[Bug 185619] [VNET] Name conflict not checked when a child vnet goes away and returns its interface(s) back to the parent

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=185619

--- Comment #7 from Kristof Provost <kp@freebsd.org> ---
(In reply to c433li from comment #6)
IFNAMSIZ is 16. That means you have no more than 15 characters for an interface
name, so renaming the interface is also fraught, and also requires an
additional check for conflicts after the rename. Which would also require
correct lock handling (which is currently absent). This doesn't actually avoid
the problem it tries to avoid.

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