Test java/foreign/TestByteBuffer.java fails on AIX in subtest testMappedSegmentAsByteBuffer. Native C-method msync() returns with errno EINVAL because flag MS_SYNC is set although the preceding call for mmap issued mode MAP_PRIVATE. This is working as documented for AIX (msync Subroutine - IBM Documentation). Other Unix implementations like linux do not have this restriction.
 
According to javadoc of the calling java method java.base/java/nio/MappedByteBuffer.force() (MappedByteBuffer (Java SE 21 & JDK 21 [build 25])) this combination of flags should be allowed to result in a noop call of force(). Therefore, the failing call of msync should be avoided at least for AIX if according mmap was using flag MAP_PRIVATE.
 
Problem: in the current sequence of calls, this information is not available in the method calling msync().


java.io.UncheckedIOException: java.io.IOException: Invalid argument (msync with parameter MS_SYNC failed)
at java.base/java.nio.MappedMemoryUtils.force(MappedMemoryUtils.java:105)
at java.base/java.nio.Buffer$2.force(Buffer.java:890)
at java.base/jdk.internal.misc.ScopedMemoryAccess.forceInternal(ScopedMemoryAccess.java:317)
at java.base/jdk.internal.misc.ScopedMemoryAccess.force(ScopedMemoryAccess.java:305)
at java.base/jdk.internal.foreign.MappedMemorySegmentImpl.force(MappedMemorySegmentImpl.java:92)
at TestByteBuffer.testMappedSegmentAsByteBuffer(TestByteBuffer.java:321)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:599)
at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:174)
at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
at org.testng.internal.TestInvoker$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:1593)
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:580)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.io.IOException: Invalid argument (msync with parameter MS_SYNC failed)
at java.base/java.nio.MappedMemoryUtils.force0(Native Method)
at java.base/java.nio.MappedMemoryUtils.force(MappedMemoryUtils.java:103)
... 34 more