【发布时间】：2016-01-28 00:28:56
【问题描述】：
将 boost syslog 添加到源代码后，cpp-netlib 库中出现分段错误。 我能够准备最小的工作代码 sn-p 来重现问题。
#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);
}
当最后两行被注释时，分段错误消失，一切正常。
gdb 堆栈跟踪（大约，可能会有所不同）：
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
使用 cpp-netlib 0.11.2 和 boost 版本 1_58_0 和 1_60_0 的 Ubuntu 14.04 上存在问题。 Boost、cpp-netlib 和我的应用程序是使用 -std=c++11 编译的。
注意 1. 在创建 syslog_backend 之前，cpp-netlib 中会出现分段错误。只有最后 2 行的存在才能保证 SIGSEGV 的复制。
注 2. 仅使用 syslog_backend 进行复制。任何其他日志记录目标（文件、控制台）都可以正常工作。 我最好的想法是问题可能在静态变量初始化期间出现在 boost 内部，但我没有关于这个版本的证明。 有什么建议吗？
【问题讨论】：
-
在带有 boost 1_57_0 和 Apple LLVM 版本 7.0.2 (clang-700.1.81) 的 Mac OS X 上无法重现，很难
标签： boost segmentation-fault syslog boost-log cpp-netlib