While doing the testing recently. I found out that these two testcase(below) are failing with timeout. Failure is reproducible in "release-vm", "fastdebug-vm" and of course "slowdebug-vm". I tried to trace back the history and found out that these are passing in JDK17 and are failing in JDK20. I didn't test JDK-18,19 for now.

# other_errors.txt
java/util/concurrent/atomic/DoubleAdderDemo.java
java/util/concurrent/atomic/LongAdderDemo.java

To reproduce you can run this command: make exploded-test TEST="./test/jdk/java/util/concurrent/atomic" JTREG="VM_OPTIONS=-Xint"

This is the result I got on s390x (Z15) machine (fastdebug-vm):

==============================
Test summary
==============================
   TEST TOTAL PASS FAIL ERROR
>> jtreg:./test/jdk/java/util/concurrent/atomic 6 4 0 2 <<
==============================
TEST FAILURE