While activating external connection and removing the modem device same time results NetworkManager hung.

Solution Verified - Updated -

Issue

  • NetworkManager would activate an ipv4.method=auto on that device, getting an IP address after the restart, NM would try to assume an external connection. In the middle of activation, the modem connected again. It seems that it causes the device to be removed.
    The activation is hanging:

Environment

  • Red Hat Enterprise Linux(RHEL) 8
  • Red Hat Enterprise Linux(RHEL) 7
  • Wireless USB modems
  • NetworkManager

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