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  1. JDK
  2. JDK-8223391

Unsynchronized iteration of ClassLoaderDataGraph

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Details

    • Bug
    • Resolution: Fixed
    • P4
    • 13
    • 13
    • hotspot
    • b20

    Description

      At the start of concurrent marking G1 iterates over the CLDG, calling ClassLoaderDataGraph::clear_claimed_marks (classLoaderDataGraph.cpp:50).

      At the same time, when adding a new CLD, the CLDG may be changed in ClassLoaderDataGraph::add_to_graph().

      This interaction is unsynchronized completely, potentially causing crashes.

      So far we have not been able to pinpoint any crash to this issue though.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8223570 Shenandoah needs to acquire lock before CLDG::clear_claimed_marks

          • P1 - Blocks development and/or testing work, production could not run.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8224151 Test vmTestbase/nsk/sysdict/vm/stress/chain/chain007/chain007.java might hang with release binaries

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

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              coleenp Coleen Phillimore
              tschatzl Thomas Schatzl
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              Dates

                Created:
                Updated:
                Resolved: