TASK-194243 tune logging

Author: balupillai

src/lapi.c

@@ -1233,8 +1233,13 @@ LUA_API int lua_error (lua_State *L) {
   lua_lock(L);
   LUAI_TRY_BLOCK(L) {
     api_checknelems(L, 1);
-    if (!L->errorJmp) {
-      /* Use raw accessors (ttisstring/svalue) instead of the public API
+    if (!lj.previous) {
+      /* Log only when there is no outer error handler -- i.e. the error
+       * will ultimately reach the panic branch.  We check lj.previous
+       * (not L->errorJmp) because LUAI_TRY_BLOCK already set
+       * L->errorJmp = &lj, so L->errorJmp is always non-NULL here.
+       *
+       * Use raw accessors (ttisstring/svalue) instead of the public API
        * (lua_isstring/lua_tostring).  lua_isstring returns true for
        * numbers, and lua_tostring -> lua_tolstring calls lua_lock for
        * number-to-string conversion, which would deadlock since we