Migrating from JDK8 to JDK17/21, sometimes threads start very slowly

[xiezhaokun]

When migrating from JDK8 to JDK17 or JDK21, I encountered slow thread startup, sometimes taking over 30 seconds. I suspect this is caused by the Thread SMR mechanism.

Related issue links:

https://bugs.openjdk.org/browse/JDK-8365974

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