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  1. JDK
  2. JDK-8193933

Export ClassLoaderData claim state to support interleaved object traversal

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    • Bug
    • Resolution: Fixed
    • P2
    • 10
    • 10
    • hotspot
    • None
    • 10
    • b40

    Backports

      Description

        We have a closed component that uses ClassLoaderDataGraph::clear_claimed_marks() to get a set of fresh claiming bits for object traversal.

        This interferes with the concurrent marking GCs, that are using this information to determine if a CLD has been marked through our not.

        The effect is that there's a possibility that some class loaders won't get marked and classes might be prematurely unloaded, which would lead to crashes.

        We probably would want to redesign the CLDG claiming, to allow multiple claim sets. But in the meantime, a work around could be that the closed component introduce a mechanism that will save and restore the original claim bits.

        In order to add this save/restore mechanism, we would need to publicly export the ClassLoaderData "claim" set of member functions.

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8195578 Export ClassLoaderData claim state to support interleaved object traversal

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

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8195929 Export ClassLoaderData claim state to support interleaved object traversal

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

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8197719 Export ClassLoaderData claim state to support interleaved object traversal

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

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8200989 Export ClassLoaderData claim state to support interleaved object traversal

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

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                mgronlun Markus Grönlund
                mgronlun Markus Grönlund
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                  Updated:
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