diff --git a/doc/api/process.markdown b/doc/api/process.markdown
index e59baa82e84..eac1d4e1e4f 100644
--- a/doc/api/process.markdown
+++ b/doc/api/process.markdown
@@ -226,7 +226,7 @@ Example of opening standard input and listening for both events:
 
     process.stdin.setEncoding('utf8');
 
-    process.stdin.on('readable', function(chunk) {
+    process.stdin.on('readable', function() {
       var chunk = process.stdin.read();
       if (chunk !== null) {
         process.stdout.write('data: ' + chunk);
diff --git a/lib/child_process.js b/lib/child_process.js
index f6062248565..c8e9e37605a 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -114,6 +114,9 @@ var handleConversion = {
 
   'net.Socket': {
     send: function(message, socket) {
+      if (!socket._handle)
+        return;
+
       // if the socket was created by net.Server
       if (socket.server) {
         // the slave should keep track of the socket
@@ -142,7 +145,8 @@ var handleConversion = {
 
     postSend: function(handle) {
       // Close the Socket handle after sending it
-      handle.close();
+      if (handle)
+        handle.close();
     },
 
     got: function(message, handle, emit) {
@@ -452,6 +456,11 @@ function setupChannel(target, channel) {
       // convert TCP object to native handle object
       handle = handleConversion[message.type].send.apply(target, arguments);
 
+      // If handle was sent twice, or it is impossible to get native handle
+      // out of it - just send a text without the handle.
+      if (!handle)
+        message = message.msg;
+
       // Update simultaneous accepts on Windows
       if (obj.simultaneousAccepts) {
         net._setSimultaneousAccepts(handle);
diff --git a/lib/crypto.js b/lib/crypto.js
index 2f8e2fa6ab0..464d5be57fe 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -701,8 +701,13 @@ function filterDuplicates(names) {
   // for example, 'sha1' instead of 'SHA1'.
   var ctx = {};
   names.forEach(function(name) {
-    if (/^[0-9A-Z\-]+$/.test(name)) name = name.toLowerCase();
-    ctx[name] = true;
+    var key = name;
+    if (/^[0-9A-Z\-]+$/.test(key)) key = key.toLowerCase();
+    if (!ctx.hasOwnProperty(key) || ctx[key] < name)
+      ctx[key] = name;
   });
-  return Object.getOwnPropertyNames(ctx).sort();
+
+  return Object.getOwnPropertyNames(ctx).map(function(key) {
+    return ctx[key];
+  }).sort();
 }
diff --git a/lib/timers.js b/lib/timers.js
index 644d4c301cc..183044a2a36 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -138,9 +138,15 @@ function listOnTimeout() {
         threw = false;
       } finally {
         if (threw) {
+          // We need to continue processing after domain error handling
+          // is complete, but not by using whatever domain was left over
+          // when the timeout threw its exception.
+          var oldDomain = process.domain;
+          process.domain = null;
           process.nextTick(function() {
             list[kOnTimeout]();
           });
+          process.domain = oldDomain;
         }
       }
     }
diff --git a/src/node.h b/src/node.h
index d1641f751e2..03cf155af1d 100644
--- a/src/node.h
+++ b/src/node.h
@@ -325,7 +325,7 @@ extern "C" NODE_EXTERN void node_module_register(void* mod);
 #ifdef _WIN32
 # define NODE_MODULE_EXPORT __declspec(dllexport)
 #else
-# define NODE_MODULE_EXPORT /* empty */
+# define NODE_MODULE_EXPORT __attribute__((visibility("default")))
 #endif
 
 #if defined(_MSC_VER)
diff --git a/test/simple/test-cluster-send-handle-twice.js b/test/simple/test-cluster-send-handle-twice.js
new file mode 100644
index 00000000000..3215eae79ed
--- /dev/null
+++ b/test/simple/test-cluster-send-handle-twice.js
@@ -0,0 +1,56 @@
+// 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.
+
+// Testing to send an handle twice to the parent process.
+
+var common = require('../common');
+var assert = require('assert');
+var cluster = require('cluster');
+var net = require('net');
+
+var workers = {
+  toStart: 1
+};
+
+if (cluster.isMaster) {
+  for (var i = 0; i < workers.toStart; ++i) {
+    var worker = cluster.fork();
+    worker.on('exit', function(code, signal) {
+      assert.equal(code, 0, 'Worker exited with an error code');
+      assert(!signal, 'Worker exited by a signal');
+    });
+  }
+} else {
+  var server = net.createServer(function(socket) {
+    process.send('send-handle-1', socket);
+    process.send('send-handle-2', socket);
+  });
+
+  server.listen(common.PORT, function() {
+    var client = net.connect({ host: 'localhost', port: common.PORT });
+    client.on('close', function() { cluster.worker.disconnect(); });
+    setTimeout(function() { client.end(); }, 50);
+  }).on('error', function(e) {
+    console.error(e);
+    assert(false, 'server.listen failed');
+    cluster.worker.disconnect();
+  });
+}
diff --git a/test/simple/test-crypto.js b/test/simple/test-crypto.js
index 39fc1216aae..e1b26821241 100644
--- a/test/simple/test-crypto.js
+++ b/test/simple/test-crypto.js
@@ -1008,6 +1008,8 @@ assert.notEqual(-1, crypto.getHashes().indexOf('sha1'));
 assert.notEqual(-1, crypto.getHashes().indexOf('sha'));
 assert.equal(-1, crypto.getHashes().indexOf('SHA1'));
 assert.equal(-1, crypto.getHashes().indexOf('SHA'));
+assert.notEqual(-1, crypto.getHashes().indexOf('RSA-SHA1'));
+assert.equal(-1, crypto.getHashes().indexOf('rsa-sha1'));
 assertSorted(crypto.getHashes());
 
 // Base64 padding regression test, see #4837.
diff --git a/test/simple/test-domain-exit-dispose-again.js b/test/simple/test-domain-exit-dispose-again.js
new file mode 100644
index 00000000000..22928f26045
--- /dev/null
+++ b/test/simple/test-domain-exit-dispose-again.js
@@ -0,0 +1,76 @@
+// 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');
+var assert = require('assert');
+var domain = require('domain');
+var disposalFailed = false;
+
+// no matter what happens, we should increment a 10 times.
+var a = 0;
+log();
+function log(){
+  console.log(a++, process.domain);
+  if (a < 10) setTimeout(log, 20);
+}
+
+var secondTimerRan = false;
+
+// in 50ms we'll throw an error.
+setTimeout(err, 50);
+setTimeout(secondTimer, 50);
+function err(){
+  var d = domain.create();
+  d.on('error', handle);
+  d.run(err2);
+
+  function err2() {
+    // this timeout should never be called, since the domain gets
+    // disposed when the error happens.
+    setTimeout(function() {
+      console.error('This should not happen.');
+      disposalFailed = true;
+      process.exit(1);
+    });
+
+    // this function doesn't exist, and throws an error as a result.
+    err3();
+  }
+
+  function handle(e) {
+    // this should clean up everything properly.
+    d.dispose();
+    console.error(e);
+    console.error('in handler', process.domain, process.domain === d);
+  }
+}
+
+function secondTimer() {
+  console.log('In second timer');
+  secondTimerRan = true;
+}
+
+process.on('exit', function() {
+  assert.equal(a, 10);
+  assert.equal(disposalFailed, false);
+  assert(secondTimerRan);
+  console.log('ok');
+});
diff --git a/test/simple/test-next-tick-domain.js b/test/simple/test-next-tick-domain.js
new file mode 100644
index 00000000000..16f77ed94d5
--- /dev/null
+++ b/test/simple/test-next-tick-domain.js
@@ -0,0 +1,29 @@
+// 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');
+var assert = require('assert');
+
+var origNextTick = process.nextTick;
+
+require('domain');
+
+assert.strictEqual(origNextTick, process.nextTick, 'Requiring domain should not change nextTick');