RFR: 8359820: Improve handshake/safepoint timeout diagnostic messages [v3]

[David Holmes]

On Fri, 18 Jul 2025 08:15:36 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> I have nothing against making this clearer, just saying that the info is already kind of there.

Yes, but there are a few reasons a SIGILL may have been fired at a thread, so it would be useful to get a clear indication of exactly why it happened. Not everyone will realize/know that SIGILL happens because of a timeout in handshake/safepoint.

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PR Comment: https://git.openjdk.org/jdk/pull/26309#issuecomment-3088691121