[Bug 240539] tuntap: Getting "ifconfig: ioctl SIOCSIFNAME (set name): File exists" from `ifconfig tap create name tap0`

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240539

            Bug ID: 240539
           Summary: tuntap: Getting "ifconfig: ioctl SIOCSIFNAME (set
                    name): File exists" from `ifconfig tap create name
                    tap0`
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: 0mp at FreeBSD.org

Here's a sample shell session:

> # ifconfig | grep tap0
> # ifconfig tap create name tap0
> ifconfig: ioctl SIOCSIFNAME (set name): File exists
> tap0
> # ifconfig | grep tap0
> tap0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500

FWIW, I am getting unexpected system hangs requiring hard reset when I'm
destroying tap devices.

I am running FreeBSD 13.0-CURRENT r351819 GENERIC amd64.

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