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  1. JDK
  2. JDK-8268019

C2: assert(no_dead_loop) failed: dead loop detected

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    • Subcomponent:
    • Resolved In Build:
      b09

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        Description

        The attached fuzzer test fails intermittently with the following assertion:

        To reproduce (fails 1 out of 5-6 times):
        $ java -Xcomp -XX:CompileOnly=Test -XX:-TieredCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+StressLCM -XX:+StressGCM -XX:+StressIGVN -XX:RepeatCompilation=100 Test.java

        #
        # A fatal error has been detected by the Java Runtime Environment:
        #
        # Internal Error (/opt/mach5/mesos/work_dir/slaves/3c846bae-ce30-4a97-93ee-9fef4497ccb6-S79226/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/0cb697b6-5006-4d18-afca-8f82d7082f5e/runs/5d51f3ad-e036-4803-805d-9e13517ddb05/workspace/open/src/hotspot/share/opto/phaseX.cpp:945), pid=19896, tid=19909
        # assert(no_dead_loop) failed: dead loop detected
        #
        # JRE version: Java(TM) SE Runtime Environment (17.0+25) (fastdebug build 17-ea+25-LTS-2214)
        # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 17-ea+25-LTS-2214, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
        # Problematic frame:
        # V [libjvm.so+0x15ef6e6] PhaseGVN::dead_loop_check(Node*) [clone .part.0]+0x156
        .............
        Command Line: -Xcomp -XX:CompileOnly=Test -XX:-TieredCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+StressLCM -XX:+StressGCM -XX:+StressIGVN -XX:RepeatCompilation=100 --add-modules=ALL-DEFAULT jdk.compiler/com.sun.tools.javac.launcher.Main Test.java
        .............
        Current thread (0x00007ff92c235ce0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=19909, stack(0x00007ff903cfd000,0x00007ff903dfe000)]


        Current CompileTask:
        C2: 3925 83 b Test::mainTest (577 bytes)

        Stack: [0x00007ff903cfd000,0x00007ff903dfe000], sp=0x00007ff903df9420, free space=1009k
        Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
        V [libjvm.so+0x15ef6e6] PhaseGVN::dead_loop_check(Node*) [clone .part.0]+0x156
        V [libjvm.so+0x15fdb29] PhaseIterGVN::transform_old(Node*)+0x609
        V [libjvm.so+0x15f63ae] PhaseIterGVN::optimize()+0x7e
        V [libjvm.so+0xa19106] Compile::Optimize()+0x216
        V [libjvm.so+0xa1bec5] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, DirectiveSet*)+0x1585
        V [libjvm.so+0x841aba] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1ea
        V [libjvm.so+0xa2c8e3] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x1013
        V [libjvm.so+0xa2d5f8] CompileBroker::compiler_thread_loop()+0x5a8
        V [libjvm.so+0x18a3a11] JavaThread::thread_main_inner()+0x271
        V [libjvm.so+0x18ab610] Thread::call_run()+0x100
        V [libjvm.so+0x157721e] thread_native_entry(Thread*)+0x10e

          Attachments

          1. FuzzerUtils.java
            13 kB
          2. hs_err_pid19896.log
            71 kB
          3. Test.java
            8 kB

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                Assignee:
                chagedorn Christian Hagedorn
                Reporter:
                chagedorn Christian Hagedorn
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                  Dates

                  Created:
                  Updated:
                  Resolved: