fix various crashes-upon-exits

interface/src/Application.cpp

@@ -814,6 +814,7 @@ bool setupEssentials(int& argc, char** argv, bool runningMarkerExisted) {
     }
 
     // Tell the plugin manager about our statically linked plugins
+    DependencyManager::set<PluginManager>();
     auto pluginManager = PluginManager::getInstance();
     pluginManager->setInputPluginProvider([] { return getInputPlugins(); });
     pluginManager->setDisplayPluginProvider([] { return getDisplayPlugins(); });
@@ -1375,6 +1376,10 @@ Application::Application(int& argc, char** argv, QElapsedTimer& startupTimer, bo
     initializeRenderEngine();
     qCDebug(interfaceapp, "Initialized Render Engine.");
 
+    // Overlays need to exist before we set the ContextOverlayInterface dependency
+    _overlays.init(); // do this before scripts load
+    DependencyManager::set<ContextOverlayInterface>();
+
     // Initialize the user interface and menu system
     // Needs to happen AFTER the render engine initialization to access its configuration
     initializeUi();
@@ -1511,10 +1516,6 @@ Application::Application(int& argc, char** argv, QElapsedTimer& startupTimer, bo
     // allow you to move an entity around in your hand
     _entityEditSender.setPacketsPerSecond(3000); // super high!!
 
-    // Overlays need to exist before we set the ContextOverlayInterface dependency
-    _overlays.init(); // do this before scripts load
-    DependencyManager::set<ContextOverlayInterface>();
-
     // Make sure we don't time out during slow operations at startup
     updateHeartbeat();
 
@@ -2552,12 +2553,18 @@ Application::~Application() {
     _octreeProcessor.terminate();
     _entityEditSender.terminate();
 
+    if (auto steamClient = PluginManager::getInstance()->getSteamClientPlugin()) {
+        steamClient->shutdown();
+    }
+    DependencyManager::destroy<PluginManager>();
+
+    DependencyManager::destroy<CompositorHelper>(); // must be destroyed before the FramebufferCache
+
     DependencyManager::destroy<AvatarManager>();
     DependencyManager::destroy<AnimationCache>();
     DependencyManager::destroy<FramebufferCache>();
     DependencyManager::destroy<TextureCache>();
     DependencyManager::destroy<ModelCache>();
-    DependencyManager::destroy<GeometryCache>();
     DependencyManager::destroy<ScriptCache>();
     DependencyManager::destroy<SoundCache>();
     DependencyManager::destroy<OctreeStatsProvider>();
@@ -2567,10 +2574,6 @@ Application::~Application() {
     // remove the NodeList from the DependencyManager
     DependencyManager::destroy<NodeList>();
 
-    if (auto steamClient = PluginManager::getInstance()->getSteamClientPlugin()) {
-        steamClient->shutdown();
-    }
-
 #if 0
     ConnexionClient::getInstance().destroy();
 #endif
@@ -2890,6 +2893,7 @@ void Application::initializeUi() {
     auto compositorHelper = DependencyManager::get<CompositorHelper>();
     connect(compositorHelper.data(), &CompositorHelper::allowMouseCaptureChanged, this, [=] {
         if (isHMDMode()) {
+            auto compositorHelper = DependencyManager::get<CompositorHelper>(); // don't capture outer smartpointer
             showCursor(compositorHelper->getAllowMouseCapture() ?
                        Cursor::Manager::lookupIcon(_preferredCursor.get()) :
                        Cursor::Icon::SYSTEM);

interface/src/Application_render.cpp

@@ -139,7 +139,10 @@ void Application::paintGL() {
     frame->frameIndex = _renderFrameCount;
     frame->framebuffer = finalFramebuffer;
     frame->framebufferRecycler = [](const gpu::FramebufferPointer& framebuffer) {
-        DependencyManager::get<FramebufferCache>()->releaseFramebuffer(framebuffer);
+        auto frameBufferCache = DependencyManager::get<FramebufferCache>();
+        if (frameBufferCache) {
+            frameBufferCache->releaseFramebuffer(framebuffer);
+        }
     };
     // deliver final scene rendering commands to the display plugin
     {

interface/src/ui/ApplicationOverlay.cpp

@@ -50,6 +50,8 @@ ApplicationOverlay::~ApplicationOverlay() {
         geometryCache->releaseID(_magnifierBorder);
         geometryCache->releaseID(_qmlGeometryId);
     }
+
+    DependencyManager::destroy<GeometryCache>();
 }
 
 // Renders the overlays either to a texture or to the screen

libraries/networking/src/ResourceManager.cpp

@@ -39,8 +39,13 @@ ResourceManager::ResourceManager(bool atpSupportEnabled) : _atpSupportEnabled(at
 }
 
 ResourceManager::~ResourceManager() {
-    _thread.terminate();
+    if (_thread.isRunning()) {
-    _thread.wait();
+        _thread.quit();
+        static const auto MAX_RESOURCE_MANAGER_THREAD_QUITTING_TIME = 0.5 * MSECS_PER_SECOND;
+        if (!_thread.wait(MAX_RESOURCE_MANAGER_THREAD_QUITTING_TIME)) {
+            _thread.terminate();
+        }
+    }
 }
 
 void ResourceManager::setUrlPrefixOverride(const QString& prefix, const QString& replacement) {

libraries/plugins/src/plugins/PluginManager.cpp

@@ -40,9 +40,8 @@ void PluginManager::setInputPluginSettingsPersister(const InputPluginSettingsPer
     _inputSettingsPersister = persister;
 }
 
-PluginManager* PluginManager::getInstance() {
+PluginManagerPointer PluginManager::getInstance() {
-    static PluginManager _manager;
+    return DependencyManager::get<PluginManager>();
-    return &_manager;
 }
 
 QString getPluginNameFromMetaData(QJsonObject object) {

libraries/plugins/src/plugins/PluginManager.h

@@ -9,11 +9,17 @@
 
 #include <QObject>
 
+#include <DependencyManager.h>
+
 #include "Forward.h"
 
-class PluginManager : public QObject {
+
+class PluginManager;
+using PluginManagerPointer = QSharedPointer<PluginManager>;
+
+class PluginManager : public QObject, public Dependency {
 public:
-    static PluginManager* getInstance();
+    static PluginManagerPointer getInstance();
     PluginManager();
 
     const DisplayPluginList& getDisplayPlugins();