[jdk11u-dev] RFR: 8327650: Test java/nio/channels/DatagramChannel/StressNativeSignal.java timed out

[SendaoYan]

Hi all,

This pull request contains a backport of commit [7acfba28](https://github.com/openjdk/jdk/commit/7acfba288ff4d1f43cc36506b2bd2d32107b00c2) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository. This PR fix the test bug which cause test intermittent fails. The change has been verified locally, test-fix only, no risk.

The commit being backported was authored by Mark Sheppard on 5 Jun 2024 and was reviewed by Brian Burkhalter.

Thanks!

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Commit messages:
 - Backport 7acfba288ff4d1f43cc36506b2bd2d32107b00c2

Changes: https://git.openjdk.org/jdk11u-dev/pull/2980/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2980&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327650
  Stats: 110 lines in 1 file changed: 74 ins; 10 del; 26 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2980.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2980/head:pull/2980

PR: https://git.openjdk.org/jdk11u-dev/pull/2980