diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 11a702065bab..507c43db2a46 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -326,7 +326,9 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
 			return &dev->nf_hooks_egress;
 	}
 #endif
-	WARN_ON_ONCE(1);
+	//WARN_ON_ONCE(1);
+	WARN_ONCE(dev, "dev_net(dev) == %p, net == %p, dev->name %s, drivername %s", dev_net(dev), net, dev->name, netdev_drivername(dev));
+	WARN_ONCE(!dev, "dev unset!");
 	return NULL;
 }