RFR: 8372617: Save and restore stubgen stubs when using an AOT code cache [v15]

[Vladimir Kozlov]

On Mon, 23 Feb 2026 16:54:00 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

>> Andrew Dinn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add AOT logging for C strings
>
> I have implemented a fix for for https://bugs.openjdk.org/browse/JDK-8377554 in this branch
> 
>   https://github.com/adinn/jdk/tree/aot_runtime_constants 
> 
> which I have been using to test this current PR. That branch includes a fix to the card table loads in CardTableBarierSetAssembler which removes the two bugs you are seeing
> 
>   https://github.com/openjdk/jdk/commit/00418049d378e7669cb2ad37a113e865b62522f9
> 
> After rebasing this PR on top of the above branch the failing test works with Parallel GC. It also bypasses the crash that made the ZGC test fail. However, I did not raise a PR for my AOTRC patch because I am still seeing a secondary error with the ZGC test. I think it is unrelated but am not sure because I can only reproduce it by downloading the static lib bundle. Since that has no debug info I have to debug the problem using logging and PrintStub tracing.
> 
> The bug happens shortly after an array copy and always seems to involve an attempt to consume an oop in the format 0x00020000000nnnnn. The error is normally a failed load_klass operation (it SEGVs). I have been trying to see if this is an error in the stub code but I printed all the code and relocs and it looked like everything was relocating correctly.
> 
> The 0x00020000 in the top 32 bits makes me wonder if this is an issue storing and loading a heap value from the archive. ZGC is using 0x00004000 to mark oops which makes me supsicious because that equals (0x00020000 >> 3).
> 
> I have just rebased my aot_runtime_constants branch over master which means I will now include Ashu's patch to ensure the configured options do not change. I'll try testing this branch against the rebased patch to make sure that the problem was not related to an option change.

Thank @adinn 

Did you look why hs_err has `final_blob (stub gen)` instead of actual stubs names?

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PR Comment: https://git.openjdk.org/jdk/pull/28433#issuecomment-3946504344