与boost::property_tree XML解析器一起使用时，boost::协同程序库崩溃

我使用Simple Web Server库创建简单的Web服务，将XML转换为JSON，反之亦然。反过来，它使用了几个boost库以及其中的boost:：coroutine。对于XML<->JSON转换我使用boost:：property_tree库进行中间表示。这是代码：

#include <iostream>
#include <sstream>
#include <server_http.hpp>
#define BOOST_SPIRIT_THREADSAFE
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/xml_parser.hpp>
using namespace std;
using namespace boost::property_tree;
using HttpServer = SimpleWeb::Server<SimpleWeb::HTTP>;
int main()
{
HttpServer server(8080, 1);
server.resource["^/json_to_xml$"]["POST"] = [](auto& response, auto request) {
try
{
ptree pt;
read_json(request->content, pt);
ostringstream json, xml;
write_json(json, pt);
clog << "JSON request content:" << endl << json.str() << endl;
write_xml(xml, pt, xml_writer_make_settings<ptree::key_type>(' ', 1u));
clog << "XML response content:" << endl << xml.str() << endl;
response << "HTTP/1.1 200 OKrnContent-Length: " << xml.str().length() << "rnrn" << xml.str();
}
catch(const exception& e)
{
cerr << "Error:" << endl << e.what() << endl;
response << "HTTP/1.1 400 Bad RequestrnContent-Length: " << strlen(e.what()) << "rnrn" << e.what();
}
};
server.resource["^/xml_to_json$"]["POST"] = [](auto& response, auto request) {
try
{
ptree pt;
read_xml(request->content, pt, xml_parser::trim_whitespace | xml_parser::no_comments);
ostringstream xml, json;
write_xml(xml, pt, xml_writer_make_settings<ptree::key_type>(' ', 1u));
clog << "XML request content:" << endl << xml.str() << endl;
write_json(json, pt);
clog << "JSON response content: " << endl << json.str() << endl;
response << "HTTP/1.1 200 OKrnContent-Length: " << json.str().length() << "rnrn" << json.str();
}
catch(const exception& e)
{
cerr << "Error:" << endl << e.what() << endl;
response << "HTTP/1.1 400 Bad RequestrnContent-Length: " << strlen(e.what()) << "rnrn" << e.what();
}
};
server.start();
return 0;
}

JSON到XML的转换工作正常，但相反会导致程序崩溃。当我在服务器的回调中不使用boost:：property_tree的XML解析器时，程序运行良好。这是执行的结果。这是GDB回溯。最后是Valgrind输出。

boost库的使用版本为1.58.0，但最新版本1.61.0的结果相同。使用1.4.2版本的Simple Web Server。