[jdk21u-dev] RFR: 8345296: AArch64: VM crashes with SIGILL when prctl is disallowed [v3]

[Severin Gehwolf]

On Thu, 12 Dec 2024 13:42:00 GMT, Kerem Kat <krk at openjdk.org> wrote:

>> Ref. https://github.com/openjdk/jdk/pull/22479
>> 
>>> We have caught this in some prod environments, where prctl is forbidden by the sandboxing mechanism. This fails the JVM
>> 
>> Does not apply cleanly, the backport depends on `FloatRegister` changes from [JDK-8339063](https://bugs.openjdk.org/browse/JDK-8339063) which are included in `src/hotspot/cpu/aarch64/register_aarch64.hpp`.
>> 
>> Additional testing:
>> 
>> - [x] Verified the bug is fixed with the seccomp repro from [JDK-8345296](https://bugs.openjdk.org/browse/JDK-8345296?focusedId=14727386&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14727386): Segfault without the patch, works with.
>
> Kerem Kat has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix linux-cross-compile aarch64 build.

Since this is related to prctl returning `-1` in some Docker environments on newer MacOS 15.2+. It does not seem reproducible on native Aarch64 Linux or MacOSX 15.2 and there is a work-around, `-XX:UseSVE=0`, lets keep this on the April schedule for now. It should be a safe change, but I don't see the urgency either.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1222#issuecomment-2541096729