[jdk25u-dev] RFR: 8371864: GaloisCounterMode.implGCMCrypt0 AVX512/AVX2 intrinsics stubs cause AES-GCM encryption failure for certain payload sizes

[Aleksey Shipilev]

On Wed, 3 Dec 2025 10:36:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Fixes another JDK 25 regression in AES/GCM on x86_64.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, AVX2 machine, new regression test fails without the patch, passes with it
>  - [x] Linux x86_64 server fastdebug, AVX2 machine, `jdk_security`
>  - [x] Linux x86_64 server fastdebug, AVX-512 machine, new regression test fails without the patch, passes with it
>  - [x] Linux x86_64 server fastdebug, AVX-512 machine, `jdk_security`
>  - [x] Linux x86_64 server fastdebug, AVX-512 machine, `all`

Tests are all passing. I am putting the stick in the ground here, and will request approval next week, seeing if we have any bugtail from the fix in mainline.

-------------

PR Comment: https://git.openjdk.org/jdk25u-dev/pull/54#issuecomment-3607308500