RFR: 8359820: SIGILL with low -XX:HandshakeTimeout

Tue Jul 15 10:55:52 UTC 2025

Hi, please consider the following changes:

we augment the SIGILL handling in `os::signal_thread` with proper logging so that the initial crash information goes to stdout/stderr as well. 

The problem in the issue description is not a problem by itself, the behavior is not unexpected, but it is somewhat difficult to find out what caused SIGILL to be fired.

Tested in tiers 1-3.

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Commit messages:
 - Merge remote-tracking branch 'origin/master' into JDK-8359820-SIGILL-with-low-handshake-timeout-on-intel-sde
 - 8359820: Augmented SIGILL handling to trace handshake timeout better.

Changes: https://git.openjdk.org/jdk/pull/26309/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26309&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359820
  Stats: 4 lines in 2 files changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26309.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26309/head:pull/26309

PR: https://git.openjdk.org/jdk/pull/26309