We are getting test failures on AIX since JDK-8339285:
test TestByteBuffer.testChannel(): failure
test TestByteBuffer.testLargeMappedSegment(): failure
test TestByteBuffer.testMapOffset(): failure
test TestByteBuffer.testMappedSegment(): failure
test TestByteBuffer.testMappedSegmentAsByteBuffer(): failure
test TestByteBuffer.testMappedSegmentOffset(): failure
test TestByteBuffer.testMappedSegmentOperations(LOAD): failure
test TestByteBuffer.testMappedSegmentOperations(UNLOAD): failure
test TestByteBuffer.testMappedSegmentOperations(IS_LOADED): failure
test TestByteBuffer.testMappedSegmentOperations(FORCE): failure
test TestByteBuffer.testMappedSegmentOperations(BUFFER_LOAD): failure
test TestByteBuffer.testMappedSegmentOperations(BUFFER_IS_LOADED): failure
test TestByteBuffer.testMappedSegmentOperations(BUFFER_FORCE): failure

The error is always:
java.lang.NoClassDefFoundError: Could not initialize class java.nio.MappedMemoryUtils
        at java.base/java.nio.Buffer$2.mappedMemoryUtils(Buffer.java:892)
        at java.base/jdk.internal.foreign.MappedMemorySegmentImpl.isLoaded(MappedMemorySegmentImpl.java:90)
        at TestByteBuffer.testLargeMappedSegment(TestByteBuffer.java:352)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:573)
        at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:599)
        at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:174)
        at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
        at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:822)
        at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:147)
        at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
        at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at org.testng.TestRunner.privateRun(TestRunner.java:764)
        at org.testng.TestRunner.run(TestRunner.java:585)
        at org.testng.SuiteRunner.runTest(SuiteRunner.java:384)
        at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:378)
        at org.testng.SuiteRunner.privateRun(SuiteRunner.java:337)
        at org.testng.SuiteRunner.run(SuiteRunner.java:286)
        at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
        at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
        at org.testng.TestNG.runSuitesSequentially(TestNG.java:1218)
        at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
        at org.testng.TestNG.runSuites(TestNG.java:1069)
        at org.testng.TestNG.run(TestNG.java:1037)
        at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:102)
        at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:58)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:573)
        at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
        at java.base/java.lang.Thread.run(Thread.java:1575)
Caused by: java.lang.ExceptionInInitializerError: Exception java.io.IOException: Not enough space [in thread "MainThread"]
        at java.base/java.nio.MappedMemoryUtils.isLoaded0(Native Method)
        at java.base/java.nio.MappedMemoryUtils.<clinit>(MappedMemoryUtils.java:130)
        at java.base/java.nio.MappedByteBuffer.force(MappedByteBuffer.java:316)
        at java.base/java.nio.MappedByteBuffer.force(MappedByteBuffer.java:257)
        at TestByteBuffer.lambda$testChannel$0(TestByteBuffer.java:203)
        at TestByteBuffer.withMappedBuffer(TestByteBuffer.java:368)
        at TestByteBuffer.testChannel(TestByteBuffer.java:200)
        ... 29 more

java/nio/Buffer/Basic.java and sun/misc/InvokeCleaner.java fail in a similar way.