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Shenandoah: Deadlock between nmethod_entry_barrier and concurrent code root evacuator

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    • gc
    • b26

    Description

      Nightly tests revealed a deadlock after JDK-8256415.

      The new concurrent code root evacuating/updating task sets up EvacOOM scope on the top level. If OOM occurs and nmethod_entry_barrier holds per-nmethod lock, while concurrent code root evacuating/updating task tries to acquire the exact per-nmethod lock, we deadlock.

      The solution is to move EvacOOM scope under per-nmethod lock.

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          relates to

          Enhancement - null JDK-8256415 Shenandoah: Should evacuate/update codecache concurrently when class unloading is off

          • P3 - Major loss of function.
          • Resolved
          links to

          Commit Commit openjdk/jdk/5ad1e228

          Review Review openjdk/jdk/1352

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              zgu Zhengyu Gu
              zgu Zhengyu Gu
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