diff --git a/src/plugins/platforms/wayland/qwaylanddisplay.cpp b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
index 82003a308c6..47b107e807f 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
@@ -172,9 +172,9 @@ void QWaylandDisplay::checkError() const
     int ecode = wl_display_get_error(mDisplay);
     if ((ecode == EPIPE || ecode == ECONNRESET)) {
         // special case this to provide a nicer error
-        qWarning("The Wayland connection broke. Did the Wayland compositor die?");
+        qFatal("The Wayland connection broke. Did the Wayland compositor die?");
     } else {
-        qErrnoWarning(ecode, "The Wayland connection experienced a fatal error");
+        qFatal("The Wayland connection experienced a fatal error: %s", strerror(ecode));
     }
 }
 
@@ -184,25 +184,16 @@ void QWaylandDisplay::flushRequests()
         wl_display_read_events(mDisplay);
     }
 
-    if (wl_display_dispatch_pending(mDisplay) < 0) {
+    if (wl_display_dispatch_pending(mDisplay) < 0)
         checkError();
-        exitWithError();
-    }
 
     wl_display_flush(mDisplay);
 }
 
 void QWaylandDisplay::blockingReadEvents()
 {
-    if (wl_display_dispatch(mDisplay) < 0) {
+    if (wl_display_dispatch(mDisplay) < 0)
         checkError();
-        exitWithError();
-    }
-}
-
-void QWaylandDisplay::exitWithError()
-{
-    ::exit(1);
 }
 
 wl_event_queue *QWaylandDisplay::createEventQueue()
@@ -231,10 +222,9 @@ void QWaylandDisplay::dispatchQueueWhile(wl_event_queue *queue, std::function<bo
         else
             wl_display_cancel_read(mDisplay);
 
-        if (wl_display_dispatch_queue_pending(mDisplay, queue) < 0) {
+        if (wl_display_dispatch_queue_pending(mDisplay, queue) < 0)
             checkError();
-            exitWithError();
-        }
+
         if (!condition())
             break;
     }
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay_p.h b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
index 6bf6abd5de3..ae8ec0ab8ef 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay_p.h
+++ b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
@@ -191,7 +191,6 @@ public slots:
 
 private:
     void waitForScreens();
-    void exitWithError();
     void checkError() const;
 
     void handleWaylandSync();
diff --git a/src/plugins/platforms/wayland/qwaylandintegration.cpp b/src/plugins/platforms/wayland/qwaylandintegration.cpp
index 97e0203cdc9..46bef2944fe 100644
--- a/src/plugins/platforms/wayland/qwaylandintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandintegration.cpp
@@ -301,11 +301,14 @@ QPlatformTheme *QWaylandIntegration::createPlatformTheme(const QString &name) co
     return GenericWaylandTheme::createUnixTheme(name);
 }
 
+// May be called from non-GUI threads
 QWaylandClientBufferIntegration *QWaylandIntegration::clientBufferIntegration() const
 {
-    if (!mClientBufferIntegrationInitialized)
+    // Do an inexpensive check first to avoid locking whenever possible
+    if (Q_UNLIKELY(!mClientBufferIntegrationInitialized))
         const_cast<QWaylandIntegration *>(this)->initializeClientBufferIntegration();
 
+    Q_ASSERT(mClientBufferIntegrationInitialized);
     return mClientBufferIntegration && mClientBufferIntegration->isValid() ? mClientBufferIntegration.data() : nullptr;
 }
 
@@ -325,9 +328,12 @@ QWaylandShellIntegration *QWaylandIntegration::shellIntegration() const
     return mShellIntegration.data();
 }
 
+// May be called from non-GUI threads
 void QWaylandIntegration::initializeClientBufferIntegration()
 {
-    mClientBufferIntegrationInitialized = true;
+    QMutexLocker lock(&mClientBufferInitLock);
+    if (mClientBufferIntegrationInitialized)
+        return;
 
     QString targetKey;
     bool disableHardwareIntegration = qEnvironmentVariableIsSet("QT_WAYLAND_DISABLE_HW_INTEGRATION");
@@ -345,17 +351,20 @@ void QWaylandIntegration::initializeClientBufferIntegration()
 
     if (targetKey.isEmpty()) {
         qWarning("Failed to determine what client buffer integration to use");
-        return;
+    } else {
+        QStringList keys = QWaylandClientBufferIntegrationFactory::keys();
+        if (keys.contains(targetKey)) {
+            mClientBufferIntegration.reset(QWaylandClientBufferIntegrationFactory::create(targetKey, QStringList()));
+        }
+        if (mClientBufferIntegration)
+            mClientBufferIntegration->initialize(mDisplay.data());
+        else
+            qWarning("Failed to load client buffer integration: %s\n", qPrintable(targetKey));
     }
 
-    QStringList keys = QWaylandClientBufferIntegrationFactory::keys();
-    if (keys.contains(targetKey)) {
-        mClientBufferIntegration.reset(QWaylandClientBufferIntegrationFactory::create(targetKey, QStringList()));
-    }
-    if (mClientBufferIntegration)
-        mClientBufferIntegration->initialize(mDisplay.data());
-    else
-        qWarning("Failed to load client buffer integration: %s\n", qPrintable(targetKey));
+    // This must be set last to make sure other threads don't use the
+    // integration before initialization is complete.
+    mClientBufferIntegrationInitialized = true;
 }
 
 void QWaylandIntegration::initializeServerBufferIntegration()
diff --git a/src/plugins/platforms/wayland/qwaylandintegration_p.h b/src/plugins/platforms/wayland/qwaylandintegration_p.h
index a5a3d7b6956..7c1cb978abe 100644
--- a/src/plugins/platforms/wayland/qwaylandintegration_p.h
+++ b/src/plugins/platforms/wayland/qwaylandintegration_p.h
@@ -54,6 +54,7 @@
 #include <QtWaylandClient/qtwaylandclientglobal.h>
 #include <qpa/qplatformintegration.h>
 #include <QtCore/QScopedPointer>
+#include <QtCore/QMutex>
 
 QT_BEGIN_NAMESPACE
 
@@ -148,6 +149,7 @@ private:
     QScopedPointer<QPlatformAccessibility> mAccessibility;
 #endif
     bool mFailed = false;
+    QMutex mClientBufferInitLock;
     bool mClientBufferIntegrationInitialized = false;
     bool mServerBufferIntegrationInitialized = false;
     bool mShellIntegrationInitialized = false;
diff --git a/src/plugins/platforms/wayland/qwaylandwindow.cpp b/src/plugins/platforms/wayland/qwaylandwindow.cpp
index 1d4315a395f..f82898bd22e 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindow.cpp
@@ -211,8 +211,11 @@ void QWaylandWindow::initWindow()
 void QWaylandWindow::initializeWlSurface()
 {
     Q_ASSERT(!isInitialized());
-    QWriteLocker lock(&mSurfaceLock);
-    init(mDisplay->createSurface(static_cast<QtWayland::wl_surface *>(this)));
+    {
+        QWriteLocker lock(&mSurfaceLock);
+        init(mDisplay->createSurface(static_cast<QtWayland::wl_surface *>(this)));
+    }
+    emit wlSurfaceCreated();
 }
 
 bool QWaylandWindow::shouldCreateShellSurface() const
@@ -248,6 +251,7 @@ void QWaylandWindow::reset(bool sendDestroyEvent)
     delete mSubSurfaceWindow;
     mSubSurfaceWindow = nullptr;
     if (isInitialized()) {
+        emit wlSurfaceDestroyed();
         QWriteLocker lock(&mSurfaceLock);
         destroy();
     }
diff --git a/src/plugins/platforms/wayland/qwaylandwindow_p.h b/src/plugins/platforms/wayland/qwaylandwindow_p.h
index ed4061f0eae..717709938c0 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwindow_p.h
@@ -201,6 +201,10 @@ public:
 public slots:
     void applyConfigure();
 
+signals:
+    void wlSurfaceCreated();
+    void wlSurfaceDestroyed();
+
 protected:
     void surface_enter(struct ::wl_output *output) override;
     void surface_leave(struct ::wl_output *output) override;
diff --git a/src/plugins/platforms/wayland/shared/qwaylandxkb.cpp b/src/plugins/platforms/wayland/shared/qwaylandxkb.cpp
index 3cfc4b074e5..2dff8a5b16d 100644
--- a/src/plugins/platforms/wayland/shared/qwaylandxkb.cpp
+++ b/src/plugins/platforms/wayland/shared/qwaylandxkb.cpp
@@ -376,7 +376,7 @@ QVector<xkb_keysym_t> QWaylandXkb::toKeysym(QKeyEvent *event)
             keysyms.append(XKB_KEY_KP_0 + (event->key() - Qt::Key_0));
         else
             keysyms.append(toKeysymFromTable(event->key()));
-    } else if (!event->text().isEmpty()) {
+    } else if (!event->text().isEmpty() && event->key() != Qt::Key_Return) {
         // From libxkbcommon keysym-utf.c:
         // "We allow to represent any UCS character in the range U-00000000 to
         // U-00FFFFFF by a keysym value in the range 0x01000000 to 0x01ffffff."