Index: if_tun.c
===================================================================
RCS file: /cvs/src/sys/net/if_tun.c,v
retrieving revision 1.231
diff -u -p -r1.231 if_tun.c
--- if_tun.c	9 Mar 2021 20:05:14 -0000	1.231
+++ if_tun.c	18 Jan 2022 12:04:26 -0000
@@ -815,13 +815,25 @@ put:
 int
 tunwrite(dev_t dev, struct uio *uio, int ioflag)
 {
-	return (tun_dev_write(dev, uio, ioflag, 0));
+	int rv;
+
+	KERNEL_UNLOCK();
+	rv = tun_dev_write(dev, uio, ioflag, 0);
+	KERNEL_LOCK();
+
+	return (rv);
 }
 
 int
 tapwrite(dev_t dev, struct uio *uio, int ioflag)
 {
-	return (tun_dev_write(dev, uio, ioflag, ETHER_ALIGN));
+	int rv;
+
+	KERNEL_UNLOCK();
+	rv = tun_dev_write(dev, uio, ioflag, ETHER_ALIGN);
+	KERNEL_LOCK();
+
+	return (rv);
 }
 
 int