Eu tenho duas tarefas ansible da seguinte maneira

  tasks:
 - shell: ifconfig -a | sed 's/[ \t].*//;/^\(lo\|\)$/d'
   register: var1
 - debug: var=var1

 - shell: ethtool -i {{ item }} | grep bus-info | cut -b 16-22
   with_items: var1.stdout_lines
   register: var2
 - debug: var=var2

que é usado para obter uma lista de interfaces em uma máquina (linux) e obter o endereço de barramento para cada uma. Tenho mais uma tarefa, como segue no mesmo manual

 - name: Binding the interfaces
   shell: echo {{ item.item }}
   with_flattened: var2.results
   register: var3

que eu espero iterar sobre o valor de var2 e depois imprimir os números de barramento.

var2.results é o seguinte

"var2": {
    "changed": true,
    "msg": "All items completed",
    "results": [
        {
            "changed": true,
            "cmd": "ethtool -i br0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005778",
            "end": "2015-04-14 20:29:47.122203",
            "invocation": {
                "module_args": "ethtool -i br0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "br0:",
            "rc": 0,
            "start": "2015-04-14 20:29:47.116425",
            "stderr": "",
            "stdout": "",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp13s0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005862",
            "end": "2015-04-14 20:29:47.359749",
            "invocation": {
                "module_args": "ethtool -i enp13s0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp13s0:",
            "rc": 0,
            "start": "2015-04-14 20:29:47.353887",
            "stderr": "",
            "stdout": "0d:00.0",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp14s0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005805",
            "end": "2015-04-14 20:29:47.576674",
            "invocation": {
                "module_args": "ethtool -i enp14s0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp14s0:",
            "rc": 0,
            "start": "2015-04-14 20:29:47.570869",
            "stderr": "",
            "stdout": "0e:00.0",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp15s0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005873",
            "end": "2015-04-14 20:29:47.875058",
            "invocation": {
                "module_args": "ethtool -i enp15s0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp15s0:",
            "rc": 0,
            "start": "2015-04-14 20:29:47.869185",
            "stderr": "",
            "stdout": "0f:00.0",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp5s0f1: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005870",
            "end": "2015-04-14 20:29:48.112027",
            "invocation": {
                "module_args": "ethtool -i enp5s0f1: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp5s0f1:",
            "rc": 0,
            "start": "2015-04-14 20:29:48.106157",
            "stderr": "",
            "stdout": "05:00.1",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp5s0f2: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005863",
            "end": "2015-04-14 20:29:48.355733",
            "invocation": {
                "module_args": "ethtool -i enp5s0f2: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp5s0f2:",
            "rc": 0,
            "start": "2015-04-14 20:29:48.349870",
            "stderr": "",
            "stdout": "05:00.2",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp5s0f3: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005829",
            "end": "2015-04-14 20:29:48.591244",
            "invocation": {
                "module_args": "ethtool -i enp5s0f3: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp5s0f3:",
            "rc": 0,
            "start": "2015-04-14 20:29:48.585415",
            "stderr": "",
            "stdout": "05:00.3",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp9s0f0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005943",
            "end": "2015-04-14 20:29:48.910992",
            "invocation": {
                "module_args": "ethtool -i enp9s0f0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp9s0f0:",
            "rc": 0,
            "start": "2015-04-14 20:29:48.905049",
            "stderr": "",
            "stdout": "09:00.0",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i enp9s0f1: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005863",
            "end": "2015-04-14 20:29:49.143706",
            "invocation": {
                "module_args": "ethtool -i enp9s0f1: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "enp9s0f1:",
            "rc": 0,
            "start": "2015-04-14 20:29:49.137843",
            "stderr": "",
            "stdout": "09:00.1",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i lo: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005856",
            "end": "2015-04-14 20:29:49.386044",
            "invocation": {
                "module_args": "ethtool -i lo: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "lo:",
            "rc": 0,
            "start": "2015-04-14 20:29:49.380188",
            "stderr": "Cannot get driver information: Operation not supported",
            "stdout": "",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i virbr0: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.005859",
            "end": "2015-04-14 20:29:49.632356",
            "invocation": {
                "module_args": "ethtool -i virbr0: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "virbr0:",
            "rc": 0,
            "start": "2015-04-14 20:29:49.626497",
            "stderr": "",
            "stdout": "",
            "warnings": []
        },
        {
            "changed": true,
            "cmd": "ethtool -i virbr0-nic: | grep bus-info | cut -b 16-22",
            "delta": "0:00:00.024850",
            "end": "2015-04-14 20:29:49.901539",
            "invocation": {
                "module_args": "ethtool -i virbr0-nic: | grep bus-info | cut -b 16-22",
                "module_name": "shell"
            },
            "item": "virbr0-nic:",
            "rc": 0,
            "start": "2015-04-14 20:29:49.876689",
            "stderr": "",
            "stdout": "",
            "warnings": []
        }
    ]

Meu objetivo é obter o valor de stdout em cada item acima, por exemplo ("stdout": "09: 00.0"). Eu tentei dar algo como

     - name: Binding the interfaces
       shell: echo {{ item.item.stdout}}
       with_flattened: var2.results
#       with_indexed_items: var2.results
       register: var3

Mas isso não está fornecendo os valores de barramento no stdout corretamente. Agradeço a ajuda na listagem da variável do valor da variável na tarefa, conforme indicado abaixo quando a segunda variável estiver e a lista indexada. Estou tentando evitar a numeração direta de índices, como o item [0], porque o número de interfaces é dinâmico e a indexação direta pode resultar em resultados inesperados.

obrigado