RFR: 8329109: Threads::print_on() tries to print CPU time for terminated GC threads

[Albert Mingkun Yang]

On Thu, 28 Mar 2024 15:14:21 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

> WatcherThread, NativeHeapTrimmerThread can also be terminated.

I see.

I notice that `Thread::print_on` contains `if (osthread() != nullptr) {` to skip some threads. Is it possible to expand this condition to skip zombie ones? (Or set `_osthread` to nullptr when a thread enters zombie state.)

> (Btw: G1CollectedHeap::stop() doesn't stop G1CollectedHeap::_cm. Likely an oversight)

`_cm` is not a thread; it's the data structure used by `_cm_thread`. Therefore, it shouldn't/can't be stopped.

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PR Comment: https://git.openjdk.org/jdk/pull/18518#issuecomment-2025627393