[Bug 225423] panic: softdep_deallocate_dependencies: dangling deps

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225423

--- Comment #19 from Kirk McKusick <mckusick at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #18)
If you unmount /dev you lose your console, /dev/null, /dev/zero, /dev/random,
etc. A system without these fails to work pretty quickly (as I discovered when
I created a jail and forgot to put a /dev in it). I expect a system running
with any local filesystem (e.g., UFS, ZFS, ext2fs) would crash and burn pretty
quickly if its access to disk was removed. Of course, in insecure mode (which
is what we run in by default) we allow root to scribble all over kernel memory
through /dev/kmem so unmounting /dev is no worse than that.

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