jdk16: java/nio/channels/DatagramChannel/SendReceiveMaxSize.java failed on AIX

jdk16: [java/nio/channels/DatagramChannel/SendReceiveMaxSize.java failed on AIX ](https://ci.adoptopenjdk.net/job/Test_openjdk16_hs_extended.openjdk_ppc64_aix_testList_2/9/console)with message:

```
01:48:35 test SendReceiveMaxSize.testSendReceiveMaxSize(SendReceiveMaxSize$$Lambda$49/0x00000000801036b8@639579dc, 65507, /129.33.196.210): success
01:48:35 test SendReceiveMaxSize.testSendReceiveMaxSize(SendReceiveMaxSize$$Lambda$52/0x0000000080103d40@7720c765, 65527, /0:0:0:0:0:0:0:1): failure
01:48:35 java.net.SocketException: A message for a socket data transfer is too long.
01:48:35 at java.base/sun.nio.ch.DatagramChannelImpl.send0(Native Method)
01:48:35 at java.base/sun.nio.ch.DatagramChannelImpl.sendFromNativeBuffer(DatagramChannelImpl.java:897)
```

reran got different error: https://ci.adoptopenjdk.net/view/work-in-progress/job/grinder_sandbox_new/247/console

```
16:17:56 config SendReceiveMaxSize.setUp(): success
16:17:56 test SendReceiveMaxSize.testGetOption(SendReceiveMaxSize$$Lambda$48/0x00000004001034b0@f4bc9dc, 65507, /140.211.9.99): success
16:17:56 test SendReceiveMaxSize.testGetOption(SendReceiveMaxSize$$Lambda$49/0x00000004001036c0@33ca378f, 65507, /140.211.9.99): success
16:17:56 test SendReceiveMaxSize.testGetOption(SendReceiveMaxSize$$Lambda$52/0x0000000400103d48@6f373be2, 65527, /0:0:0:0:0:0:0:1): success
16:17:56 test SendReceiveMaxSize.testGetOption(SendReceiveMaxSize$$Lambda$53/0x0000000400106000@7f6f51e3, 65527, /0:0:0:0:0:0:0:1): success
16:17:56 Timeout refired 960 times
...
TEST RESULT: Error. Program `/home/jenkins/workspace/grinder_sandbox_new/openjdkbinary/j2sdk-image/bin/java' timed out (timeout set to 960000ms, elapsed time including timeout handling was 960573ms).

```

related https://github.com/adoptium/adoptium/issues/63

Start with java/nio/channels/DatagramChannel/SendReceiveMaxSize.java and the linked AIX CI logs; compare the failing IPv6 send case with the successful cases and the rerun timeout. Reproduce the test on AIX and use the test result—no SocketException or timeout—as the completion check.

Written by the indexing model from the issue text.