[Bug 263765] panic: ffs_sync: modification on read-only filesystem

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263765

--- Comment #2 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #1)
Background fsck is enabled.

At the time of the panic, the filesystem is still mounted read-only. 
fs->fs_fmod is set to 1 because the corresponding fmod flag was set in the
on-disk superblock.  So, somehow a superblock with fs->fs_fmod = 1 was written
to disk, even though ffs_sbput() clears it, and after that the system always
panics during boot.

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