RFR: 8332738: Debug agent can deadlock on callbackLock when using StackFrame.PopFrames

[Serguei Spitsyn]

On Mon, 22 Jul 2024 20:32:35 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Fix deadlock with debug agent callbackLock. Details in first comment.
> 
> Tested by running all jdi, jdwp, and jdb tests with and without virtual threads about 40 times. The testing was initially done with my hack to force the self suspend (see the first comment in the CR), and then I did final testing without it. I also did final testing with all tier5 svc tests.

This looks good.

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

Marked as reviewed by sspitsyn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20282#pullrequestreview-2201548166