gdb.txt

brother ~/Desktop/test$ gdb ./7.3.1rc1/bin/php
GNU gdb (Debian 8.2-1) 8.2
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Reading symbols from ./7.3.1rc1/bin/php...done.
(gdb) run ./reprod.php 
Starting program: /home/brother/Desktop/test/7.3.1rc1/bin/php ./reprod.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00005555559b54a9 in to_xml_object (type=0x7ffff5263d20, data=0x7ffff5273640, style=2, parent=0x5555565f5db0)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:1859
1859					if (prop) {GC_PROTECT_RECURSION(prop);}
(gdb) bt
#0  0x00005555559b54a9 in to_xml_object (type=0x7ffff5263d20, data=0x7ffff5273640, style=2, parent=0x5555565f5db0)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:1859
#1  0x00005555559ba4c2 in sdl_guess_convert_xml (enc=0x7ffff5263d20, data=0x7ffff5273640, style=2, 
    parent=0x5555565f5db0) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:3285
#2  0x00005555559afb3e in master_to_xml_int (encode=0x7ffff5263d20, data=0x7ffff5273640, style=2, 
    parent=0x5555565f5db0, check_class_map=1) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:502
#3  0x00005555559afb9b in master_to_xml (encode=0x7ffff5263d20, data=0x7ffff5273640, style=2, parent=0x5555565f5db0)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:513
#4  0x00005555559b49bc in model_to_xml_object (node=0x5555565f5db0, model=0x7ffff52811c0, object=0x7ffff5282480, 
    style=2, strict=1) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:1668
#5  0x00005555559b4ec1 in model_to_xml_object (node=0x5555565f5db0, model=0x7ffff5281188, object=0x7ffff5282480, 
    style=2, strict=1) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:1740
#6  0x00005555559b5830 in to_xml_object (type=0x7ffff5263c00, data=0x7ffff5282480, style=2, parent=0x5555565f5c80)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:1912
#7  0x00005555559ba4c2 in sdl_guess_convert_xml (enc=0x7ffff5263c00, data=0x7ffff5282480, style=2, 
    parent=0x5555565f5c80) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:3285
#8  0x00005555559afb3e in master_to_xml_int (encode=0x7ffff5263c00, data=0x7ffff5282480, style=2, 
    parent=0x5555565f5c80, check_class_map=1) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:502
#9  0x00005555559afb9b in master_to_xml (encode=0x7ffff5263c00, data=0x7ffff5282480, style=2, parent=0x5555565f5c80)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/php_encoding.c:513
#10 0x00005555559ac329 in serialize_zval (val=0x7ffff5282480, param=0x7ffff5201a40, 
    paramName=0x7ffff52823f0 "parameters", style=2, parent=0x5555565f5c80)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/soap.c:4418
#11 0x00005555559ac1b8 in serialize_parameter (param=0x7ffff5201a40, param_val=0x7ffff5282480, index=0, name=0x0, 
    style=2, parent=0x5555565f5c80) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/soap.c:4389
#12 0x00005555559ab9d1 in serialize_function_call (this_ptr=0x7ffff521f100, function=0x7ffff5263ae0, 
    function_name=0x0, uri=0x0, arguments=0x7ffff5282480, arg_count=1, version=1, soap_headers=0x0)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/soap.c:4251
#13 0x00005555559a588b in do_soap_call (execute_data=0x7ffff521f0e0, this_ptr=0x7ffff521f100, 
    function=0x7ffff527e6f8 "MyMethod", function_len=8, arg_count=1, real_args=0x7ffff5282480, 
    return_value=0x7fffffffa450, location=0x7ffff527ea00 "http://localhost:8080/test-service", soap_action=0x0, 
    call_uri=0x0, soap_headers=0x0, output_headers=0x0) at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/soap.c:2678
#14 0x00005555559a6986 in zim_SoapClient___call (execute_data=0x7ffff521f0e0, return_value=0x7fffffffa450)
    at /home/brother/Desktop/test/php-7.3.1RC1/ext/soap/soap.c:2899
#15 0x0000555555c114ae in ZEND_CALL_TRAMPOLINE_SPEC_HANDLER ()
    at /home/brother/Desktop/test/php-7.3.1RC1/Zend/zend_vm_execute.h:1996
#16 0x0000555555c75a3c in execute_ex (ex=0x7ffff521f030)
    at /home/brother/Desktop/test/php-7.3.1RC1/Zend/zend_vm_execute.h:55530
#17 0x0000555555c7aefd in zend_execute (op_array=0x7ffff5280300, return_value=0x0)
    at /home/brother/Desktop/test/php-7.3.1RC1/Zend/zend_vm_execute.h:60834
#18 0x0000555555baa22e in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /home/brother/Desktop/test/php-7.3.1RC1/Zend/zend.c:1568
#19 0x0000555555b19be3 in php_execute_script (primary_file=0x7fffffffdcd0)
    at /home/brother/Desktop/test/php-7.3.1RC1/main/main.c:2630
#20 0x0000555555c7d985 in do_cli (argc=2, argv=0x5555564ce0e0)
    at /home/brother/Desktop/test/php-7.3.1RC1/sapi/cli/php_cli.c:997
#21 0x0000555555c7e905 in main (argc=2, argv=0x5555564ce0e0)
    at /home/brother/Desktop/test/php-7.3.1RC1/sapi/cli/php_cli.c:1389

schema.wsdl

<?xml version="1.0" encoding="UTF-8" ?>
<definitions targetNamespace="urn:test"
   xmlns="http://schemas.xmlsoap.org/wsdl/"
   xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
   xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
   xmlns:test="urn:test"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <portType name="TestPortType">
      <operation name="MyMethod">
         <input message="test:MyMethodRequestMessage" />
         <output message="test:MyMethodResponseMessage" />
      </operation>
   </portType>

   <binding name="TestBinding" type="test:TestPortType">
      <operation name="MyMethod">
         <input><soap:body use="literal" /></input>
         <output><soap:body use="literal" /></output>
      </operation>
   </binding>

   <message name="MyMethodRequestMessage">
      <part name="parameters" element="test:MyMethodRequest" />
   </message>

   <message name="MyMethodResponseMessage">
      <part name="parameters" element="test:MyMethodResponse" />
   </message>

   <types>
      <schema targetNamespace="urn:test" xmlns="http://www.w3.org/2001/XMLSchema">

         <element name="MyMethodRequest">
            <complexType>
               <sequence>
                  <element name="parameter" type="test:MyMethodRequestObject" />
               </sequence>
            </complexType>
         </element>

         <element name="MyMethodResponse" />

         <complexType name="MyMethodRequestObject">
            <complexContent>
               <extension base="test:DynamicData" />
            </complexContent>
         </complexType>

         <complexType name="DynamicData" />

      </schema>
   </types>

   <service name="TestService">
      <port binding="test:TestBinding" name="TestPort">
         <soap:address location="http://localhost:8080/test-service" />
      </port>
   </service>

</definitions>

testfile.php

<?php
$client = new SoapClient(realpath(__DIR__ . '/schema.wsdl'), [
    'cache_wsdl' => WSDL_CACHE_NONE,
]);

$client->MyMethod([
    'parameter' => [],
]);