[crac] RFR: 8372933: [CRaC] Restore failed due to incompatible or missing CPU features, try using -XX:CPUFeatures=0xfoo, 0xbar on checkpoint [v10]

[duke]

On Wed, 4 Feb 2026 08:27:26 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> Since [JDK-8368929](https://bugs.openjdk.org/browse/JDK-8368929) the message:
>> 
>> 
>> Restore failed due to incompatible or missing CPU features, try using -XX:CPUFeatures=0xe14e1805fdfbf7,0xfcc on checkpoint.
>> 
>> 
>> is wrong as it does not do logical and of both CPUFeatures masks.
>> 
>> Yes, I should have caught it during [JDK-8368929](https://bugs.openjdk.org/browse/JDK-8368929) review.
>> 
>> @rvansa will probably want to change the API but this is a PoC how it should work.
>
> Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 16 additional commits since the last revision:
> 
>  - Merge branch 'crac' into crac-conjunction
>  - Revert the check
>  - Fix the sizeof check
>  - get_failed_bitmap: return size_t
>  - Use current_features everywhere
>  - Fix "try using -XX:CPUFeatures" for the 'exact' case.
>  - Check for failed malloc
>  - Fix non-x86 builds
>  - get_failed_bitmap to return stored data
>  - Merge branch 'crac' into crac-conjunction
>  - ... and 6 more: https://git.openjdk.org/crac/compare/c37166d4...d27c0e7a

@jankratochvil 
Your change (at version d27c0e7a06d600dc2edf0706db46e1ae0cb82369) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/crac/pull/278#issuecomment-3847035970