umount modules before switch_root

src/cmd/init.rs

@@ -144,6 +144,9 @@ pub async fn run() {
         warn!("failed to copy {INIT_LOG} to system: {e}");
     }
 
+    if let Err(e) = nix::mount::umount2("/modules", nix::mount::MntFlags::MNT_DETACH) {
+        warn!("failed to umount /modules: {e}");
+    }
     retry(async || switch_root("/system").await).await;
 }