[Bug 256511] UFS assertion failure when shutting down from single-user mode

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 15 Jun 2021 13:48:08 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256511

--- Comment #5 from Konstantin Belousov <kib@FreeBSD.org> ---
I do not think that the patch is entirely correct.  Imagine that we have rw/SU
mounted volume, which is updated.  Then, if namei fails, you would remove
SU structures from the ufsmount without a reason.  IMO the cleaning of the
um_softdep should only occur if we set it up in the previous MNT_UPDATE {}
block.

The problem with the inconsistent names for devfs before/after move  of devfs
to /dev is inherent. You might add something special-cased for e.g. updating
UFS-type volume mounted on /, where "from" mount option does not start with
'/'.  Anything more generic would probably break some cases.

Please put patch into the phabricator instead of attaching it to the bug
report.

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