Bug ID: JDK-8221435 Shenandoah should not mark through weak roots

JDK-8221435 : Shenandoah should not mark through weak roots

Type: Enhancement
Component: hotspot
Sub-Component: gc
Affected Version: 8-shenandoah,11-shenandoah,13

Priority: P3
Status: Resolved
Resolution: Fixed

Submitted: 2019-03-25
Updated: 2019-05-22
Resolved: 2019-03-29

Versions (Unresolved/Resolved/Fixed)

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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 13
13 b15Fixed

Related Reports

Blocks :	JDK-8221102 - Allow GC threads to participate in threads claiming protocol
Blocks :	JDK-8220671 - Initialization race for non-JavaThread PtrQueues
Blocks :	JDK-8221629 - Shenandoah: Cleanup class unloading logic
Relates :	JDK-8221688 - Quarantine Shenandoah string dedup tests

Description

Shenandoah marks through weak roots on every cycle that does not process references, which is wrong.

Comments

Webrev: http://cr.openjdk.java.net/~zgu/JDK-8221435/webrev.01/

28-03-2019

This patch exaggerates the problems of these two bugs (JDK-8221102 and JDK-8220671). We may need to consider quarantining string dedup tests if they can not be fixed soon.

28-03-2019