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selftests/tc-testing: Test case exercising potential mirred redirect deadlock

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Add a test case that reproduces deadlock scenario where the user has
a drr qdisc attached to root and has a mirred action that redirects to
self on egress

Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20251210162255.1057663-2-jhs@mojatatu.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Victor Nogueira
2025-12-10 11:22:55 -05:00
committed by Paolo Abeni
parent 1d856251a0
commit 5cba412d6a
1 changed files with 46 additions and 0 deletions
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46
tools/testing/selftests/tc-testing/tc-tests/actions/mirred.json
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@@ -1052,5 +1052,51 @@
"$TC qdisc del dev $DEV1 ingress_block 21 clsact",
"$TC actions flush action mirred"
]
},
{
"id": "7eba",
"name": "Redirect multiport: dummy egress -> dummy egress (Loop)",
"category": [
"filter",
"mirred"
],
"plugins": {
"requires": [
"nsPlugin"
]
},
"setup": [
"$IP link set dev $DUMMY up || true",
"$IP addr add 10.10.10.10/24 dev $DUMMY || true",
"$TC qdisc add dev $DUMMY handle 1: root drr",
"$TC filter add dev $DUMMY parent 1: protocol ip prio 10 matchall action mirred egress redirect dev $DUMMY index 1"
],
"cmdUnderTest": "ping -c1 -W0.01 -I $DUMMY 10.10.10.1",
"expExitCode": "1",
"verifyCmd": "$TC -j -s actions get action mirred index 1",
"matchJSON": [
{
"total acts": 0
},
{
"actions": [
{
"order": 1,
"kind": "mirred",
"mirred_action": "redirect",
"direction": "egress",
"index": 1,
"stats": {
"packets": 1,
"overlimits": 1
},
"not_in_hw": true
}
]
}
],
"teardown": [
"$TC qdisc del dev $DUMMY root"
]
}
]