RFR: 8365192: post_meth_exit should be in vm state when calling get_jvmti_thread_state [v10]

[David Holmes]

On Wed, 20 Aug 2025 06:46:03 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> The method
>> get_jvmti_thread_state()
>> should be called only while thread is in vm state.
>> 
>> The post_method_exit is doing some preparation before switching to vm state. This cause issues if thread is needed to initialize jvmti thread state.
>> 
>> The fix was found using jvmti stress agent and thus no additional regression test is required.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/hotspot/share/prims/jvmtiExport.cpp
>   
>   Co-authored-by: David Holmes <62092539+dholmes-ora at users.noreply.github.com>

test/hotspot/jtreg/serviceability/jvmti/events/MethodExit/ExceptionOccurred/libExceptionOccurred.cpp line 35:

> 33: //    has been popped by exception and call 'upCall' mthod using JNI.
> 34: // 2) for upCall method it verifies that event has correct
> 35: //    return value and was not popped by execption.

Suggestion:

//    return value and was not popped by exception.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26713#discussion_r2287292340