Before posting the VM_DEATH event the JVMTI code spins for up to 60 seconds to allow in-progress callbacks to complete. If one of those callbacks requires a safepoint while executing, then it will not be able to attain it until the 60s spin is over - thus causing an apparent "hang" at VM termination. The simple fix is to insert a `ThreadBlockInVM` in the loop so that safepoint requests are honored.
Testing: - tiers 1-5 - new regression test Thanks. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - 8387045: JDK with transformer agent hangs on shutdown Changes: https://git.openjdk.org/jdk/pull/31982/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31982&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8387045 Stats: 165 lines in 2 files changed: 165 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/31982.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31982/head:pull/31982 PR: https://git.openjdk.org/jdk/pull/31982
