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While this fix has been backported to 8u, the G1 code still uses the os::processor_count() and so will over-provision the number of threads. To address that we need to backport JDK-8147910 (to get the os::initial_active_processor_count() API) and JDK-8161993 (which updates G1 to use the new API).
Other GC's will see the active processor count change, but may then be affected by the same problems as G1 if that value changes while the VM is running. So the two backports are needed regardless.