RFR: 8306324: StopThread results in thread being marked as interrupted, leading to unexpected InterruptedException [v3]

[Serguei Spitsyn]

On Tue, 29 Jul 2025 23:45:09 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I don't think the current proposed change (which drop's setting the interrupt flag in install_async_exception) will cause a target thread blocked in sleep to wakeup. A target thread blocked in JavaThread::sleep_nanos will wakeup from park_nanos but will just park again with the remaining time.

Thank you checking this. I've restored the tweak in the `JavaThread::sleep_nanos()`.

>  I assume this is the test failures that Serguei mentions.

The test failures I mentioned were after an attempt to remove the following lines from the `JavaThread::install_async_exception()`:

  oop vt_oop = vthread();
  if (vt_oop == nullptr || !vt_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
    // Interrupt thread so it will wake up from a potential wait()/sleep()/park()
    this->interrupt();
  }
``` 
In order to remove the above a corresponding update in the jdwp/debugger is additionally needed to invoke the JVMTI `ThreadInterrupt()`.

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PR Comment: https://git.openjdk.org/jdk/pull/26365#issuecomment-3135163510