internal: various improvements to avoid crashes on exit

src/debug/Log.hpp

@@ -27,6 +27,7 @@ namespace Debug {
     inline int64_t*    disableTime   = nullptr;
     inline bool        disableStdout = false;
     inline bool        trace         = false;
+    inline bool        shuttingDown  = false;
 
     inline std::string rollingLog = ""; // rolling log contains the ROLLING_LOG_SIZE tail of the log
 
@@ -36,6 +37,9 @@ namespace Debug {
         if (level == TRACE && !trace)
             return;
 
+        if (shuttingDown)
+            return;
+
         std::string logMsg = "";
 
         switch (level) {