RFR: 8370527: Memory leak after 8316694: Implement relocation of nmethod within CodeCache

[Chad Rakoczy]

On Mon, 27 Oct 2025 19:48:10 GMT, Chad Rakoczy <duke at openjdk.org> wrote:

> [JDK-8370527](https://bugs.openjdk.org/browse/JDK-8370527)
> 
> [JDK-8316694](https://bugs.openjdk.org/browse/JDK-8316694) introduced an `immutable_data_references_counter` which keeps track of the number of nmethods using the immutable data so it can be shared between relocated nmethods. The old code reads the counter, decrements the counter, and then checks the first read to see if it is zero. Since the check is performed on the initial read it will never be zero which causes immutable data to never be freed.

@lmesnik My ad hoc testing shows that the immutable data is now being freed. Could you re-run the stress test to verify the memory leak is fixed on your end?

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PR Comment: https://git.openjdk.org/jdk/pull/28008#issuecomment-3453467946