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[release-1.34] server: Fix network cleanup failures when NetNS path is empty #9471

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Merged
merged 1 commit into from
Sep 19, 2025
Merged

[release-1.34] server: Fix network cleanup failures when NetNS path is empty #9471

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21 changes: 20 additions & 1 deletion server/sandbox_network.go
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Original file line number Diff line number Diff line change
Expand Up @@ -195,7 +195,16 @@ func (s *Server) networkStop(ctx context.Context, sb *sandbox.Sandbox) error {
// to prevent IP leaks, but we'll mark the network as stopped regardless of the outcome.
netnsValid := true

if podNetwork.NetNS != "" {
if podNetwork.NetNS == "" {
// Network namespace path is unexpectedly empty. This can happen when:
// 1) infra container process died
// 2) namespace not properly initialized
// 3) namespace was already cleaned up
log.Warnf(ctx, "Network namespace path is empty for pod sandbox %s(%s), attempting CNI teardown with cached info",
sb.Name(), sb.ID())

netnsValid = false
} else {
if _, statErr := os.Stat(podNetwork.NetNS); statErr != nil {
// Network namespace file doesn't exist, but we should still attempt CNI teardown
log.Debugf(ctx, "Network namespace file %s does not exist for pod sandbox %s(%s), attempting CNI teardown with cached info",
Expand All @@ -214,6 +223,16 @@ func (s *Server) networkStop(ctx context.Context, sb *sandbox.Sandbox) error {

// Always attempt CNI teardown to prevent IP leaks, even if netns is invalid.
if err := s.config.CNIPlugin().TearDownPodWithContext(stopCtx, podNetwork); err != nil {
if !netnsValid {
// This is expected when the network namespace is missing/invalid.
log.Debugf(ctx, "CNI teardown failed due to missing/invalid network namespace for pod sandbox %s(%s): %v", sb.Name(), sb.ID(), err)

// Clean up CNI result files even when NetNS is invalid.
s.cleanupCNIResultFiles(ctx, sb.ID())

return sb.SetNetworkStopped(ctx, true)
}

log.Warnf(ctx, "Failed to destroy network for pod sandbox %s(%s): %v", sb.Name(), sb.ID(), err)

// If the network namespace exists but CNI teardown failed, try to clean it up.
Expand Down
19 changes: 1 addition & 18 deletions server/sandbox_stop_test.go
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Expand Up @@ -5,7 +5,6 @@ import (

. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
"go.uber.org/mock/gomock"
types "k8s.io/cri-api/pkg/apis/runtime/v1"
)

Expand All @@ -25,7 +24,7 @@ var _ = t.Describe("PodSandboxStatus", func() {
// Given
addContainerAndSandbox()
testSandbox.SetStopped(ctx, false)
Expect(testSandbox.SetNetworkStopped(ctx, false)).To(Succeed())
Expect(testSandbox.SetNetworkStopped(ctx, true)).To(Succeed())

// When
_, err := sut.StopPodSandbox(context.Background(),
Expand All @@ -45,22 +44,6 @@ var _ = t.Describe("PodSandboxStatus", func() {
Expect(err).ToNot(HaveOccurred())
})

It("should fail when container is not stopped", func() {
// Given
addContainerAndSandbox()
gomock.InOrder(
cniPluginMock.EXPECT().GetDefaultNetworkName().Return(""),
cniPluginMock.EXPECT().TearDownPodWithContext(gomock.Any(), gomock.Any()).Return(t.TestError),
)

// When
_, err := sut.StopPodSandbox(context.Background(),
&types.StopPodSandboxRequest{PodSandboxId: testSandbox.ID()})

// Then
Expect(err).To(HaveOccurred())
})

It("should fail with empty sandbox ID", func() {
// Given
// When
Expand Down
28 changes: 28 additions & 0 deletions test/network.bats
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Expand Up @@ -253,3 +253,31 @@ function check_networking() {
# Verify the pod is gone.
run ! crictl inspectp "$pod_id"
}

@test "pod deletion succeeds when NetNS path is missing" {
start_crio

pod_id=$(crictl runp "$TESTDATA"/sandbox_config.json)
ctr_id=$(crictl create "$pod_id" "$TESTDATA"/container_redis.json "$TESTDATA"/sandbox_config.json)
crictl start "$ctr_id"

crictl ps --id "$ctr_id" | grep Running

netns_path=$(crictl inspectp "$pod_id" | jq -r '.status.network.namespace_path')

# Simulating the scenario where infra container dies and NetNS becomes invalid
# by removing the network namespace file.
if [[ -n "$netns_path" && -f "$netns_path" ]]; then
rm -f "$netns_path"
fi

crictl stop "$ctr_id"
crictl rm "$ctr_id"

crictl stopp "$pod_id"

# Pod deletion should succeed even with missing NetNS
crictl rmp "$pod_id"

run ! crictl inspectp "$pod_id"
}
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