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  1. JDK
  2. JDK-8223389

Shenandoah optimizations fail with assert(!phase->exceeding_node_budget())

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: 13
    • Fix Version/s: 13
    • Component/s: hotspot
    • Subcomponent:
    • Resolved In Build:
      b20
    • Verification:
      Not verified

      Description

      This seems to be perfectly reproducible with tier1_gc_shenandoah:

      # A fatal error has been detected by the Java Runtime Environment:
      #
      # Internal Error (/home/buildbot/worker/jdkX-linux/build/src/hotspot/share/opto/loopUnswitch.cpp:66), pid=2443, tid=2512
      # assert(!phase->exceeding_node_budget()) failed: sanity
      #
      # JRE version: OpenJDK Runtime Environment (13.0) (fastdebug build 13-testing+0-builds.shipilev.net-openjdk-jdk-b850-20190506-jdk-1319)
      # Java VM: OpenJDK 64-Bit Server VM (fastdebug 13-testing+0-builds.shipilev.net-openjdk-jdk-b850-20190506-jdk-1319, compiled mode, sharing, tiered, compressed oops, shenandoah gc, linux-amd64)
      # Problematic frame:
      # V [libjvm.so+0x117d45c] IdealLoopTree::policy_unswitching(PhaseIdealLoop*) const+0x1cc

      Bisection shows it started after JDK-8216137, and it probably means Shenandoah transform miscalculated the needs for nodes?

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              • Assignee:
                roland Roland Westrelin
                Reporter:
                shade Aleksey Shipilev
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                • Created:
                  Updated:
                  Resolved: