The completely unrelated fix to [JDK-8335124](https://bugs.openjdk.org/browse/JDK-8335124) led me to believe that the issue with sometimes not being able to get the stack trace of the SteadyStateThread might be due to the thread being active for a short period after being reported as in the Thread.State.BLOCKED state. Once set to that state, the thread still needs to call a native OS API to block the thread so it is truly idle. During this time the thread stack might be inconsistent and not walk-able. The fix is to add a short sleep after the thread has moved to the Thread.State.BLOCKED state to give it a chance to finish blocking.
------------- Commit messages: - Add a 1/2 second delay to make sure the SteadyStateThread is blocked and idle. Changes: https://git.openjdk.org/jdk/pull/19951/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19951&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8269881 Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/19951.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19951/head:pull/19951 PR: https://git.openjdk.org/jdk/pull/19951
