diff --git a/deps/v8/build/common.gypi b/deps/v8/build/common.gypi
index 1609197876..7f084b8c1d 100644
--- a/deps/v8/build/common.gypi
+++ b/deps/v8/build/common.gypi
@@ -239,6 +239,7 @@
           'WIN32',
         ],
         'msvs_configuration_attributes': {
+          'OutputDirectory': '<(DEPTH)\\build\\$(ConfigurationName)',
           'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
           'CharacterSet': '1',
         },
@@ -270,7 +271,7 @@
         'target_conditions': [
           ['_toolset=="host"', {
             'variables': {
-              'm32flag': '<!((echo | $(echo ${CXX_host:-$(which g++)}) -m32 -E - > /dev/null 2>&1) && echo "-m32" || true)',
+              'm32flag': '<!((echo | $(echo ${CXX_host:-$(which g++)}) -m32 -E - > /dev/null 2>&1) && echo -n "-m32" || true)',
             },
             'cflags': [ '<(m32flag)' ],
             'ldflags': [ '<(m32flag)' ],
@@ -280,7 +281,7 @@
           }],
           ['_toolset=="target"', {
             'variables': {
-              'm32flag': '<!((echo | $(echo ${CXX_target:-${CXX:-$(which g++)}}) -m32 -E - > /dev/null 2>&1) && echo "-m32" || true)',
+              'm32flag': '<!((echo | $(echo ${CXX_target:-${CXX:-$(which g++)}}) -m32 -E - > /dev/null 2>&1) && echo -n "-m32" || true)',
             },
             'cflags': [ '<(m32flag)' ],
             'ldflags': [ '<(m32flag)' ],
@@ -323,7 +324,7 @@
         },
         'conditions': [
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
-            'cflags': [ '-Wno-unused-parameter',
+            'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual' ],
           }],
         ],
@@ -332,6 +333,10 @@
         'conditions': [
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" \
             or OS=="android"', {
+            'cflags!': [
+              '-O2',
+              '-Os',
+            ],
             'cflags': [
               '-fdata-sections',
               '-ffunction-sections',
diff --git a/deps/v8/src/debug.cc b/deps/v8/src/debug.cc
index 543ce9f24d..ed70c6a8d9 100644
--- a/deps/v8/src/debug.cc
+++ b/deps/v8/src/debug.cc
@@ -892,16 +892,6 @@ void Debug::Iterate(ObjectVisitor* v) {
 }
 
 
-void Debug::PutValuesOnStackAndDie(int start,
-                                   Address c_entry_fp,
-                                   Address last_fp,
-                                   Address larger_fp,
-                                   int count,
-                                   int end) {
-  OS::Abort();
-}
-
-
 Object* Debug::Break(Arguments args) {
   Heap* heap = isolate_->heap();
   HandleScope scope(isolate_);
@@ -999,41 +989,17 @@ Object* Debug::Break(Arguments args) {
         it.Advance();
       }
 
-      // Catch the cases that would lead to crashes and capture
-      // - C entry FP at which to start stack crawl.
-      // - FP of the frame at which we plan to stop stepping out (last FP).
-      // - current FP that's larger than last FP.
-      // - Counter for the number of steps to step out.
-      if (it.done()) {
-        // We crawled the entire stack, never reaching last_fp_.
-        PutValuesOnStackAndDie(0xBEEEEEEE,
-                               frame->fp(),
-                               thread_local_.last_fp_,
-                               NULL,
-                               count,
-                               0xFEEEEEEE);
-      } else if (it.frame()->fp() != thread_local_.last_fp_) {
-        // We crawled over last_fp_, without getting a match.
-        PutValuesOnStackAndDie(0xBEEEEEEE,
-                               frame->fp(),
-                               thread_local_.last_fp_,
-                               it.frame()->fp(),
-                               count,
-                               0xFEEEEEEE);
+      // Check that we indeed found the frame we are looking for.
+      CHECK(!it.done() && (it.frame()->fp() == thread_local_.last_fp_));
+      if (step_count > 1) {
+        // Save old count and action to continue stepping after
+        // StepOut
+        thread_local_.queued_step_count_ = step_count - 1;
       }
 
-      // If we found original frame
-      if (it.frame()->fp() == thread_local_.last_fp_) {
-        if (step_count > 1) {
-          // Save old count and action to continue stepping after
-          // StepOut
-          thread_local_.queued_step_count_ = step_count - 1;
-        }
-
-        // Set up for StepOut to reach target frame
-        step_action = StepOut;
-        step_count = count;
-      }
+      // Set up for StepOut to reach target frame
+      step_action = StepOut;
+      step_count = count;
     }
 
     // Clear all current stepping setup.
diff --git a/deps/v8/src/debug.h b/deps/v8/src/debug.h
index d9c966c37f..2adbd24338 100644
--- a/deps/v8/src/debug.h
+++ b/deps/v8/src/debug.h
@@ -232,12 +232,6 @@ class Debug {
   void PreemptionWhileInDebugger();
   void Iterate(ObjectVisitor* v);
 
-  NO_INLINE(void PutValuesOnStackAndDie(int start,
-                                        Address c_entry_fp,
-                                        Address last_fp,
-                                        Address larger_fp,
-                                        int count,
-                                        int end));
   Object* Break(Arguments args);
   void SetBreakPoint(Handle<SharedFunctionInfo> shared,
                      Handle<Object> break_point_object,
diff --git a/deps/v8/src/execution.cc b/deps/v8/src/execution.cc
index 5618975673..40ed7de414 100644
--- a/deps/v8/src/execution.cc
+++ b/deps/v8/src/execution.cc
@@ -132,6 +132,12 @@ static Handle<Object> Invoke(bool is_construct,
         V8::FatalProcessOutOfMemory("JS", true);
       }
     }
+#ifdef ENABLE_DEBUGGER_SUPPORT
+    // Reset stepping state when script exits with uncaught exception.
+    if (isolate->debugger()->IsDebuggerActive()) {
+      isolate->debug()->ClearStepping();
+    }
+#endif  // ENABLE_DEBUGGER_SUPPORT
     return Handle<Object>();
   } else {
     isolate->clear_pending_message();
diff --git a/deps/v8/src/runtime.cc b/deps/v8/src/runtime.cc
index 199371fe46..de3a55e5d1 100644
--- a/deps/v8/src/runtime.cc
+++ b/deps/v8/src/runtime.cc
@@ -4842,21 +4842,28 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StoreArrayLiteralElement) {
 // Check whether debugger and is about to step into the callback that is passed
 // to a built-in function such as Array.forEach.
 RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugCallbackSupportsStepping) {
-  if (!isolate->IsDebuggerActive()) return isolate->heap()->false_value();
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  if (!isolate->IsDebuggerActive() || !isolate->debug()->StepInActive()) {
+    return isolate->heap()->false_value();
+  }
   CONVERT_ARG_CHECKED(Object, callback, 0);
   // We do not step into the callback if it's a builtin or not even a function.
   if (!callback->IsJSFunction() || JSFunction::cast(callback)->IsBuiltin()) {
     return isolate->heap()->false_value();
   }
   return isolate->heap()->true_value();
+#else
+  return isolate->heap()->false_value();
+#endif  // ENABLE_DEBUGGER_SUPPORT
 }
 
 
 // Set one shot breakpoints for the callback function that is passed to a
 // built-in function such as Array.forEach to enable stepping into the callback.
 RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPrepareStepInIfStepping) {
+#ifdef ENABLE_DEBUGGER_SUPPORT
   Debug* debug = isolate->debug();
-  if (!debug->IsStepping()) return NULL;
+  if (!debug->IsStepping()) return isolate->heap()->undefined_value();
   CONVERT_ARG_CHECKED(Object, callback, 0);
   HandleScope scope(isolate);
   Handle<SharedFunctionInfo> shared_info(JSFunction::cast(callback)->shared());
@@ -4865,7 +4872,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPrepareStepInIfStepping) {
   // again, we need to clear the step out at this point.
   debug->ClearStepOut();
   debug->FloodWithOneShot(shared_info);
-  return NULL;
+#endif  // ENABLE_DEBUGGER_SUPPORT
+  return isolate->heap()->undefined_value();
 }
 
 
diff --git a/deps/v8/src/version.cc b/deps/v8/src/version.cc
index bd350fe202..2243106e76 100644
--- a/deps/v8/src/version.cc
+++ b/deps/v8/src/version.cc
@@ -35,7 +35,7 @@
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     11
 #define BUILD_NUMBER      10
-#define PATCH_LEVEL       14
+#define PATCH_LEVEL       15
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
 #define IS_CANDIDATE_VERSION 0
diff --git a/deps/v8/test/cctest/test-debug.cc b/deps/v8/test/cctest/test-debug.cc
index e40f406c3c..166b762913 100644
--- a/deps/v8/test/cctest/test-debug.cc
+++ b/deps/v8/test/cctest/test-debug.cc
@@ -7350,4 +7350,47 @@ TEST(DebugBreakInline) {
 }
 
 
+static void DebugEventStepNext(v8::DebugEvent event,
+                               v8::Handle<v8::Object> exec_state,
+                               v8::Handle<v8::Object> event_data,
+                               v8::Handle<v8::Value> data) {
+  if (event == v8::Break) {
+    PrepareStep(StepNext);
+  }
+}
+
+
+static void RunScriptInANewCFrame(const char* source) {
+  v8::TryCatch try_catch;
+  CompileRun(source);
+  CHECK(try_catch.HasCaught());
+}
+
+
+TEST(Regress131642) {
+  // Bug description:
+  // When doing StepNext through the first script, the debugger is not reset
+  // after exiting through exception.  A flawed implementation enabling the
+  // debugger to step into Array.prototype.forEach breaks inside the callback
+  // for forEach in the second script under the assumption that we are in a
+  // recursive call.  In an attempt to step out, we crawl the stack using the
+  // recorded frame pointer from the first script and fail when not finding it
+  // on the stack.
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  v8::Debug::SetDebugEventListener(DebugEventStepNext);
+
+  // We step through the first script.  It exits through an exception.  We run
+  // this inside a new frame to record a different FP than the second script
+  // would expect.
+  const char* script_1 = "debugger; throw new Error();";
+  RunScriptInANewCFrame(script_1);
+
+  // The second script uses forEach.
+  const char* script_2 = "[0].forEach(function() { });";
+  CompileRun(script_2);
+
+  v8::Debug::SetDebugEventListener(NULL);
+}
+
 #endif  // ENABLE_DEBUGGER_SUPPORT