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  1. JDK
  2. JDK-8270532

Unexpected region node in IdealLoopTree::compute_trip_count

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      I found this while trying to reproduce another bug:

      # A fatal error has been detected by the Java Runtime Environment:
      #
      # Internal Error (/oracle/jdk/open/src/hotspot/share/opto/node.hpp:886), pid=183049, tid=183062
      # assert(is_Loop()) failed: invalid node class: Region
      #
      # JRE version: Java(TM) SE Runtime Environment (18.0) (fastdebug build 18-internal+0-2021-07-08-1412541.tobias...)
      # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 18-internal+0-2021-07-08-1412541.tobias..., mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
      # Problematic frame:
      # V [libjvm.so+0x12b5f14] IdealLoopTree::compute_trip_count(PhaseIdealLoop*)+0x34
      #
      # Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P %E" (or dumping to /oracle/jdk/open/core.183049)
      #
      # If you would like to submit a bug report, please visit:
      # https://bugreport.java.com/bugreport/crash.jsp
      #

      --------------- S U M M A R Y ------------

      Command Line: -XX:CompileCommand=dontinline,Test::method -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,Test::test Test

      Host: prometheus, Intel(R) Core(TM) i7-9850H CPU @ 2.60GHz, 12 cores, 31G, Ubuntu 20.04.2 LTS
      Time: Thu Jul 15 10:29:33 2021 CEST elapsed time: 0.395168 seconds (0d 0h 0m 0s)

      --------------- T H R E A D ---------------

      Current thread (0x00007f4a6c2e31d0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=183062, stack(0x00007f4a32f39000,0x00007f4a3303a000)]


      Current CompileTask:
      C2: 395 26 % ! 4 Test::test @ 20 (57 bytes)

      Stack: [0x00007f4a32f39000,0x00007f4a3303a000], sp=0x00007f4a33034340, free space=1004k
      Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
      V [libjvm.so+0x12b5f14] IdealLoopTree::compute_trip_count(PhaseIdealLoop*)+0x34
      V [libjvm.so+0x12ca73e] IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0xfe
      V [libjvm.so+0x12f6c98] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0xd58
      V [libjvm.so+0xa10cca] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2da
      V [libjvm.so+0xa0c676] Compile::Optimize()+0x586
      V [libjvm.so+0xa0f168] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, bool, DirectiveSet*)+0x1618
      V [libjvm.so+0x82c316] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x646
      V [libjvm.so+0xa1fbe9] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xef9
      V [libjvm.so+0xa20918] CompileBroker::compiler_thread_loop()+0x598
      V [libjvm.so+0x188af5c] JavaThread::thread_main_inner()+0x27c
      V [libjvm.so+0x1891700] Thread::call_run()+0x100
      V [libjvm.so+0x156f284] thread_native_entry(Thread*)+0x104

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              Assignee:
              jcm Jamsheed C M (Inactive)
              Reporter:
              thartmann Tobias Hartmann
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                Created:
                Updated:
                Resolved: