RFR: 8319935: Ensure only one JvmtiThreadState is create for one JavaThread associated with attached native thread [v3]

[Serguei Spitsyn]

On Mon, 20 Nov 2023 19:28:13 GMT, Jiangli Zhou <jiangli at openjdk.org> wrote:

>> Please review JvmtiThreadState::state_for_while_locked change to handle the state->get_thread_oop() null case. Please see https://bugs.openjdk.org/browse/JDK-8319935 for details.
>
> Jiangli Zhou has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add a check for a thread is_attaching_via_jni, based on David Holmes' comment.

Thank you for filing and fixing this issue!  I'm kind of late here. Sorry for that.
Is it hard to create a JTreg test for an attaching native thread? I can help if you have a standalone prototype.
You can look for some examples in the folder: `test/hotspot/jtreg/serviceability/jvmti/vthread`.

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PR Comment: https://git.openjdk.org/jdk/pull/16642#issuecomment-1821944429