RFR: 8337331: crash: pinned virtual thread will lead to jvm crash when running with the javaagent option

[Jiawei Tang]

I add the testcase which can reproduce the crash. I hope that I could get some advise if the codes need changing.

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Commit messages:
 - 8337331: crash: pinned virtual thread will lead to jvm crash when running with the javaagent option

Changes: https://git.openjdk.org/jdk/pull/20373/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20373&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337331
  Stats: 135 lines in 3 files changed: 135 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20373.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20373/head:pull/20373

PR: https://git.openjdk.org/jdk/pull/20373