RFR: 8304725: AsyncGetCallTrace can cause SIGBUS on M1 [v3]

[Johannes Bechberger]

On Thu, 23 Mar 2023 08:36:59 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> The best alternative to me is to take the perf hit and disable the caching when we're in forte (possibly only on Mac).
>
>> The best alternative to me is to take the perf hit and disable the caching when we're in forte (possibly only on Mac).
> 
> Sounds like a plan.

> Reading @fisk excellent catch the async safety of stacking the wx raii mechanics, I retract my approval. This looks like a recipe for hard-to-find bugs :-/

Yes, this is my current thought too.

> Incidentally, do we see in the hs_err file whether async profiler is attached? We should maybe make that prominently visible.

We see ASGCT in the stack trace, but what exactly do you mean.

> I feel there are information missing :)

But would you be okay with disabling the cache modification if the perf impact is low?

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PR Comment: https://git.openjdk.org/jdk/pull/13144#issuecomment-1480883378