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  1. JDK
  2. JDK-8038222

Assembler::bsrl fails on assert when -UseCountLeadingZerosInstruction is used on CPU with LZCNT support

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    • Subcomponent:
    • Resolved In Build:
      b08
    • CPU:
      x86
    • OS:
      generic

      Backports

        Description

        Assembler::bsrl fails on assert when -UseCountLeadingZerosInstruction is used on CPU with LZCNT support:

        $JAVA_HOME/bin/java -XX:-UseCountLeadingZerosInstruction -Xcomp -server -XX:-TieredCompilation -version

        # To suppress the following error report, specify this argument
        # after -XX: or in .hotspotrc: SuppressErrorAt=/assembler_x86.cpp:1115
        #
        # A fatal error has been detected by the Java Runtime Environment:
        #
        # Internal Error (/opt/jprt/T/P1/171256.amurillo/s/hotspot/src/cpu/x86/vm/assembler_x86.cpp:1115), pid=1265, tid=2938628976
        # assert(!VM_Version::supports_lzcnt()) failed: encoding is treated as LZCNT
        #
        # JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-fastdebug-201403211712.amurillo.jdk9-hs-2014-03-21-b00)
        # Java VM: Java HotSpot(TM) Server VM (25.0-b62-fastdebug compiled mode linux-x86 )
        # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
        #
        # An error report file with more information is saved as:
        # /export/fzhinkin/test/hs_err_pid1265.log
        #
        # Compiler replay data is saved as:
        # /export/fzhinkin/test/replay_pid1265.log
        #
        # If you would like to submit a bug report, please visit:
        # http://bugreport.sun.com/bugreport/crash.jsp
        #
        --------------- T H R E A D ---------------

        Current thread (0xaf9f7c00): JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=1299, stack(0xaf1fe000,0xaf27f000)]

        Stack: [0xaf1fe000,0xaf27f000], sp=0xaf27c270, free space=504k
        Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
        V [libjvm.so+0xdeb745] VMError::report_and_die()+0x185
        V [libjvm.so+0x5ef238] report_vm_error(char const*, int, char const*, char const*)+0x68
        V [libjvm.so+0x31506d] Assembler::bsrl(RegisterImpl*, RegisterImpl*)+0x4d
        V [libjvm.so+0x1d50f8] countLeadingZerosI_bsrNode::emit(CodeBuffer&, PhaseRegAlloc*) const+0xe8
        V [libjvm.so+0x563cb1] Compile::scratch_emit_size(Node const*)+0x441
        V [libjvm.so+0xa88885] MachNode::size(PhaseRegAlloc*) const+0x55
        V [libjvm.so+0xbc62d9] Compile::shorten_branches(unsigned int*, int&, int&, int&)+0x2a9
        V [libjvm.so+0xbc6fa9] Compile::init_buffer(unsigned int*)+0x2b9
        V [libjvm.so+0xbce4b1] Compile::Output()+0x4a1
        V [libjvm.so+0x5701d1] Compile::Code_Gen()+0x431
        V [libjvm.so+0x57359d] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0x1a3d
        V [libjvm.so+0x45aa1b] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x2fb
        V [libjvm.so+0x580ce9] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xbf9
        V [libjvm.so+0x5824cd] CompileBroker::compiler_thread_loop()+0x61d
        V [libjvm.so+0xd648ff] compiler_thread_entry(JavaThread*, Thread*)+0x4f
        V [libjvm.so+0xd73024] JavaThread::thread_main_inner()+0x234
        V [libjvm.so+0xd733c4] JavaThread::run()+0x2e4
        V [libjvm.so+0xbaf419] java_start(Thread*)+0x119
        C [libpthread.so.0+0x6b39] start_thread+0xc9
        C [libc.so.6+0xe2d6e] clone+0x5e

        Issue could be reproduced with HotSpot build with JDK-8031321 fix.

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                Assignee:
                iveresov Igor Veresov
                Reporter:
                fzhinkin Filipp Zhinkin
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                  Created:
                  Updated:
                  Resolved: