[Bug 298575] /dev/md disappears after using rsync on it

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=298575

            Bug ID: 298575
           Summary: /dev/md disappears after using rsync on it
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: nvass@gmx.com

Hi,

It seems that using rsync on an md device is causing some undetected kernel
corruption. The device disappears from /dev and once /dev/mdctl disappeared.

How to trigger:
root@lamp:~ # mdconfig -a -t swap -s 50M
md0
root@lamp:~ # rsync --inplace --devices /bin/tcsh /dev/md0
rsync: [receiver] open "/dev/md0" failed: Operation not supported (45)
rsync error: some files/attrs were not transferred (see previous errors) (code
23) at main.c(1359) [sender=3.4.1]
root@lamp:~ # mdconfig -l
md0 
root@lamp:~ # ls -l /dev/md0
ls: /dev/md0: No such file or directory

The same happens on FBSD-14.

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