fix: prevent logger close recursion and unsafe writer closing

io.go

@@ -64,12 +64,18 @@ func (l *Logger) print(level LogLevel, m ...any) {
 	if l.level.n < level.n {
 		return
 	}
+	if len(l.writers) == 0 {
+		return
+	}
 
 	tb := getFullTraceback(0)
 	for _, writer := range l.writers {
+		if writer == nil {
+			continue
+		}
 		err := writer.Print(level, l.prefix, tb, m...)
 		if err != nil {
-			l.Error(err)
+			l.reportWriterError(err)
 		}
 	}
 }
@@ -80,12 +86,28 @@ func (l *Logger) println(level LogLevel, m ...any) {
 	if l.level.n < level.n {
 		return
 	}
+	if len(l.writers) == 0 {
+		return
+	}
 
 	tb := getFullTraceback(0)
+	messages := append(append(make([]any, 0, len(m)+1), m...), "\n")
 	for _, writer := range l.writers {
-		err := writer.Print(level, l.prefix, tb, append(m, "\n")...)
+		if writer == nil {
+			continue
+		}
+		err := writer.Print(level, l.prefix, tb, messages...)
 		if err != nil {
-			l.Error(err)
+			l.reportWriterError(err)
 		}
 	}
 }
+
+// reportWriterError writes internal writer failures directly to stderr to avoid
+// re-entering the same logger path that just failed.
+func (l *Logger) reportWriterError(err error) {
+	if err == nil {
+		return
+	}
+	_, _ = fmt.Fprintf(os.Stderr, "[%s] logger writer error: %v\n", l.prefix, err)
+}