RFR: 8361103: java_lang_Thread::async_get_stack_trace does not properly protect JavaThread [v2]

[Alex Menkov]

On Thu, 10 Jul 2025 07:45:51 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I was thinking simply(?) to change `cv_internal_thread_to_JavaThread` so that it extracts the carrier for a vthread and checks it is within the given threads-list.

I prefer to keep the current behavior for existing callers to be sure they are not affected.
Added extra argument to `cv_internal_thread_to_JavaThread` to return carrrier's JavaThread.

> > Also we need a way to check if specific vthread is mounted to JavaThread (to be checked in handshake)
> 
> Not sure that would be of general use as the answer could change the instant you return from the operation. Explicit checks for being mounted are done within the handshake/safepoint op code as needed.

Ok, kept it as it is

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/26119#discussion_r2198803351