diff --git a/src/common/iflytek_ai_assistant.cpp b/src/common/iflytek_ai_assistant.cpp
index c9f37ca7..a302a6d0 100644
--- a/src/common/iflytek_ai_assistant.cpp
+++ b/src/common/iflytek_ai_assistant.cpp
@@ -12,6 +12,7 @@
 #include <QDBusInterface>
 #include <QDebug>
 #include <QProcess>
+#include <QCoreApplication>
 #include <QStandardPaths>
 
 #include <QDBusInterface>
@@ -391,15 +392,28 @@ QString IflytekAiAssistant::errorString(CallStatus ret) const
     }
 }
 
+bool IflytekAiAssistant::appShuttingDown()
+{
+    // 主线程进入 ~QCoreApplication（closingDown）或应用已析构后，dtk6log/事件派发
+    // 处于 teardown 状态，后台线程再走日志或排队回调会崩溃（BUG-378881/378901）
+    QCoreApplication *app = QCoreApplication::instance();
+    return app == nullptr || app->closingDown();
+}
+
 IflytekAiAssistant::CallStatus IflytekAiAssistant::copilotInstalled(const QSharedPointer<QDBusInterface> &copilot)
 {
     QDBusReply<QString> version = copilot->call("version");
     if (version.isValid()) {
-        qInfo() << "current uos-ai version:" << version.value();
+        // 阻塞调用可能跨越整个应用退出过程（默认超时 25s），返回后须复查
+        if (!appShuttingDown()) {
+            qInfo() << "current uos-ai version:" << version.value();
+        }
         return Enable;
     }
 
-    qWarning() << "Query uos-ai installed faild! Maybe need install";
+    if (!appShuttingDown()) {
+        qWarning() << "Query uos-ai installed faild! Maybe need install";
+    }
     return NotInstalled;
 }
 
@@ -411,12 +425,16 @@ IflytekAiAssistant::CallStatus IflytekAiAssistant::isCopilotEnabled(const QShare
 {
     QDBusReply<bool> state = copilot->call("isCopilotEnabled");
     if (state.isValid()) {
-        qDebug() << "current uos-ai user exp state:" << state.value();
+        if (!appShuttingDown()) {
+            qDebug() << "current uos-ai user exp state:" << state.value();
+        }
         return state.value() ? Enable : NoUserAgreement;
     }
 
     // NOTE: Adapt old version, if dbus interface not valid, assume the user agreement agreed.
-    qWarning() << "Query uos-ai user exp state failed!" << state.error().message();
+    if (!appShuttingDown()) {
+        qWarning() << "Query uos-ai user exp state failed!" << state.error().message();
+    }
     return Enable;
 }
 
@@ -440,6 +458,10 @@ void IflytekAiAssistant::checkAiExists()
     static std::once_flag kAiFlag;
     std::call_once(kAiFlag, [this]() {
         QtConcurrent::run([this]() {
+            // 任务可能排队到应用退出期才被线程池执行
+            if (appShuttingDown()) {
+                return;
+            }
             // If call dbus interface success, the uos-ai backend process started.
             auto copilot = QSharedPointer<QDBusInterface>::create(kCopilotService, kCopilotPath, kCopilotInterface);
             CallStatus status = IflytekAiAssistant::copilotInstalled(copilot);
@@ -447,6 +469,12 @@ void IflytekAiAssistant::checkAiExists()
                 status = IflytekAiAssistant::isCopilotEnabled(copilot);
             }
 
+            // 阻塞 D-Bus 期间应用可能已进入析构（主线程卡在 ~QCoreApplication
+            // 的 QThreadPool::waitForDone 等本任务收尾），此时打日志/排队回调即崩溃
+            if (appShuttingDown()) {
+                return;
+            }
+
             qInfo() << QString("backend uos-ai status: %1(%2)").arg(Enable == status).arg(status);
 
             // call on non-gui thread, so queued connection.
diff --git a/src/common/iflytek_ai_assistant.h b/src/common/iflytek_ai_assistant.h
index c5355b0e..7519ede2 100644
--- a/src/common/iflytek_ai_assistant.h
+++ b/src/common/iflytek_ai_assistant.h
@@ -67,6 +67,9 @@ class IflytekAiAssistant : public QObject
     static CallStatus isCopilotEnabled(const QSharedPointer<QDBusInterface> &copilot);
     static CallStatus launchCopilotChat(const QSharedPointer<QDBusInterface> &copilot);
 
+    /// BUG-378881/378901: 应用 teardown 期间为 true，后台探测线程此时不得打日志/排队回调
+    static bool appShuttingDown();
+
     static QString copilotService();
 
     bool m_inited{false};
diff --git a/src/editor/editwrapper.cpp b/src/editor/editwrapper.cpp
index f406deb9..e511ab1e 100644
--- a/src/editor/editwrapper.cpp
+++ b/src/editor/editwrapper.cpp
@@ -195,6 +195,16 @@ EditWrapper::EditWrapper(Window *window, QWidget *parent)
 EditWrapper::~EditWrapper()
 {
     qDebug() << "EditWrapper destructor";
+    // 必须在 delete m_pTextEdit 之前清理 m_pWaringNotices，避免 DMessageManager
+    // 持有 m_pTextEdit 悬空指针导致 use-after-free（bug 378881）。
+    // 此前 bug 78042 的崩溃根因是 delete m_pWaringNotices 位于 m_pTextEdit 之后，
+    // DMessageManager 在处理消息移除时访问已释放的 m_pTextEdit；将删除顺序
+    // 调整为先 m_pWaringNotices 后 m_pTextEdit 即可同时避免两个问题。
+    if (m_pWaringNotices != nullptr) {
+        disconnect(m_pWaringNotices);
+        delete m_pWaringNotices;
+        m_pWaringNotices = nullptr;
+    }
     if (m_pTextEdit != nullptr) {
         qDebug() << "EditWrapper destructor, m_pTextEdit not nullptr";
         disconnect(m_pTextEdit);
@@ -207,12 +217,6 @@ EditWrapper::~EditWrapper()
         delete m_pBottomBar;
         m_pBottomBar = nullptr;
     }
-    //delete 之后，如果出现文件被修改，需要重新加载弹框，之后，点击标签关闭，闪退问题　78042 ut002764
-//    if (m_pWaringNotices != nullptr) {
-//    disconnect(m_pWaringNotices);
-//        delete m_pWaringNotices;
-//        m_pWaringNotices = nullptr;
-//    }
     qDebug() << "EditWrapper destructor exit";
 }