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Type: Bug
Resolution: Unresolved
Priority: Minor
Fix Version/s: None
Affects Version/s: 4.20.z
Component/s: Multi-Arch / IBM P and Z
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s390x

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Authentication operator is failing for few hours post cluster install.

I can see authentication operator is having some problem with healthz api because of which operator Available status is flapping from True to False. which is causing oc login failure

we are observing this on few of ours servers from 4.20.0-ec.6 build and observed on 4.20.0-rc.0 & 4.20.0-rc.1.

I am suspecting this PR is causing this issue https://s390x.ocp.releases.ci.openshift.org/releasestream/4-dev-preview-s390x/release/4.20.0-ec.6
AUTH-543: OIDC/OAuth resource configuration #740
https://github.com/openshift/cluster-authentication-operator/pull/740

Steps to reproduce:-
Install ocp cluster on IBM Z .

Observation:-
I tried to check auth operator in a loop and i could see this Available True to False and False to True with a minute.

Mon Sep 15 04:28:24 AM EDT 2025
authentication                             4.20.0-rc.1   True        False         False      0s      
NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:27 AM EDT 2025
authentication                             4.20.0-rc.1   True        False         False      1s      

NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:29 AM EDT 2025
authentication                             4.20.0-rc.1   True        False         False      0s      
 
NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:31 AM EDT 2025

authentication                             4.20.0-rc.1   False       False         False      0s      OAuthServerRouteEndpointAccessibleControllerAvailable: Get "https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz": EOF

NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:34 AM EDT 2025

authentication                             4.20.0-rc.1   False       False         False      1s      OAuthServerRouteEndpointAccessibleControllerAvailable: Get "https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz": EOF

NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:36 AM EDT 2025

authentication                             4.20.0-rc.1   False       False         False      0s      OAuthServerRouteEndpointAccessibleControllerAvailable: Get "https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz": EOF

NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:38 AM EDT 2025
authentication                             4.20.0-rc.1   False       False         False      0s      OAuthServerRouteEndpointAccessibleControllerAvailable: Get "https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz": EOF


NAME      VERSION       AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.20.0-rc.1   True        False         3h29m   Error while reconciling 4.20.0-rc.1: the cluster operator authentication is not available
Mon Sep 15 04:28:40 AM EDT 2025
authentication                             4.20.0-rc.1   True        False         False      1s

Checked the operator logs

Using project "openshift-authentication-operator" on server "https://api.pok-130.ocptest.pok.stglabs.ibm.com:6443".
[root@bastion ~]# la
Warning: apps.openshift.io/v1 DeploymentConfig is deprecated in v4.14+, unavailable in v4.10000+
NAME                                           READY   STATUS    RESTARTS   AGE
pod/authentication-operator-68f9b78996-wcct2   1/1     Running   0          2d2h

NAME              TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
service/metrics   ClusterIP   172.*.*.123   <none>        443/TCP   2d2h

NAME                                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/authentication-operator   1/1     1            1           2d2h

NAME                                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/authentication-operator-68f9b78996   1         1         1       2d2h

Redirected logs to file
llo pod/authentication-operator-68f9b78996-wcct2 > authpod.log

1st Error and last error observed in operator pod logs

I0915 12:35:03.701899       1 status_controller.go:230] clusteroperator/authentication diff {"status":{"conditions":[{"lastTransitionTime":"2025-09-15T04:48:27Z","message":"All is well","reason":"AsExpected","status":"False","type":"Degraded"},{"lastTransitionTime":"2025-09-15T04:59:24Z","message":"AuthenticatorCertKeyProgressing: All is well","reason":"AsExpected","status":"False","type":"Progressing"},{"lastTransitionTime":"2025-09-15T12:35:03Z","message":"OAuthServerRouteEndpointAccessibleControllerAvailable: Get \"https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz\": EOF","reason":"OAuthServerRouteEndpointAccessibleController_EndpointUnavailable","status":"False","type":"Available"},{"lastTransitionTime":"2025-09-15T04:33:55Z","message":"All is well","reason":"AsExpected","status":"True","type":"Upgradeable"},{"lastTransitionTime":"2025-09-15T04:33:54Z","reason":"NoData","status":"Unknown","type":"EvaluationConditionsDetected"}]}}
E0915 12:35:03.734011       1 base_controller.go:279] "Unhandled Error" err="OAuthServerRouteEndpointAccessibleController reconciliation failed: Get \"https://oauth-openshift.apps.pok-130.ocptest.pok.stglabs.ibm.com/healthz\": EOF"

grep -i '"Unhandled Error"' authpod.log |head -n 1
E0915 11:06:44.367223       1 base_controller.go:279] "Unhandled Error" err="StatusSyncer_authentication reconciliation failed: Operation cannot be fulfilled on clusteroperators.config.openshift.io \"authentication\": the object has been modified; please apply your changes to the latest version and try again"
[root@bastion ~]# grep -i '"Unhandled Error"' authpod.log |tail -n 1
E0915 12:35:04.099102       1 base_controller.go:279] "Unhandled Error" err="StatusSyncer_authentication reconciliation failed: Operation cannot be fulfilled on clusteroperators.config.openshift.io \"authentication\": the object has been modified; please apply your changes to the latest version and try again"

All other operators shows Available True since 50 hrs but authentication operator shows 42 hrs

[root@bastion ~]# lco |head -n 5
NAME                                       VERSION       AVAILABLE   PROGRESSING   DEGRADED   SINCE   MESSAGE
authentication                             4.20.0-rc.1   True        False         False      42h     
baremetal                                  4.20.0-rc.1   True        False         False      2d2h    
cloud-controller-manager                   4.20.0-rc.1   True        False         False      2d2h    
cloud-credential                           4.20.0-rc.1   True        False         False      2d2h

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