RFR: 8337331: crash: pinned virtual thread will lead to jvm crash when running with the javaagent option [v12]

[Jiawei Tang]

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

Jiawei Tang has updated the pull request incrementally with one additional commit since the last revision:

  fix the test condition to avoid NoClassDefFoundError

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20373/files
  - new: https://git.openjdk.org/jdk/pull/20373/files/e81db430..05888a25

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20373&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20373&range=10-11

  Stats: 1 line in 1 file changed: 1 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