RFR: 8330174: Protection zone for easier detection of accidental zero-nKlass use [v8]

[Thomas Stuefe]

On Wed, 26 Feb 2025 09:51:06 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Looks good to me!
>
>> Looks good to me!
> 
> Thank you @rkennke and @iklam !

> @tstuefe your new test is failing on all platforms in our CI.
> 
> ```
> ----------System.err:(23/1185)----------
>  stdout: [[0.001s][info][metaspace]  - commit_granule_bytes: 65536.
> [0.001s][info][metaspace]  - commit_granule_words: 8192.
> [0.001s][info][metaspace]  - virtual_space_node_default_size: 8388608.
> [0.001s][info][metaspace]  - enlarge_chunks_in_place: 1.
> [0.054s][error][cds      ] An error has occurred while processing the shared archive file.
> [0.054s][error][cds      ] Unable to map shared spaces
> Error occurred during initialization of VM
> Unable to use shared archive.
> ];
>  stderr: []
>  exitValue = 1
> 
> java.lang.RuntimeException: did not find Narrow klass base in log output
> ```
> 
> Sorry not in a position to file a bug at the moment.

okay, I prepared a backout; waiting for GHAs to finish : https://github.com/openjdk/jdk/pull/23799

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PR Comment: https://git.openjdk.org/jdk/pull/23190#issuecomment-2684807739