On Tue, 2 Dec 2025 08:15:53 GMT, Serguei Spitsyn <[email protected]> wrote:

>> Patricio Chilano Mateo has updated the pull request incrementally with one 
>> additional commit since the last revision:
>> 
>>   Fix comment in inline_native_vthread_start_transition
>
> src/hotspot/share/runtime/mountUnmountDisabler.cpp line 88:
> 
>> 86:         // We rebinded on start_transition but the mount/unmount 
>> operation
>> 87:         // failed so now we need to rebind to the original state.
>> 88:         _current->rebind_to_jvmti_thread_state_of(_is_mount ? _vthread() 
>> : _current->threadObj());
> 
> Q: Not sure I fully understand this comment. We have done a rebind at the 
> line 67 for an unmount transition only. But this comment tells that it was 
> done for mount transition as well. Also, before this update, we used to do a 
> rebind of `JvmtiThreadState` to a vthread in the 
> `JvmtiVTMSTransitionDisabler::VTMS_mount_end()` for the normal (not failed) 
> case. Please, could you explain a little bit more? It feels like this comment 
> needs a correction.

Yes, well spotted. I changed it to rebind the state only for the mount case, as 
in current code. This already handles a successful mount or a failed unmount. I 
also added and assert to verify we rebinded to the correct identity.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28361#discussion_r2582654454

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