Index: sys/kern/vfs_syscalls.c
===================================================================
--- sys/kern/vfs_syscalls.c
+++ sys/kern/vfs_syscalls.c
@@ -130,7 +130,7 @@
 		    vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
 			save = curthread_pflags_set(TDP_SYNCIO);
 			vfs_periodic(mp, MNT_NOWAIT);
-			VFS_SYNC(mp, MNT_NOWAIT);
+			VFS_SYNC(mp, MNT_WAIT);
 			curthread_pflags_restore(save);
 			vn_finished_write(mp);
 		}