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I am using packer to build an virtual machine on ESXI 6 host.

At some point the process halts and I can see several repetitions of the following message:

2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun

Here is my builder section of my packer template

"builders": [
   {
    "type": "vmware-iso",
    "format": "ova",
    "vmx_data": {
      "memsize": "8192",
      "numvcpus": "4",
      "ethernet0.networkName": "somelanName"
   },

And here is a previous section of the logs showing (default apparently) configuration related to serial0

2018-09-13T12:46:27.930Z| vmx| I120: DICT        serial0.autodetect = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT          serial0.filename = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT          serial0.filetype = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT     serial0.pipe.endpoint = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT           serial0.present = "FALSE"
2018-09-13T12:46:27.930Z| vmx| I120: DICT    serial0.startconnected = "FALSE"
2018-09-13T12:46:27.930Z| vmx| I120: DICT       serial0.trynorxloss = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT    serial0.yieldonmsrread = ""

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