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  1. JDK
  2. JDK-6325682

VM lockup with -XX:+UseConcMarkSweepGC while loading classes with custom classloader

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Details

    • Bug
    • Resolution: Fixed
    • P2
    • 6
    • 6
    • hotspot
    • gc
    • beta
    • 6
    • b54
    • generic
    • generic
    • Verified

    Description

      While trying to develop a testcase for 5093520, I have come across a lock up which happens with -XX:+UseConcMarkSweepGC.

      How to reproduce:
      - unzip LoadUnloadGC2.zip to some directory
      - javac -cp . gc/gctests/LoadUnloadGC2/LoadUnloadGC2.java
        javac -cp . nsk/share/classload/TemplateClass.java
      - java -XX:+UseConcMarkSweepGC -XX:+TraceClassLoading -XX:+TraceClassUnloading -XX:+PrintGCDetails -cp . gc.gctests.LoadUnloadGC2.LoadUnloadGC2

      Run logs attached: dump_normal.log, pstack.log (pstack on locked up process).
      Fastdebug version dumps core instead of locking up, logs attached: dump.log, hs_err_pid6835.log.

      Without -XX:+UseConcMarkSweepGC, the test eventually OOMs, which is also a problem.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-5093520 objects being kept alive in perm gen and old gen when debugger attached

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-6319671 CMS should use Heap_lock for protecting heap resizing, instead of CMS token

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-6319688 Incorrect locking in CMSPermGen::mem_allocate()

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-6263371 SEGV in MarkFromRootsClosure::scanOopsInOop

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              ysr Y. Ramakrishna
              nhaustov Nicolay Haustov (Inactive)
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