RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v23]

Wed Mar 3 16:00:00 UTC 2021

On Tue, 2 Mar 2021 23:21:28 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Note that `thread` can be NULL here if the signal handler is running in a non-attached thread. If we then perform:
> `ThreadWXEnable(WXMode new_mode, Thread* thread = NULL) : _thread(thread ? thread : Thread::current()),`
> we call Thread::current() on a non-attached thread and that will assert/crash if we get NULL. Either avoid using WX when the thread is NULL, or else change to use Thread::current_or_null_safe() and ensure all uses have a NULL check.

https://bugs.openjdk.java.net/browse/JDK-8262903 tracks this issue.

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PR: https://git.openjdk.java.net/jdk/pull/2200