[Bug 276944] no kernel panic after forcible unmount of /

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276944

--- Comment #2 from John F. Carr <jfc@mit.edu> ---
(In reply to Konstantin Belousov from comment #1)

There is code to panic when / is unmounted:

                if (ump->um_mountp == rootvnode->v_mount)
                        panic("UFS: root fs would be forcibly unmounted");

It didn't trigger on my system because the panic is only in 14.0 and newer. So
this bug report is a request to merge 60a41168d195cc09f7351c2c2bcafc389ed52406
to stable/13.

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