[Boost-users] segmentation fault using boost asio in linux.

15 May 2012

      Hi,

I am using Boost Asio and hitting a segmentation fault crash in ubuntu.
I don't have any issue when this is run in the windows.
it runs and after half an hour, it hits this crash.
Below is the code that starts from beginning to the place that the
segmentation fault happened.

The interesting part is that I use io_strand all over the code and I don't
see any thread-safety issue.
In the program I use 2 threads that run the worker io_servece.run().

I also put some printf in the HandleSend() just before the crash. i can see
that itr pointer is not valid even though m_pending_sends has one element in
the list that is supposed to be this itr pointer.

What could be wrong here?

Thanks a lot,
mustafa

06:49.20 [dbg] void Connection::HandleSend() itr size: 2869978912
m_pending_sends.size(): 1

void Connection::Start()
{
    m_stopped = false;

    m_start_time = boost::posix_time::second_clock::local_time();

    boost::system::error_code ec;
    boost::asio::ip::tcp::resolver resolver( m_hive->GetService() );
    boost::asio::ip::tcp::resolver::query query( m_host,
boost::lexical_cast< std::string >( m_port ) );
    boost::asio::ip::tcp::resolver::iterator endpointIterator =
resolver.resolve( query );

    Connect(endpointIterator);

    return;
}

void Connection::Connect(tcp::resolver::iterator endpoint_iter)
{
    LDBG_ << "void Connection::Connect()-1 symbol: " << m_symbol;

    if (endpoint_iter !=  boost::asio::ip::tcp::resolver::iterator()) {
        boost::asio::ip::tcp::endpoint endpoint = *endpoint_iter;
        m_socket.async_connect( endpoint, m_io_strand.wrap( boost::bind( 
&Connection::HandleConnect, shared_from_this(),
boost::asio::placeholders::error, endpoint_iter ) ) );
    }
    else
    {
        Stop();
    }
    return;
}

void Connection::HandleConnect( const boost::system::error_code & error,
boost::asio::ip::tcp::resolver::iterator endpoint_iterator )
{
    LDBG_ << "void Connection::HandleConnect()-1 symbol: " << m_symbol << "
error: " << error << " HasError " << HasError() << " m_hive->HasStopped() "
<< m_hive->HasStopped();
    if ( error || HasError() || m_hive->HasStopped() ) {
        StartError( error );
    }
    else {
        if ( m_socket.is_open() ) {
            OnConnect( m_path );
        }
        else {
            Connect(++endpoint_iterator);
        }
    }

    return;
}

void MyConnection::OnConnect( const std::string & host, uint16_t port, const
std::string & path )
{
    Recv();

    Send();
}

void Connection::Send()
{
    if (m_stopped)
      return;

    std::string str = "GET " + m_path + " HTTP/1.0\r\n\r\n";
    str += "Host: " + m_host + "\r\n";
    str += "Accept: */*\r\n";
    str += "Connection: keep-alive \r\n\r\n";

    std::vector< uint8_t > request;
    std::copy( str.begin(), str.end(), std::back_inserter( request ) );

    m_io_strand.post( boost::bind( &Connection::DispatchSend,
shared_from_this(), request ) );
    // start the heartbeat timer for the next send msg.
    StartTimerHeartbeat();

    return;
}

void Connection::DispatchSend( std::vector< uint8_t > buffer )
{
    bool should_start_send = m_pending_sends.empty();
    m_pending_sends.push_back( buffer );
    if ( should_start_send ) {
        StartSend();
    }

    return;
}

void Connection::HandleSend( const boost::system::error_code &  error,
std::list< std::vector< uint8_t > >::iterator itr )
{
    if ( error || HasError() || m_hive->HasStopped() ) {
        StartError( error );
    }
    else {
        OnSend( *itr );
        if ( !m_pending_sends.empty() ) {
            m_pending_sends.erase( itr );    <<<<<<<<====== Segmentation
Fault happens here
            StartSend();
        }
    }

    return;
}
void Connection::StartSend()
{
    if ( !m_pending_sends.empty() ) {
        boost::asio::async_write( m_socket, boost::asio::buffer( 
m_pending_sends.front() ), m_io_strand.wrap( boost::bind( 
&Connection::HandleSend, shared_from_this(), 
boost::asio::placeholders::error, m_pending_sends.begin() ) ) );
    }

    return;
}

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[Boost-users] segmentation fault using boost asio in linux.

mozdemir