RFR: 8332535: Mark java/nio/channels/DatagramChannel/Loopback.java as intermittent [v4]

[Daniel Fuchs]

On Wed, 26 Jun 2024 12:40:41 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>>   The test `test/jdk/java/nio/channels/DatagramChannel/Loopback.java` intermittent fail, the failure probability is about 2/1000. This PR mark this test intermittent, and print more messages to investigate the intermittent failure. Only change the testcase, no risk.
>
> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   compare ByteBuffer with mismatch()

test/jdk/java/nio/channels/DatagramChannel/Loopback.java line 166:

> 164:                             System.out.println("src: " + src + "not equal to dst: " + dst);
> 165:                             dst.clear();
> 166:                             continue;

So if this happens we will go back waiting for 3 more seconds. We're not supposed to receive stray datagrams here, so I assume it might be OK to respin with 3 full seconds as this shouldn't happen too often...

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PR Review Comment: https://git.openjdk.org/jdk/pull/19314#discussion_r1655002551