JDK-6770608 : G1: Mutator thread can flush barrier and satb queues during safepoint
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs14
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2008-11-12
  • Updated: 2010-04-03
  • Resolved: 2008-11-25
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JDK 6 JDK 7 Other
6u14Fixed 7Fixed hs14Fixed
When exiting a mutator thread is removed from the thread list before it has a chance to flush their SATB and barrier queues. If GC happens at this moment the objects that are refererred to from these queues can be moved.

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/da9cb4e97a5f

SUGGESTED FIX The fix is to flush the buffers before removing a thread from the list.