Segmentation violation while destroying io_context

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@igorpsoares commented on Sep 4, 2018, 7:18 PM UTC:

Hi, I am facing a segmentation violation on the destructor of a class that makes use of io_service. I am not sure whether this a bug within asio or if this is due to some misuse. I will be glad if someone have some advice on this.

Here is the exception Stack Trace:

Received signal: 11 - SIGSEGV. Segmentation violation
    Thread: AsyncHttp-165596 - 140612727699200
    Stack trace:
    /ArbeitClick/ACServer/scserver: boost::asio::detail::timer_queue_set::get_all_timers(boost::asio::detail::op_queue<boost::asio::detail::scheduler_operation>&)()+0x21
    /ArbeitClick/ACServer/scserver: boost::asio::detail::epoll_reactor::shutdown()()+0xdb
    /ArbeitClick/ACServer/scserver: boost::asio::detail::service_registry::shutdown_services()()+0x31
    /ArbeitClick/ACServer/scserver: boost::asio::execution_context::shutdown()()+0x1b
    /ArbeitClick/ACServer/scserver: boost::asio::execution_context::~execution_context()()+0x19
    /ArbeitClick/ACServer/scserver: boost::asio::io_context::~io_context()()+0x18
    /ArbeitClick/ACServer/scserver: arbeit::httpclient::HttpClient::~HttpClient()()+0x14d

The io service is defined on my header file like this: boost::asio::io_service ios;

On a method within the HttpClient class I start the thread like this: httpThread = std::thread(boost::bind(&boost::asio::io_service::run, &ios));

In order to make sure I can destroy the HttpClient instance we call a method that checks if the ios service is stopped, which is the following:

bool HttpClient::isStopped()
{
      return ios.stopped();
}

If the method above returns true I try to destroy the class instance. Here is the destructor:

HttpClient::~HttpClient()
{
	if (httpThread.joinable())
		httpThread.join();	//Waits until the service has stopped
}

The exception is raised once in a while. It is not raised every time I call the destructor, so I am not really sure what could be causing the segmentation violation.

This issue was moved by chriskohlhoff from boostorg/asio#143.