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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256511

--- Comment #7 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=0455cc7104ec8e8dd54b3f44049112a5a8ca329c

commit 0455cc7104ec8e8dd54b3f44049112a5a8ca329c
Author:     Robert Wing <rew@FreeBSD.org>
AuthorDate: 2022-03-07 19:18:03 +0000
Commit:     Robert Wing <rew@FreeBSD.org>
CommitDate: 2022-03-07 19:48:44 +0000

    ffs_mount(): return early if namei() fails to lookup disk device

    With soft updates enabled, an INVARIANTS panic is hit in ffs_unmount().

    The problem occurs in ffs_mount() when upgrading a mount from ro->rw.
    During a mount update, the soft update code gets set up but doesn't get
    cleaned up if namei() fails when looking up the disk device.

    Avoid this scenario by looking up the disk device first and bail early
    if the namei() lookup fails.

    PR:             256511
    MFC After:      2 weeks
    Reviewed by:    mckusick, kib
    Differential Revision:  https://reviews.freebsd.org/D30870

 sys/ufs/ffs/ffs_vfsops.c | 148 +++++++++++++++++++++++------------------------
 1 file changed, 72 insertions(+), 76 deletions(-)

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