d arch_capabilities
    

    Always.
    

    1. Install SNO node with Telco DU profile applied.
    2. Run RAN QE cpu_util=1h tests
    3. Observe test results
    

test starts workload but then node because unresponsive and times out all commands os the test suite fails.
    

Test should start workload and run successfully
    

    pod list. Ignore installer pods.

$ oc get pods -A 
NAMESPACE                                          NAME                                                              READY   STATUS      RESTARTS        AGE
assisted-installer                                 assisted-installer-controller-b6hwd                               0/1     Completed   0               3d17h
cnfgotestpriv                                      cnfgotestpriv-helix54.lab.eng.rdu2.redhat.com                     1/1     Running     0               23h
open-cluster-management-agent-addon                config-policy-controller-5585595995-dx8zb                         2/2     Running     5 (10h ago)     3d17h
open-cluster-management-agent-addon                governance-policy-framework-7c7cc97bd9-rdnr9                      2/2     Running     9 (10h ago)     3d17h
open-cluster-management-agent-addon                klusterlet-addon-workmgr-58cd697bf7-8gszm                         1/1     Running     1               3d17h
open-cluster-management-agent                      klusterlet-568fdc4c67-6b5zg                                       1/1     Running     1               3d17h
open-cluster-management-agent                      klusterlet-agent-7dc4df9b4c-5p287                                 1/1     Running     1               3d17h
openshift-apiserver-operator                       openshift-apiserver-operator-7c45658f79-c59kb                     1/1     Running     8 (10h ago)     3d17h
openshift-apiserver                                apiserver-85dd9d5cd9-tdxnb                                        2/2     Running     0               3d16h
openshift-authentication-operator                  authentication-operator-7b4ccd6d4b-whpvh                          1/1     Running     11 (10h ago)    3d17h
openshift-authentication                           oauth-openshift-6744ff7599-8r4gq                                  1/1     Running     0               3d15h
openshift-cloud-controller-manager-operator        cluster-cloud-controller-manager-operator-5c9cb8b9dd-nz26t        2/2     Running     6 (22h ago)     3d17h
openshift-cloud-credential-operator                cloud-credential-operator-b965dfbf4-8nthf                         2/2     Running     3 (23h ago)     3d17h
openshift-cluster-machine-approver                 machine-approver-cf9c8f66-bgqsg                                   2/2     Running     10 (10h ago)    3d17h
openshift-cluster-node-tuning-operator             cluster-node-tuning-operator-78dd9b5bd8-cl57w                     1/1     Running     4 (22h ago)     3d17h
openshift-cluster-node-tuning-operator             tuned-gflmd                                                       1/1     Running     1               3d17h
openshift-cluster-samples-operator                 cluster-samples-operator-66cd94ff9c-wpbrz                         2/2     Running     2               3d17h
openshift-cluster-storage-operator                 cluster-storage-operator-8499666589-96qss                         1/1     Running     9 (10h ago)     3d17h
openshift-cluster-storage-operator                 csi-snapshot-controller-5db5859857-g7wxx                          1/1     Running     8 (10h ago)     3d17h
openshift-cluster-storage-operator                 csi-snapshot-controller-operator-7cd774c84b-bnfj2                 1/1     Running     8 (10h ago)     3d17h
openshift-cluster-storage-operator                 csi-snapshot-webhook-7bb787f596-xfmjx                             1/1     Running     1               3d17h
openshift-cluster-version                          cluster-version-operator-56799c8976-9zk78                         1/1     Running     6 (10h ago)     3d17h
openshift-config-operator                          openshift-config-operator-9f8dd6978-9lltf                         1/1     Running     7 (22h ago)     3d17h
openshift-console-operator                         console-operator-55dbd86564-7h44r                                 2/2     Running     13 (10h ago)    3d17h
openshift-controller-manager-operator              openshift-controller-manager-operator-664bcdfbbc-w5hwg            1/1     Running     5 (10h ago)     3d17h
openshift-controller-manager                       controller-manager-75d5dd8cd4-b2npn                               1/1     Running     2 (22h ago)     2d18h
openshift-dns-operator                             dns-operator-7f86f6f997-gfl7g                                     2/2     Running     2               3d17h
openshift-dns                                      dns-default-492ck                                                 2/2     Running     2               3d17h
openshift-dns                                      node-resolver-vjj6g                                               1/1     Running     1               3d17h
openshift-etcd-operator                            etcd-operator-ccd6ccf9-b6cxn                                      1/1     Running     5 (10h ago)     3d17h
openshift-etcd                                     etcd-helix54.lab.eng.rdu2.redhat.com                              4/4     Running     5 (23h ago)     3d17h
openshift-etcd                                     installer-2-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-etcd                                     installer-3-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-image-registry                           cluster-image-registry-operator-7f4d548656-hlvw7                  1/1     Running     3 (22h ago)     3d17h
openshift-image-registry                           image-pruner-28529280-ddw6q                                       0/1     Completed   0               3d15h
openshift-image-registry                           image-pruner-28530720-vtfg4                                       0/1     Completed   0               2d15h
openshift-image-registry                           image-pruner-28532160-rxccq                                       0/1     Completed   0               39h
openshift-image-registry                           node-ca-x9l7n                                                     1/1     Running     1               3d17h
openshift-ingress-canary                           ingress-canary-k7lw7                                              1/1     Running     1               3d17h
openshift-ingress-operator                         ingress-operator-688565ff4c-wghc9                                 2/2     Running     8 (3d17h ago)   3d17h
openshift-ingress                                  router-default-7fdd957b77-854tl                                   1/1     Running     13 (22h ago)    3d17h
openshift-insights                                 insights-operator-85bd6b9d75-dbhlr                                1/1     Running     2               3d17h
openshift-kube-apiserver-operator                  kube-apiserver-operator-db9d8b854-5cnhx                           1/1     Running     8 (10h ago)     3d17h
openshift-kube-apiserver                           installer-10-helix54.lab.eng.rdu2.redhat.com                      0/1     Completed   0               2d18h
openshift-kube-apiserver                           installer-2-helix54.lab.eng.rdu2.redhat.com                       0/1     Error       0               3d17h
openshift-kube-apiserver                           installer-3-helix54.lab.eng.rdu2.redhat.com                       0/1     Error       0               3d17h
openshift-kube-apiserver                           installer-3-retry-1-helix54.lab.eng.rdu2.redhat.com               0/1     Completed   0               3d17h
openshift-kube-apiserver                           installer-4-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-kube-apiserver                           installer-5-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-kube-apiserver                           installer-6-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               2d23h
openshift-kube-apiserver                           installer-7-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               2d22h
openshift-kube-apiserver                           installer-8-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               2d22h
openshift-kube-apiserver                           installer-9-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               2d19h
openshift-kube-apiserver                           kube-apiserver-helix54.lab.eng.rdu2.redhat.com                    5/5     Running     4 (22h ago)     2d18h
openshift-kube-controller-manager-operator         kube-controller-manager-operator-6ffc759b87-lwfsk                 1/1     Running     8 (10h ago)     3d17h
openshift-kube-controller-manager                  installer-4-helix54.lab.eng.rdu2.redhat.com                       0/1     Error       0               3d17h
openshift-kube-controller-manager                  installer-4-retry-1-helix54.lab.eng.rdu2.redhat.com               0/1     Error       0               3d17h
openshift-kube-controller-manager                  installer-4-retry-2-helix54.lab.eng.rdu2.redhat.com               0/1     Completed   0               3d17h
openshift-kube-controller-manager                  installer-5-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-kube-controller-manager                  installer-6-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-kube-controller-manager                  kube-controller-manager-helix54.lab.eng.rdu2.redhat.com           4/4     Running     29 (10h ago)    3d17h
openshift-kube-scheduler-operator                  openshift-kube-scheduler-operator-6fcd67464b-ss2rb                1/1     Running     4 (22h ago)     3d17h
openshift-kube-scheduler                           installer-6-helix54.lab.eng.rdu2.redhat.com                       0/1     Error       0               3d17h
openshift-kube-scheduler                           installer-6-retry-1-helix54.lab.eng.rdu2.redhat.com               0/1     Error       0               3d17h
openshift-kube-scheduler                           installer-6-retry-2-helix54.lab.eng.rdu2.redhat.com               0/1     Error       0               3d17h
openshift-kube-scheduler                           installer-8-helix54.lab.eng.rdu2.redhat.com                       0/1     Completed   0               3d17h
openshift-kube-scheduler                           openshift-kube-scheduler-helix54.lab.eng.rdu2.redhat.com          3/3     Running     8 (22h ago)     3d17h
openshift-kube-scheduler                           revision-pruner-6-helix54.lab.eng.rdu2.redhat.com                 0/1     Completed   0               3d17h
openshift-kube-scheduler                           revision-pruner-7-helix54.lab.eng.rdu2.redhat.com                 0/1     Completed   0               3d17h
openshift-kube-scheduler                           revision-pruner-8-helix54.lab.eng.rdu2.redhat.com                 0/1     Completed   0               3d17h
openshift-kube-storage-version-migrator-operator   kube-storage-version-migrator-operator-696f5b4cd6-qb6d8           1/1     Running     5 (10h ago)     3d17h
openshift-kube-storage-version-migrator            migrator-6cd55974d-bjr5f                                          1/1     Running     1               3d17h
openshift-local-storage                            local-storage-operator-b77d48486-48p6n                            1/1     Running     6 (22h ago)     3d17h
openshift-logging                                  cluster-logging-operator-5d6fd786b7-ns4l2                         1/1     Running     1               3d17h
openshift-logging                                  collector-sg7n9                                                   1/1     Running     7 (22h ago)     3d17h
openshift-machine-api                              cluster-autoscaler-operator-7b56cd79c-n2h5n                       2/2     Running     8 (10h ago)     3d17h
openshift-machine-api                              cluster-baremetal-operator-857f8d49bb-xbg8d                       2/2     Running     2               3d17h
openshift-machine-api                              control-plane-machine-set-operator-7bf8bcb697-t49jl               1/1     Running     2 (23h ago)     3d17h
openshift-machine-api                              machine-api-operator-5486d647f4-47x28                             2/2     Running     4 (22h ago)     3d17h
openshift-machine-config-operator                  machine-config-controller-74b59b444f-2x2vf                        2/2     Running     4 (22h ago)     3d17h
openshift-machine-config-operator                  machine-config-daemon-sps7z                                       2/2     Running     2               3d17h
openshift-machine-config-operator                  machine-config-operator-5686796db8-d4dtb                          1/1     Running     3 (22h ago)     3d17h
openshift-machine-config-operator                  machine-config-server-57kz4                                       1/1     Running     1               3d17h
openshift-marketplace                              621c0e1d7f8078b3bee1cc563a6f1f15b74a1cf1881c75bc5224b0669194pkb   0/1     Completed   0               3d17h
openshift-marketplace                              92dd0af2b8de68c8bc8590413242dc0d5ae3d2644a4a89c974ce876197prmxh   0/1     Completed   0               3d17h
openshift-marketplace                              a16a3cc0b92b93eb191ec6e64d8e873251ccaaab775e0dbe4bd3fa316antn7q   0/1     Completed   0               3d17h
openshift-marketplace                              ca4446e0495d302207c932e410bce8fcff613d5e76c15bc2e106278ff4prnhp   0/1     Completed   0               3d17h
openshift-marketplace                              certified-operators-custom-hg89v                                  1/1     Running     4 (22h ago)     3d17h
openshift-marketplace                              d9906a460566ac6f16a2bde80af6a855ec4879fe3a49cfbaf9d997e02awk5pq   0/1     Completed   0               3d17h
openshift-marketplace                              marketplace-operator-6d958c7db5-dg4bh                             1/1     Running     13 (10h ago)    3d17h
openshift-marketplace                              redhat-operators-custom-8k7r8                                     1/1     Running     4 (22h ago)     3d17h
openshift-monitoring                               cluster-monitoring-operator-6c5d6757c-ntnft                       2/2     Running     2               3d17h
openshift-monitoring                               kube-state-metrics-57568d4d44-w4qg7                               3/3     Running     3               3d17h
openshift-monitoring                               node-exporter-qfpj7                                               2/2     Running     2               3d17h
openshift-monitoring                               openshift-state-metrics-779888777d-59npk                          3/3     Running     3               3d17h
openshift-monitoring                               process-exporter-mt8w4                                            1/1     Running     0               23h
openshift-monitoring                               prometheus-adapter-c8bdb89bf-jzrbz                                1/1     Running     0               2d17h
openshift-monitoring                               prometheus-k8s-0                                                  6/6     Running     8 (22h ago)     3d17h
openshift-monitoring                               prometheus-operator-9655df9d4-8qxlk                               2/2     Running     2               3d17h
openshift-monitoring                               prometheus-operator-admission-webhook-646d865769-dr955            1/1     Running     1               3d17h
openshift-monitoring                               thanos-querier-5b79c9dc95-zttbj                                   6/6     Running     6               3d17h
openshift-multus                                   multus-additional-cni-plugins-6z6fg                               1/1     Running     1               3d17h
openshift-multus                                   multus-admission-controller-7bcf5b4ccc-4k2gr                      2/2     Running     0               3d17h
openshift-multus                                   multus-xr455                                                      1/1     Running     1               3d17h
openshift-multus                                   network-metrics-daemon-x7x6z                                      2/2     Running     2               3d17h
openshift-network-operator                         network-operator-7d88cb796b-dxvz9                                 1/1     Running     5 (10h ago)     3d17h
openshift-oauth-apiserver                          apiserver-5c55b9d6b6-d9fhl                                        1/1     Running     3 (22h ago)     3d17h
openshift-operator-lifecycle-manager               catalog-operator-659b567fbc-8gg6v                                 1/1     Running     1               3d17h
openshift-operator-lifecycle-manager               collect-profiles-28534500-lns57                                   0/1     Completed   0               44m
openshift-operator-lifecycle-manager               collect-profiles-28534515-nrsht                                   0/1     Completed   0               29m
openshift-operator-lifecycle-manager               collect-profiles-28534530-ts9p7                                   0/1     Completed   0               14m
openshift-operator-lifecycle-manager               olm-operator-595c6c9b88-twztv                                     1/1     Running     1               3d17h
openshift-operator-lifecycle-manager               package-server-manager-84c5c69748-m882t                           1/1     Running     3 (22h ago)     3d17h
openshift-operator-lifecycle-manager               packageserver-86dfb5c79d-tng78                                    1/1     Running     1               3d17h
openshift-ovn-kubernetes                           ovnkube-master-ltrlp                                              6/6     Running     8 (22h ago)     3d17h
openshift-ovn-kubernetes                           ovnkube-node-s6q5n                                                5/5     Running     5               3d17h
openshift-ptp                                      linuxptp-daemon-t7x52                                             2/2     Running     2               3d17h
openshift-ptp                                      ptp-operator-795878776c-56cmr                                     1/1     Running     2 (23h ago)     3d17h
openshift-route-controller-manager                 route-controller-manager-9646cb6b8-cswkt                          1/1     Running     2 (22h ago)     2d18h
openshift-service-ca-operator                      service-ca-operator-54896f9bd8-j25dw                              1/1     Running     5 (10h ago)     3d17h
openshift-service-ca                               service-ca-79864d7b86-x4mv6                                       1/1     Running     7 (10h ago)     3d17h
openshift-sriov-network-operator                   network-resources-injector-tnwjl                                  1/1     Running     1               3d17h
openshift-sriov-network-operator                   operator-webhook-7fp7j                                            1/1     Running     1               3d17h
openshift-sriov-network-operator                   sriov-device-plugin-6kjh8                                         1/1     Running     0               3d16h
openshift-sriov-network-operator                   sriov-network-config-daemon-hvn9l                                 3/3     Running     3               3d17h
openshift-sriov-network-operator                   sriov-network-operator-784796b954-cvrjw                           1/1     Running     3 (22h ago)     3d17h
ran-test                                           oslat-m5d5b                                                       1/1     Running     0               23h
ran-test                                           oslat-nj2mx                                                       1/1     Running     0               23h
ran-test                                           stress-ng-2c5dr                                                   1/1     Running     1               23h
ran-test                                           stress-ng-2vnp7                                                   1/1     Running     0               23h
ran-test                                           stress-ng-4hzkp                                                   1/1     Running     0               23h
ran-test                                           stress-ng-4mrtv                                                   1/1     Running     0               23h
ran-test                                           stress-ng-5594d                                                   1/1     Running     3               23h
ran-test                                           stress-ng-5lq4s                                                   1/1     Running     0               23h
ran-test                                           stress-ng-6dn4c                                                   1/1     Running     0               23h
ran-test                                           stress-ng-6wph9                                                   1/1     Running     0               23h
ran-test                                           stress-ng-6xvdv                                                   1/1     Running     0               23h
ran-test                                           stress-ng-7qz5l                                                   1/1     Running     0               23h
ran-test                                           stress-ng-7zswm                                                   1/1     Running     1               23h
ran-test                                           stress-ng-8m8zv                                                   1/1     Running     0               23h
ran-test                                           stress-ng-cm7xj                                                   1/1     Running     0               23h
ran-test                                           stress-ng-gqf8s                                                   1/1     Running     1               23h
ran-test                                           stress-ng-jc5q2                                                   1/1     Running     0               23h
ran-test                                           stress-ng-jhhlx                                                   1/1     Running     0               23h
ran-test                                           stress-ng-jlrrp                                                   1/1     Running     0               23h
ran-test                                           stress-ng-jm28n                                                   1/1     Running     4               23h
ran-test                                           stress-ng-lmmx5                                                   1/1     Running     4               23h
ran-test                                           stress-ng-lzn4n                                                   1/1     Running     0               23h
ran-test                                           stress-ng-ndksx                                                   1/1     Running     0               23h
ran-test                                           stress-ng-nw4wl                                                   1/1     Running     0               23h
ran-test                                           stress-ng-nzp46                                                   1/1     Running     1               23h
ran-test                                           stress-ng-s4wc2                                                   1/1     Running     0               23h
ran-test                                           stress-ng-s87f6                                                   1/1     Running     0               23h
ran-test                                           stress-ng-vb7pc                                                   1/1     Running     0               23h
ran-test                                           stress-ng-wbxpb                                                   1/1     Running     0               23h
ran-test                                           stress-ng-wnrt4                                                   1/1     Running     0               23h
vran-acceleration-operators                        accelerator-discovery-vvwhg                                       1/1     Running     1               3d17h
vran-acceleration-operators                        sriov-device-plugin-9kf6c                                         1/1     Running     1               3d17h
vran-acceleration-operators                        sriov-fec-controller-manager-64f8898c7c-6brz4                     2/2     Running     6 (22h ago)     3d17h
vran-acceleration-operators                        sriov-fec-daemonset-fczmx                                         1/1     Running     1               3d17h