Fixed broken stacktrace behaviour

src/loggers.jl

@@ -333,13 +333,13 @@ method with a `@sync` in order to synchronize all handler tasks.
 * `args::Dict`: a dict of msg fields and values that should be passed to `logger.record`.
 """
 function log(logger::Logger, rec::Record)
-    @sync for l in reverse!(getpath(logger))
+    for l in reverse!(getpath(logger))
         # If none of the `Filter`s return false we're good to log our record.
         !all(f -> f(rec), getfilters(l)) && break
 
         # Log to all of our handlers
         for (name, handler) in l.handlers
-            @async log(handler, rec)
+            log(handler, rec)
         end
 
         # Break if this is the root logger or it's non-propagating

test/loggers.jl

@@ -202,4 +202,34 @@
         Memento.config("notice"; recursive=true)
         @test all(l -> getlevel(l) == "notice", values(Memento._loggers))
     end
+
+    @testset "Stacktraces" begin
+        io = IOBuffer()
+
+        try
+            handler = DefaultHandler(
+                io,
+                DefaultFormatter(string(FMT_STR, " | {stacktrace}"))
+            )
+
+            logger = Logger(
+                "Logger.example",
+                Dict("Buffer" => handler),
+                "info",
+                LEVELS,
+                DefaultRecord,
+                true
+            )
+
+            # Define a test function that logs a message
+            test_func() = info(logger, "Hello")
+            test_func()
+
+            msg = String(take!(io))
+            @test !isempty(msg)
+            @test occursin("test_func", msg)
+        finally
+            close(io)
+        end
+    end
 end