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  1. JDK
  2. JDK-8256658

Shenandoah: Deadlock between nmethod_entry_barrier and concurrent code root evacuator

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    • Subcomponent:
      gc
    • Resolved In Build:
      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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              Assignee:
              zgu Zhengyu Gu
              Reporter:
              zgu Zhengyu Gu
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