RFR: 8296469: Instrument VMError::report with reentrant iteration step for register and stack printing

[Axel Boldt-Christmas]

On Wed, 9 Nov 2022 07:23:42 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> It would be nice to know why register printing crashes, and if there is something we could do to make it more robust, like checking os::is_readable_pointer().

Personally I have only seen it inside gc code when working on generational ZGC and experimenting with some new features, especially when working on enhanced print_location printing where I break some invariants, (because we are already crashing) to sometimes print more detailed information based on potentially stale / racy data. I have only really seen it happen when I do something really stupid 😄 

I know the this whole feature came up in discussions at the office where people expressed their annoyance at having register printing being interrupted half way through. So maybe someone else have a more concrete example of this occurring.

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PR: https://git.openjdk.org/jdk/pull/11017