RFR: 8296324: JVMTI GetStackTrace truncates vthread stack trace for agents loaded into running VM

[Leonid Mesnik]

On Thu, 17 Nov 2022 09:12:07 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> The `VirtualThread` static field `notifyJvmtiEvents` is not set correctly in cases JVMTI agents are loaded into running VM. It is because an extra call to java_lang_VirtualThread::init_static_notify_jvmti_events() is needed.
> This function is called once at the VM initialization, so this extra call is not necessary for agent loaded at startup.
> 
> Testing:
> New test is added: `test/hotspot/jtreg/serviceability/jvmti/vthread/VirtualStackTraceTest`
> This test is failed without fix and passed with it.
> TBD: run all JVMTI and JDI test in mach5.

test/hotspot/jtreg/serviceability/jvmti/vthread/VirtualStackTraceTest/VirtualStackTraceTest.java line 27:

> 25:  * @test
> 26:  * @summary Verifies JVMTI GetStackTrace does not truncate virtual thread stack trace with agent attach
> 27:  * @requires vm.continuations

@requires vm.jvmti is also needed

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PR: https://git.openjdk.org/jdk/pull/11204