RFR: 8345296: AArch64: VM crashes with SIGILL when prctl is disallowed

[Aleksey Shipilev]

On Mon, 2 Dec 2024 13:40:27 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Huh. That's annoying.  

Yes.

> Does this patch mean that a warning is printed unconditionally on systems where `prctl` is disabled?

Unfortunately, yes. On the other hand, I believe it is recognized that disabling "innocuous" `prctl` queries is not great. We really just want a more graceful JVM behavior in these cases. Anything apart VM crash would do better. The alternative is to exit the VM and ask users to `UseSVE=0` manually. Doing this automatically and proceeding with the warning looks like a sane middle ground.

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PR Comment: https://git.openjdk.org/jdk/pull/22479#issuecomment-2511637673