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We have successfully upgraded EBS 126.96.36.199 to R12.2.4. After the upgrade process completed and we released the instance to users, we are facing oacore hang issue very frequently.
When we have load on server (CPU approx 40%), the oacore process started hanging and unable to get the login page. We need to bounce the whole application to get the login page. This is happening in PROD and bouncing prod application frequently is not permissible. Raised SR with oracle and applied some of oacore one off patches, but still no luck. Increased the Java heap size for oacore but still no luck.
SR is still in progress, meanwhile if anyone faced this kind of issue and can provide a solution to us will be very helpful. oacore log file is attached.
We have performed several upgrade iteration and does not faced this issue. Only in this production instance we are facing the issue.