JDK-6692906 : CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs12,hs20,6u14,7
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,linux
  • CPU: generic,x86
  • Submitted: 2008-04-23
  • Updated: 2013-09-12
  • Resolved: 2011-03-07
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JDK 6 JDK 7 Other
6u22-revFixed 7Fixed hs19Fixed
Related Reports
Relates :  
Relates :  
The situation is most easily exhibited on, for example, a Huron or Maramba,
where we get a large number of ParallelCMSThreads, using one of the
vm.parallel_class_loading tests.

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/c99c53f07c14

SUGGESTED FIX See URL in Evaluation section for final fix & for backports.

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/c99c53f07c14

EVALUATION See comments section.

WORK AROUND Disable parallel concurrent marking via either:- -XX:-CMSConcurrentMTEnabled OR -XX:ParallelCMSThreads=0