[jdk21u-dev] RFR: 8269657: Test java/nio/channels/DatagramChannel/Loopback.java failed: Unexpected message

[SendaoYan]

Hi all,

This pull request contains a backport of commit [c798316b](https://github.com/openjdk/jdk/commit/c798316bc4cb33fd902f926030d8a0b6870d661a) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by SendaoYan on 28 Jun 2024 and was reviewed by Daniel Fuchs.

Thanks!

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Commit messages:
 - Backport c798316bc4cb33fd902f926030d8a0b6870d661a

Changes: https://git.openjdk.org/jdk21u-dev/pull/847/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=847&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8269657
  Stats: 11 lines in 1 file changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/847.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/847/head:pull/847

PR: https://git.openjdk.org/jdk21u-dev/pull/847