[jdk21u-dev] RFR: 8333783: java/nio/channels/FileChannel/directio/DirectIOTest.java is unstable with AV software

[Rui Li]

A clean backport for JDK-8333783.

Backport for parity with oracle. Stabilize test `DirectIOTest.java`. The test passed locally. Low risk - test changes.

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Commit messages:
 - Backport 8c6d12250b524c0f4ee25dbbc6fe959581b7617b

Changes: https://git.openjdk.org/jdk21u-dev/pull/2334/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2334&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333783
  Stats: 107 lines in 2 files changed: 67 ins; 23 del; 17 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2334.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2334/head:pull/2334

PR: https://git.openjdk.org/jdk21u-dev/pull/2334