1 files changed, 31 insertions, 4 deletions
diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index a5535d4bcc..28b40543e9 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -2262,10 +2262,7 @@ void errorCallback(LLError::ELevel level, const std::string &error_string)
 // Callback for LLError::LLUserWarningMsg
 void errorHandler(const std::string& title_string, const std::string& message_string, S32 code)
 {
-    if (!message_string.empty())
-    {
-        OSMessageBox(message_string, title_string.empty() ? LLTrans::getString("MBFatalError") : title_string, OSMB_OK);
-    }
+    // message is going to hang viewer, create marker first
     switch (code)
     {
     case LLError::LLUserWarningMsg::ERROR_OTHER:
@@ -2273,6 +2270,10 @@ void errorHandler(const std::string& title_string, const std::string& message_st
         break;
     case LLError::LLUserWarningMsg::ERROR_BAD_ALLOC:
         LLAppViewer::instance()->createErrorMarker(LAST_EXEC_BAD_ALLOC);
+        // When system run out of memory and errorHandler gets called from a thread,
+        // main thread might keep going while OSMessageBox freezes the caller.
+        // Todo: handle it better, but for now disconnect to avoid making things worse
+        gDisconnected = true;
         break;
     case LLError::LLUserWarningMsg::ERROR_MISSING_FILES:
         LLAppViewer::instance()->createErrorMarker(LAST_EXEC_MISSING_FILES);
@@ -2280,6 +2281,10 @@ void errorHandler(const std::string& title_string, const std::string& message_st
     default:
         break;
     }
+    if (!message_string.empty())
+    {
+        OSMessageBox(message_string, title_string.empty() ? LLTrans::getString("MBFatalError") : title_string, OSMB_OK);
+    }
 }
 
 void LLAppViewer::initLoggingAndGetLastDuration()
@@ -5704,6 +5709,28 @@ void LLAppViewer::forceErrorThreadCrash()
     thread->start();
 }
 
+void LLAppViewer::forceExceptionThreadCrash()
+{
+    class LLCrashTestThread : public LLThread
+    {
+    public:
+
+        LLCrashTestThread() : LLThread("Crash logging test thread")
+        {
+        }
+
+        void run()
+        {
+            const std::string exception_text = "This is a deliberate exception in a thread";
+            throw std::runtime_error(exception_text);
+        }
+    };
+
+    LL_WARNS() << "This is a deliberate exception in a thread" << LL_ENDL;
+    LLCrashTestThread* thread = new LLCrashTestThread();
+    thread->start();
+}
+
 void LLAppViewer::initMainloopTimeout(std::string_view state, F32 secs)
 {
     if (!mMainloopTimeout)