Aarch64 and Cortex A53 - broken since 21.0.7

[Duft Markus]

Good Morning,

As documented in much detail in the following ticket, 21.0.7 broke Aarch64 support on the Cortex A53 CPU.

https://github.com/adoptium/adoptium-support/issues/1295

There is a reproducer in the Ticket, basically the steps are:


  *
Setup Ubuntu cloud image on qemu-system-aarch64, and use a Cortex A53 CPU
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Download and use Java 21.0.7+6 - I tried Temurin, Microsoft and Azul. All misbehave.
  *
"Using" means e.g. running ./gradlew tasks on any freshly downloaded repo, e.g. the gradle sample repo.
  *
... or running any more complex java program, which immediately exhibits strange behavior like these:
     *
java.security.ProviderException: Cannot find aliases for HmacSHA512
        *
Note: It is not a specific algorithm which is not found, it just randomly fails on very different ones.
     *
java.lang.IllegalArgumentException: java.lang.ClassFormatError: Duplicate method name "toString" with signature "()Ljava.lang.String;" in class file jdk/proxy2/$Proxy3
     *
Exception in thread "main" java.lang.annotation.IncompleteAnnotationException: java.lang.annotation.Retention missing element value
     *
... and even more ...
        *
Another note: of course the very same binaries run without any issue on other CPUs, like the A57 for instance.

I first thought that this is an issue with my actual A53 hardware I have here. However since this behavior is the same also on an emulated A53 in QEMU: here I am reporting 🙂

Versions before 21.0.7(+?) do not expose these problems. I can run any program just fine on 21.0.6+7 and older.

The GitHub issue has a lot of information already present, but I can provide more on demand - both from an emulator as well as the real hardware.

Any help would be greatly appreciated - even if it is a statement that A53 is no longer supported (which would be a bummer, we have a lot of hardware with those CPUs).

Best, Markus

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