RFR: 8225354: serviceability/jvmti/ModuleAwareAgents/ThreadStart failed with Didn't get ThreadStart events in VM early start phase! [v3]

[Serguei Spitsyn]

On Tue, 24 Jun 2025 23:53:23 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> I thought if we need some sanity test for ThreadStart event with can_generate_early_vmstart capability, but looking at the spec I see no relations between them. So it's unclear what was the purpose of the test.

The test purpose was to ensure the `ThreadStart` are posted in the early `VM_START` phase. The issue is that a few system threads are triggered to start in the early `VM_START` but there is no guaranty they are really started in that phase because of a race with the VM initializing thread.

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PR Comment: https://git.openjdk.org/jdk/pull/25948#issuecomment-3002273203