[jdk21u-dev] RFR: 8343607: C2: Shenandoah crashes during barrier expansion in Continuation::enter

Fri Aug 1 23:11:05 UTC 2025

Clean backport of this shenandoah c2 fix. We hit this bug in our (Amazon) internal CI system and also was reported by RedHat to happen on their CI as well.

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Commit messages:
 - Backport 45c914c3ad8fbc406af9ba9dec97f11c28c91299

Changes: https://git.openjdk.org/jdk21u-dev/pull/2029/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2029&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343607
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2029.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2029/head:pull/2029

PR: https://git.openjdk.org/jdk21u-dev/pull/2029