3
将boost syslog添加到源代码中后，段错误出现在cpp-netlib库中。 我能够准备最小工作代码片段来重现问题。使用boost syslog和cpp-netlib时出现分段错误
#include <boost/network/protocol/http/client.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/sinks/syslog_backend.hpp>
#include <iostream>
using namespace boost::network;
using namespace boost::network::http;
namespace sinks = boost::log::sinks;
int main()
{
client::request request_("http://www.boost.org/");
client client_;
client::response response_ = client_.get(request_);
std::string body_ = body(response_);
std::cout << "body: " << body_;
using syslog_sinkT = sinks::synchronous_sink <sinks::syslog_backend>;
boost::shared_ptr <sinks::syslog_backend> backend = boost::make_shared <sinks::syslog_backend>();
boost::shared_ptr<syslog_sinkT> sink = boost::make_shared <syslog_sinkT> (backend);
}
当最后2行被注释时，分段错误消失，一切正常。
GDB栈跟踪（约，可能会发生变化）：在Ubuntu 14.04存在具有CPP-NETLIB 0.11.2和两个升压版本1_58_0和1_60_0
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xf7c29b40 (LWP 19874)]
0x00000000 in ??()
(gdb) where
#0 0x00000000 in ??()
#1 0x083c376c in boost::asio::detail::task_io_service_operation::complete (bytes_transferred=260, ec=..., owner=...,
this=0xf6900710)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/asio/detail/task_io_service_o$
eration.hpp:38
#2 boost::asio::detail::task_io_service::do_run_one (ec=..., this_thread=..., lock=..., this=<optimized out>)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/asio/detail/impl/task_io_serv$
ce.ipp:372
#3 boost::asio::detail::task_io_service::run (ec=..., this=0x84ea280)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/asio/detail/impl/task_io_serv$
ce.ipp:149
#4 boost::asio::io_service::run (this=0x84e9a94)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/asio/impl/io_service.ipp:59
#5 0x083b5766 in boost::_mfi::mf0<unsigned int, boost::asio::io_service>::operator() (p=<optimized out>, this=<optimized out>)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/bind/mem_fn_template.hpp:49
#6 boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> >::operator()<unsigned int, boost::_mfi::mf0<unsigned int, boost::a$
io::io_service>, boost::_bi::list0> (a=<synthetic pointer>, f=..., this=0x84ea94c)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/bind/bind.hpp:249
#7 boost::_bi::bind_t<unsigned int, boost::_mfi::mf0<unsigned int, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boo$
t::asio::io_service*> > >::operator() (this=0x84ea944)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/bind/bind.hpp:1222
#8 boost::detail::thread_data<boost::_bi::bind_t<unsigned int, boost::_mfi::mf0<unsigned int, boost::asio::io_service>, boost::_bi::$
ist1<boost::_bi::value<boost::asio::io_service*> > > >::run (this=0x84ea828)
at /home/kostidov/prj/third_party-master/boost/boost_1_60_0/__public__/v0/Linux-libc6/include/boost/thread/detail/thread.hpp:116
#9 0x0840a4f8 in boost::(anonymous namespace)::thread_proxy (param=0x84ea828) at libs/thread/src/pthread/thread.cpp:167
#10 0xf7de1f70 in start_thread() from /lib/i386-linux-gnu/libpthread.so.0
#11 0xf7d18bee in clone() from /lib/i386-linux-gnu/libc.so.6
问题。 Boost，cpp-netlib和我的应用程序都是用-std = C++ 11编译的。
注意1.在到达syslog_backend创建之前，cpp-netlib出现分段错误。只有最后2行的存在才能保证SIGSEGV的再现。
注意2.只能用syslog_backend进行复制。其他任何日志目标（文件，控制台）都可以正常工作。 我最好的想法是在静态变量初始化期间内部可能存在boost问题，但我没有证明这个版本。 有什么建议吗？
是不是Mac OS X上重现性提升1_57_0和苹果LLVM版本7.0.2（铛-700.1.81），坚韧 – cdovgal