Bug ID: JDK-8307395 Add missing STS to Shenandoah

Type: Bug
Component: hotspot
Sub-Component: gc
Affected Version: 17,20,21

Priority: P4
Status: Resolved
Resolution: Fixed
OS: generic
CPU: generic

Submitted: 2023-05-03
Updated: 2024-07-23
Resolved: 2023-05-05

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JDK 17	JDK 21
17.0.9Fixed	21 b22Fixed

Testing in project Lilliput has revealed that Shenandoah GC is lacking one STS. This causes a reliable crash (with Lilliput) when running TestGCBasherWithShenandoah.java with -XX:+UseHeavyMonitors because it touches an already deflated monitor.

Fix Request (17u) Improves Shenandoah reliability. Applies cleanly. Tests pass.
30-05-2023
A pull request was submitted for review. URL: https://git.openjdk.org/jdk17u-dev/pull/1410 Date: 2023-05-30 10:15:44 +0000
30-05-2023
Changeset: 3968ab5d Author: Roman Kennke <rkennke@openjdk.org> Date: 2023-05-05 15:56:10 +0000 URL: https://git.openjdk.org/jdk/commit/3968ab5db5443ce93c9a19ebbc5464f7d91782fc
05-05-2023
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/13799 Date: 2023-05-04 11:34:15 +0000
04-05-2023
A pull request was submitted for review. URL: https://git.openjdk.org/lilliput/pull/90 Date: 2023-05-03 19:51:00 +0000
03-05-2023

Relates :	JDK-8307236 - Rendezvous GC threads under STS for monitor deflation
Relates :	JDK-8324225 - Shenandoah: VMThread may become unable to complete safepoint synchronization
Relates :	JDK-8334482 - Shenandoah: Deadlock when safepoint is pending during nmethods iteration