diff --git a/internal/p9/server.go b/internal/p9/server.go
index f26954f..59a1f23 100644
--- a/internal/p9/server.go
+++ b/internal/p9/server.go
@@ -1377,6 +1377,19 @@ func (s *Server) createSession(args []string) error {
 	return nil
 }
 
+// Shutdown kills all active sessions, triggering Close() on each core.
+func (s *Server) Shutdown() {
+	s.mu.Lock()
+	ids := make([]string, 0, len(s.sessions))
+	for id := range s.sessions {
+		ids = append(ids, id)
+	}
+	s.mu.Unlock()
+	for _, id := range ids {
+		s.killSession(id)
+	}
+}
+
 func (s *Server) killSession(id string) {
 	s.mu.Lock()
 	sess := s.sessions[id]
diff --git a/main.go b/main.go
index 9a61ec8..d41f7d8 100644
--- a/main.go
+++ b/main.go
@@ -160,6 +160,7 @@ func runServer(sockPath, pidPath string) {
 	<-sigChan
 
 	fmt.Println("shutting down")
+	srv.Shutdown()
 	if fuseCmd != nil {
 		exec.Command("fusermount", "-u", mnt).Run() //nolint:errcheck
 		fuseCmd.Wait()                               //nolint:errcheck