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  1. JDK
  2. JDK-8223389

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

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    • b20
    • Not verified

        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?

              roland Roland Westrelin
              shade Aleksey Shipilev
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                Created:
                Updated:
                Resolved: