For Linux kernel patch:

  cf5fb87fcdaa ("netfilter: nf_tables: reject duplicate device on updates")

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 .../testcases/transactions/chain_update_dup   | 22 +++++++++++++++++++
 .../transactions/flowtable_update_dup         | 22 +++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100755 tests/shell/testcases/transactions/chain_update_dup
 create mode 100755 tests/shell/testcases/transactions/flowtable_update_dup

diff --git a/tests/shell/testcases/transactions/chain_update_dup b/tests/shell/testcases/transactions/chain_update_dup
new file mode 100755
index 000000000000..5d529dd157dc
--- /dev/null
+++ b/tests/shell/testcases/transactions/chain_update_dup
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+ip link add dummy0 type dummy
+
+$NFT -f /dev/stdin <<EOF
+table netdev t {
+	chain c {
+		type filter hook ingress priority 0;
+	}
+}
+EOF
+
+$NFT -f /dev/stdin <<EOF
+add chain netdev t c { devices = { dummy0 }; }
+add chain netdev t c { devices = { dummy0 }; }
+EOF
+
+ip link del dummy0
+
+sleep 4
+
+$NFT flush ruleset
diff --git a/tests/shell/testcases/transactions/flowtable_update_dup b/tests/shell/testcases/transactions/flowtable_update_dup
new file mode 100755
index 000000000000..434d8de5d5bc
--- /dev/null
+++ b/tests/shell/testcases/transactions/flowtable_update_dup
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+ip link add dummy0 type dummy
+
+$NFT -f /dev/stdin <<EOF
+table inet t {
+	flowtable f {
+		hook ingress priority 0;
+	}
+}
+EOF
+
+$NFT -f /dev/stdin <<EOF
+add flowtable inet t f { devices = { dummy0 }; }
+add flowtable inet t f { devices = { dummy0 }; }
+EOF
+
+ip link del dummy0
+
+sleep 4
+
+$NFT flush ruleset
-- 
2.47.3