java/util/StringJoiner/StringJoinerTest.java failed due to OOM

The following test failed in the JDK16 CI:

java/util/StringJoiner/StringJoinerTest.java

Here's a snippet from the log file:

----------System.out:(60/3434)----------
[TestNG] Running:
  java/util/StringJoiner/StringJoinerTest.java

test StringJoinerTest.OOM1(): success
test StringJoinerTest.OOM2(): success
test StringJoinerTest.OOM3(): failure
java.lang.OutOfMemoryError: Java heap space
at java.base/java.lang.String.repeat(String.java:3578)
at StringJoinerTest.OOM3(StringJoinerTest.java:352)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)
test StringJoinerTest.OOM4(): success
test StringJoinerTest.addAddAll(): success
test StringJoinerTest.addAlladdAll(): success
test StringJoinerTest.addCharSequence(): success
test StringJoinerTest.addCharSequenceWithEmptyValue(): success
test StringJoinerTest.addString(): success
test StringJoinerTest.lengthWithCustomEmptyValue(): success
test StringJoinerTest.noAddAndEmptyValue(): success
test StringJoinerTest.setDelimiterNull(): success
test StringJoinerTest.setEmptyValueNull(): success
test StringJoinerTest.setPrefixNull(): success
test StringJoinerTest.setSuffixNull(): success
test StringJoinerTest.stringFromtoString(): success
test StringJoinerTest.stringFromtoStringWithEmptyValue(): success
test StringJoinerTest.testDelimiterCombinations(): success
test StringJoinerTest.toStringWithCustomEmptyValue(): success

===============================================
java/util/StringJoiner/StringJoinerTest.java
Total tests run: 19, Failures: 1, Skips: 0
===============================================

----------System.err:(14/858)----------

I'm starting this bug at P2 since this is a Tier1 failure.