diff --git a/doc/api/cluster.markdown b/doc/api/cluster.markdown
index 2d48f24751..b82eb5700e 100644
--- a/doc/api/cluster.markdown
+++ b/doc/api/cluster.markdown
@@ -242,18 +242,6 @@ Example:
 
 Spawn a new worker process. This can only be called from the master process.
 
-## cluster.settings
-
-* {Object}
-  * `exec` {String} file path to worker file.  Default: `__filename`
-  * `args` {Array} string arguments passed to worker.
-    (Default=`process.argv.slice(2)`)
-  * `silent` {Boolean} whether or not to send output to parent's stdio.
-    (Default=`false`)
-
-All settings set by the `.setupMaster` is stored in this settings object.
-This object is not supposed to be change or set manually.
-
 ## cluster.disconnect([callback])
 
 * `callback` {Function} called when all workers are disconnected and handlers are closed
diff --git a/lib/fs.js b/lib/fs.js
index ae9cdf4c4d..51dfe56293 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -87,14 +87,14 @@ fs.Stats.prototype.isSocket = function() {
 };
 
 fs.exists = function(path, callback) {
-  binding.stat(path, function(err, stats) {
+  binding.stat(pathModule._makeLong(path), function(err, stats) {
     if (callback) callback(err ? false : true);
   });
 };
 
 fs.existsSync = function(path) {
   try {
-    binding.stat(path);
+    binding.stat(pathModule._makeLong(path));
     return true;
   } catch (e) {
     return false;
diff --git a/lib/http.js b/lib/http.js
index 01aa4ebde8..f7b2f786b6 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -1482,9 +1482,7 @@ ClientRequest.prototype.onSocket = function(socket) {
     parser.incoming = null;
     req.parser = parser;
 
-    parser.socket = socket;
     socket.parser = parser;
-    parser.incoming = null;
     socket._httpMessage = req;
 
     // Setup "drain" propogation.
diff --git a/src/node.cc b/src/node.cc
index 84792d9800..aa8548750c 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -2453,11 +2453,35 @@ static void ParseArgs(int argc, char **argv) {
 static Isolate* node_isolate = NULL;
 static volatile bool debugger_running = false;
 
+
+static uv_async_t dispatch_debug_messages_async;
+
+
+// Called from the main thread.
+static void DispatchDebugMessagesAsyncCallback(uv_async_t* handle, int status) {
+  v8::Debug::ProcessDebugMessages();
+}
+
+
+// Called from V8 Debug Agent TCP thread.
+static void DispatchMessagesDebugAgentCallback() {
+  uv_async_send(&dispatch_debug_messages_async);
+}
+
+
 static void EnableDebug(bool wait_connect) {
   // If we're called from another thread, make sure to enter the right
   // v8 isolate.
   node_isolate->Enter();
 
+  v8::Debug::SetDebugMessageDispatchHandler(DispatchMessagesDebugAgentCallback,
+                                            false);
+
+  uv_async_init(uv_default_loop(),
+                &dispatch_debug_messages_async,
+                DispatchDebugMessagesAsyncCallback);
+  uv_unref((uv_handle_t*) &dispatch_debug_messages_async);
+
   // Start the debug thread and it's associated TCP server on port 5858.
   bool r = v8::Debug::EnableAgent("node " NODE_VERSION,
                                   debug_port,
diff --git a/test/simple/test-regress-GH-3739.js b/test/simple/test-regress-GH-3739.js
new file mode 100644
index 0000000000..937068795a
--- /dev/null
+++ b/test/simple/test-regress-GH-3739.js
@@ -0,0 +1,66 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common.js'),
+    assert = require('assert'),
+    fs = require('fs'),
+    path = require('path');
+
+var dir = path.resolve(common.fixturesDir),
+    dirs = [];
+
+// Make a long path.
+for (var i = 0; i < 50; i++) {
+  dir = dir + '/123456790';
+  try {
+    fs.mkdirSync(dir, '0777');
+  } catch (e) {
+    if (e.code == 'EEXIST') {
+      // Ignore;
+    } else {
+      cleanup();
+      throw e;
+    }
+  }
+  dirs.push(dir);
+}
+
+// Test existsSync
+var r = fs.existsSync(dir);
+if (r !== true) {
+  cleanup();
+  throw new Error('fs.existsSync returned false');
+}
+
+// Text exists
+fs.exists(dir, function(r) {
+  cleanup();
+  if (r !== true) {
+    throw new Error('fs.exists reported false');
+  }
+});
+
+// Remove all created directories
+function cleanup() {
+  for (var i = dirs.length - 1; i >= 0; i--) {
+    fs.rmdirSync(dirs[i]);
+  }
+}