RFR: 8314679: SA fails to properly attach to JVM after having just detached from a different JVM

[Chris Plummer]

On Tue, 22 Aug 2023 23:22:37 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> The CDS archive can change memory locations on different runs of the same JVM binary. This exposed a long standing bug in FileMapInfo.java. It was caching addresses that could be different for different JVM processes. As a result, doing an attach, detach, and then another attach to a different JVM process was resulting in various exceptions because the contents of CDS memory was not as expected.
> 
> Tested by running all serviceability/sa tests. Also tested with ZGC and generational ZGC.

Thanks for the reviews Kevin and David!

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PR Comment: https://git.openjdk.org/jdk/pull/15395#issuecomment-1690570422