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  1. JDK
  2. JDK-6478068

Endless FullGCs which slowly grow ParOldGen and seem to lock up the VM

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    • gc
    • b02
    • generic
    • generic

    Description

      Execution of the test
      gc/gctests/LinearListLow
      after several iterations seems to go into infinite loop of FullGCs. Running with -XX:+PrintGCDetails goes like this:

      [Full GC [PSYoungGen: 28672K->28672K(57344K)] [ParOldGen: 152798K->152798K(172032K)] 181470K->181470K(229376K) [PSPermGen: 2606K->2606K(21248K)], 1.4479940 secs]
      ... (Several more like this)
      [Full GC [PSYoungGen: 28672K->28672K(57344K)] [ParOldGen: 152799K->152799K(172032K)] 181471K->181471K(229376K) [PSPermGen: 2606K->2606K(21248K)], 1.4439020 secs]
      ... (Several more like this)
      [Full GC [PSYoungGen: 28672K->28672K(57344K)] [ParOldGen: 152800K->152800K(172032K)] 181472K->181472K(229376K) [PSPermGen: 2606K->2606K(21248K)], 1.4459620 secs]
      ... (More like this)

      Each time ParOldGen grows by 1K. After a while, another pattern emerges:
      ...
      [Full GC [PSYoungGen: 28672K->28672K(57344K)] [ParOldGen: 152938K->152938K(172032K)] 181610K->181610K(229376K) [PSPermGen: 2606K->2606K(21248K)], 2.8846700 secs]
      [Full GC [PSYoungGen: 28672K->28672K(57344K)] [ParOldGen: 152808K->152808K(172032K)] 181480K->181480K(229376K) [PSPermGen: 2606K->2606K(21248K)], 2.8846070 secs]
      ... (Last two repeat for a while)

      Also, VM stops responding to Ctrl-\.

      This is only reproducible with -XX:+UseParallelOldGC. The test does not complete the iteration within 15 minutes. With only -XX:+UseParallelGC whole test completes within 30 seconds.

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              jcoomes John Coomes (Inactive)
              nhaustov Nicolay Haustov (Inactive)
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