Error while stress testing

Hi,

I am using lastest version of mysql2 with following sequelize configuration

Node: v.4.4.1
mysql: v5.6.21
sequelize: v2.0.0-dev9
sequelize: configuration

var defaultOptions = {
        "host": default_config.host,
        "port": default_config.port,
        "dialectModulePath": 'mysql2',
        "dialect": "mysql",
        "define": {
            "timestamps": false,
            "freezeTableName": true,
            "syncOnAssociation": false
        },
        "pool": {
            "maxConnections": 10,
            "minConnections": 10,
            "maxIdleTime": 10000,
            "handleDisconnects": true
        },
        "logging": (default_config.logging == undefined ? function(x) { defaultLogger.trace(x); } : default_config.logging),
		"dialectOptions": { multipleStatements: true }
    };

after adding some stress + run test cases i am getting following error

Error message: write after end
Stack trace: Error: write after end
    at writeAfterEnd (_stream_writable.js:166:12)
    at Socket.Writable.write (_stream_writable.js:211:5)
    at Socket.write (net.js:642:40)
    at Connection.write (/project/node_modules/mysql2/lib/connection.js:224:15)
    at Connection.writePacket (/project/node_modules/mysql2/lib/connection.js:265:10)
    at Quit.start (/project/node_modules/mysql2/lib/commands/quit.js:21:14)
    at Quit.Command.execute (/project/node_modules/mysql2/lib/commands/command.js:39:20)
    at Connection.handlePacket (/project/node_modules/mysql2/lib/connection.js:417:28)
    at Connection.addCommand (/project/node_modules/mysql2/lib/connection.js:440:10)
    at Connection.end (/project/node_modules/mysql2/lib/connection.js:804:22)
    at module.exports.disconnect (/project/node_modules/sequelize/lib/dialects/mysql/connector-manager.js:265:12)
    at Object.pool.Pooling.Pool.destroy (/project/node_modules/sequelize/lib/dialects/mysql/connector-manager.js:137:22)
    at Object.me.destroy (/project/node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:149:13)
    at removeIdle (/project/node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:178:10)
    at Timer.listOnTimeout (timers.js:92:15)
Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:344:11)
    at ServerResponse.res.setHeader (/project/node_modules/connect/lib/patch.js:134:22)
    at ServerResponse.header (/project/node_modules/express/lib/response.js:719:10)
    at ServerResponse.send (/project/node_modules/express/lib/response.js:164:12)
    at done (/project/node_modules/express/lib/response.js:956:10)
    at View.exports.renderFile [as engine] (/project/node_modules/ejs/lib/ejs.js:318:3)
    at View.render (/project/node_modules/express/lib/view.js:126:8)
    at tryRender (/project/node_modules/express/lib/application.js:639:10)
    at EventEmitter.render (/project/node_modules/express/lib/application.js:591:3)
    at ServerResponse.render (/project/node_modules/express/lib/response.js:960:7)
    at /project/node_modules/express-partials/index.js:82:15
    at View.exports.renderFile [as engine] (/project/node_modules/ejs/lib/ejs.js:318:3)
    at View.render (/project/node_modules/express/lib/view.js:126:8)
    at tryRender (/project/node_modules/express/lib/application.js:639:10)
    at EventEmitter.render (/project/node_modules/express/lib/application.js:591:3)
    at ServerResponse.render (/project/node_modules/express/lib/response.js:960:7)
    at ServerResponse.res.render (/project/node_modules/express-partials/index.js:55:9)
    at Domain.<anonymous> (/project/config/express.js:53:23)
    at emitOne (events.js:77:13)
    at Domain.emit (events.js:169:7)
    at emitError (domain.js:66:24)
    at Domain.errorHandler [as _errorHandler] (domain.js:126:16)

Start by examining mysql2/lib/connection.js, mysql2/lib/commands/quit.js, and sequelize/lib/dialects/mysql/connector-manager.js at the stack-trace paths. Reproduce the failure with the stated Node, MySQL, Sequelize, mysql2, and pool configuration under stress, then determine whether the connection is being written to after shutdown and whether the resulting request sends more than one response.