JDK-8231250 : Shenandoah: Traversal GC should keep alive weak load from heap
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 14
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-09-19
  • Updated: 2019-09-30
  • Resolved: 2019-09-23
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JDK 14
14 b16Fixed
Related Reports
Relates :  
JDK-8230483 - Shenandoah: consistently disable concurrent roots for Traversal mode
Relates :  
JDK-8227635 - Shenandoah: SHBSA::load_at() needs to deal IN_NATIVE load
Description
Many thanks to Christroph Langer (SAP) for reporting and helping to verify the problem.

The initial report was recorded in JDK-8230483, unfortunately, it did not fix the problem.

The root cause is that JDK-8227635 work changed behavior of traversal GC, which is required to always enqueue new value.
Comments
URL: https://hg.openjdk.java.net/jdk/jdk/rev/e27564cd10e3 User: zgu Date: 2019-09-23 18:39:45 +0000
23-09-2019
Although SAP reported that the patch did not fix the problem, but the fix is legit. Change synopsis to reflect the real problem.
23-09-2019