On 10.09.2019 13:30, christoph.goettschkes@microdoc.com wrote:

The runtime implementation of the ldc bytecodes has an ASSERT block, which does
some sanity checks after the constant has been resolved [1]. The checks include
loading the cached reference of the loaded constant using the
ConstantPool::cp_to_object_index() method. This can fail, if the type of the
loaded constant is not a reference, but a primitive type. This can happen on
32-bit ARM softfp, since double constants are loaded using the runtime
implementation on that platform (see [2]). If no other constants have been
loaded before and there are no cached references, using the
ConstantPool::cp_to_object_index() method crashes HotSpot with a SIGSEGV.
This is the backtrace of a slowdebug build:

#0 0x762f8886 in Array<unsigned short>::length (this=0x0) at src/hotspot/share/oops/array.hpp:106
#1 0x764a1e48 in Array<unsigned short>::index_of (this=0x0, x=@0x761bc9ee: 2) at src/hotspot/share/oops/array.hpp:111
#2 0x764a1b16 in Array<unsigned short>::find (this=0x0, x=@0x761bc9ee: 2) at src/hotspot/share/oops/array.hpp:123
#3 0x7649a7d8 in ConstantPool::cp_to_object_index (this=0x647df840, cp_index=2) at src/hotspot/share/oops/constantPool.cpp:418
#4 0x765e53e6 in InterpreterRuntime::resolve_ldc (thread=0x76017400, bytecode=Bytecodes::_ldc2_w) at src/hotspot/share/interpreter/interpreterRuntime.cpp:205
#5 0x73e5c804 in ?? ()

Sample application:

class Test {
    public static void main(String... args) {
        double x = 4.2;
    }
}

[1] http://hg.openjdk.java.net/jdk/jdk/file/3fee0e6b54f5/src/hotspot/share/interpreter/interpreterRuntime.cpp#l199
[2] http://hg.openjdk.java.net/jdk/jdk/file/3fee0e6b54f5/src/hotspot/cpu/arm/templateTable_arm.cpp#l475