[Bug 235152] panic on subsequent wlan0 down & destroy in rtsock_msg_mbuf() (with r343254)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235152

            Bug ID: 235152
           Summary: panic on subsequent wlan0 down & destroy in
                    rtsock_msg_mbuf() (with r343254)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: avos at freebsd.org

Created attachment 201356
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201356&action=edit
Panic backtrace

It's an RTL8821AU - driven by rtwn_usb(4) (however, I don't think this
matters);
after some scan testing (wlandebug scan) I've done:

ifconfig wlan0 down
[~1 second pause]
ifconfig wlan0 destroy

The panic backtrace / kdb was shown instantly after the last command.

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