RFR: 8366328: G1: Crash on reading os::thread_cpu_time

[Stefan Karlsson]

On Thu, 4 Sep 2025 07:48:11 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

> Hi,
> 
> Please review this patch to ensure that we do not attempt to read CPU time for GC threads that have already been terminated.
> 
> Testing: Tier 1-3.

Did you consider the alternative to prevent the GC from starting a GC pause if the JVM is shutting down?

Is it correct that CollectedHeap::stop() can only be called when no STW safepoint operation is executing?

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PR Review: https://git.openjdk.org/jdk/pull/27087#pullrequestreview-3184025533