Summary
Kernel logs a warning message in syslog and hangs while or after applying GI RU 19.19.0.0.230418 (April'23).
Symptoms
When Oracle tries to load the oracleoks module, the following messages will be logged in syslog:
Apr 20 08:14:00 rac1 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 41s! [modprobe:53251]
The system will become unresponsive after a while.
Affected Products
FlashGrid Cluster on AWS/Azure/GCP
Affected Versions
RHEL 8 (or Oracle Linux 8 with RHCK kernel) kernel versions: 4.18.0-425.10.1.el8 or higher
Grid Infrastructure April 2023 Release Update 19.19.0.0.230418 (or any Grid Infrastructure version with patch 34718455 installed).
Root Cause
oracleoks module included in GI RU 19.19.0.0.230418 (and also in patch 34718455) is not compatible with kernel versions 4.18.0-425.10.1.el8 or higher. However, it attempts to load causing the soft lockup.
Resolution
If you want to apply the release update: install the Grid Infrastructure April 2023 Release Update 19.19.0.0.230418 only in combination with GI patch 35068505 and in manual (no opatchauto) mode.
If you want to update the kernel: install GI patch 35068505 before updating the kernel.