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  1. JDK
  2. JDK-8235584

UseProfiledLoopPredicate fails with assert(_phase->get_loop(c) == loop) failed: have to be in the same loop


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    • Resolved In Build:



        Reverting the change in loopPredicate.cpp:1393 and running the regression test crashes the frequency computation code:

        # A fatal error has been detected by the Java Runtime Environment:
        # Internal Error (/oracle/jdk_jdk/open/src/hotspot/share/opto/loopPredicate.cpp:888), pid=18401, tid=18412
        # assert(_phase->get_loop(c) == loop) failed: have to be in the same loop
        # JRE version: Java(TM) SE Runtime Environment (14.0) (fastdebug build 14-internal+0-adhoc.tobias.open)
        # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 14-internal+0-adhoc.tobias.open, mixed mode, compressed oops, g1 gc, linux-amd64)
        # Problematic frame:
        # V [libjvm.so+0x116338b] PathFrequency::to(Node*)+0x9b
        # Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P" (or dumping to /home/tobias/Downloads/tmp2/tmp/core.18401)
        # 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: -Xbatch -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,Test::test -XX:+PrintCompilation -XX:-TieredCompilation -XX:+TraceLoopOpts -XX:+UseG1GC -XX:PrintIdealGraphFile=graph.xml -XX:+PrintIdealGraph -XX:PrintIdealGraphLevel=4 Test

        Host: prometheus, Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz, 8 cores, 15G, Ubuntu 18.04.3 LTS
        Time: Mon Dec 9 09:28:46 2019 CET elapsed time: 0 seconds (0d 0h 0m 0s)

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

        Current thread (0x00007fc3e03cf000): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=18412, stack(0x00007fc3ba8aa000,0x00007fc3ba9ab000)]

        Current CompileTask:
        C2: 696 29 % b Test::test @ 19 (49 bytes)

        Stack: [0x00007fc3ba8aa000,0x00007fc3ba9ab000], sp=0x00007fc3ba9a5080, free space=1004k
        Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
        V [libjvm.so+0x116338b] PathFrequency::to(Node*)+0x9b
        V [libjvm.so+0x115feb9] PhaseIdealLoop::loop_predication_impl(IdealLoopTree*) [clone .part.93]+0x999
        V [libjvm.so+0x11606ba] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x1ca
        V [libjvm.so+0x1198519] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0xfd9
        V [libjvm.so+0x978e41] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2c1
        V [libjvm.so+0x975cd8] Compile::Optimize()+0xa08
        V [libjvm.so+0x977565] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x1215
        V [libjvm.so+0x7e1140] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x110
        V [libjvm.so+0x9836db] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x2db
        V [libjvm.so+0x9846b8] CompileBroker::compiler_thread_loop()+0x4d8
        V [libjvm.so+0x16a8db6] JavaThread::thread_main_inner()+0x206
        V [libjvm.so+0x16adf16] Thread::call_run()+0xf6
        V [libjvm.so+0x13c955e] thread_native_entry(Thread*)+0x10e


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                • Assignee:
                  roland Roland Westrelin
                  thartmann Tobias Hartmann
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