On Mon, Jan 12, 2026 at 07:11:21PM -0800, Bobby Eshleman wrote:
>From: Bobby Eshleman <bobbyeshleman@meta.com>
>
>Add tests that validate vsock sockets are resilient to deleting
>namespaces. The vsock sockets should still function normally.
>
>The function check_ns_delete_doesnt_break_connection() is added to
>re-use the step-by-step logic of 1) setup connections, 2) delete ns,
>3) check that the connections are still ok.
>
>Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
>---
>Changes in v13:
>- remove tests that change the mode after socket creation (this is not
> supported behavior now and the immutability property is tested in other
> tests)
>- remove "change_mode" behavior of
> check_ns_changes_dont_break_connection() and rename to
> check_ns_delete_doesnt_break_connection() because we only need to test
> namespace deletion (other tests confirm that the mode cannot change)
>
>Changes in v11:
>- remove pipefile (Stefano)
>
>Changes in v9:
>- more consistent shell style
>- clarify -u usage comment for pipefile
>---
> tools/testing/selftests/vsock/vmtest.sh | 84 +++++++++++++++++++++++++++++++++
> 1 file changed, 84 insertions(+)
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
>
>diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
>index a9eaf37bc31b..dc8dbe74a6d0 100755
>--- a/tools/testing/selftests/vsock/vmtest.sh
>+++ b/tools/testing/selftests/vsock/vmtest.sh
>@@ -68,6 +68,9 @@ readonly TEST_NAMES=(
> ns_same_local_loopback_ok
> ns_same_local_host_connect_to_local_vm_ok
> ns_same_local_vm_connect_to_local_host_ok
>+ ns_delete_vm_ok
>+ ns_delete_host_ok
>+ ns_delete_both_ok
> )
> readonly TEST_DESCS=(
> # vm_server_host_client
>@@ -135,6 +138,15 @@ readonly TEST_DESCS=(
>
> # ns_same_local_vm_connect_to_local_host_ok
> "Run vsock_test client in VM in a local ns with server in same ns."
>+
>+ # ns_delete_vm_ok
>+ "Check that deleting the VM's namespace does not break the socket connection"
>+
>+ # ns_delete_host_ok
>+ "Check that deleting the host's namespace does not break the socket connection"
>+
>+ # ns_delete_both_ok
>+ "Check that deleting the VM and host's namespaces does not break the socket connection"
> )
>
> readonly USE_SHARED_VM=(
>@@ -1287,6 +1299,78 @@ test_vm_loopback() {
> return "${KSFT_PASS}"
> }
>
>+check_ns_delete_doesnt_break_connection() {
>+ local pipefile pidfile outfile
>+ local ns0="global0"
>+ local ns1="global1"
>+ local port=12345
>+ local pids=()
>+ local rc=0
>+
>+ init_namespaces
>+
>+ pidfile="$(create_pidfile)"
>+ if ! vm_start "${pidfile}" "${ns0}"; then
>+ return "${KSFT_FAIL}"
>+ fi
>+ vm_wait_for_ssh "${ns0}"
>+
>+ outfile=$(mktemp)
>+ vm_ssh "${ns0}" -- \
>+ socat VSOCK-LISTEN:"${port}",fork STDOUT > "${outfile}" 2>/dev/null &
>+ pids+=($!)
>+ vm_wait_for_listener "${ns0}" "${port}" "vsock"
>+
>+ # We use a pipe here so that we can echo into the pipe instead of using
>+ # socat and a unix socket file. We just need a name for the pipe (not a
>+ # regular file) so use -u.
>+ pipefile=$(mktemp -u /tmp/vmtest_pipe_XXXX)
>+ ip netns exec "${ns1}" \
>+ socat PIPE:"${pipefile}" VSOCK-CONNECT:"${VSOCK_CID}":"${port}" &
>+ pids+=($!)
>+
>+ timeout "${WAIT_PERIOD}" \
>+ bash -c 'while [[ ! -e '"${pipefile}"' ]]; do sleep 1; done; exit 0'
>+
>+ if [[ "$1" == "vm" ]]; then
>+ ip netns del "${ns0}"
>+ elif [[ "$1" == "host" ]]; then
>+ ip netns del "${ns1}"
>+ elif [[ "$1" == "both" ]]; then
>+ ip netns del "${ns0}"
>+ ip netns del "${ns1}"
>+ fi
>+
>+ echo "TEST" > "${pipefile}"
>+
>+ timeout "${WAIT_PERIOD}" \
>+ bash -c 'while [[ ! -s '"${outfile}"' ]]; do sleep 1; done; exit 0'
>+
>+ if grep -q "TEST" "${outfile}"; then
>+ rc="${KSFT_PASS}"
>+ else
>+ rc="${KSFT_FAIL}"
>+ fi
>+
>+ terminate_pidfiles "${pidfile}"
>+ terminate_pids "${pids[@]}"
>+ rm -f "${outfile}" "${pipefile}"
>+
>+ return "${rc}"
>+}
>+
>+test_ns_delete_vm_ok() {
>+ check_ns_delete_doesnt_break_connection "vm"
>+}
>+
>+test_ns_delete_host_ok() {
>+ check_ns_delete_doesnt_break_connection "host"
>+}
>+
>+test_ns_delete_both_ok() {
>+ check_ns_delete_doesnt_break_connection "both"
>+}
>+
> shared_vm_test() {
> local tname
>
>
>--
>2.47.3
>