FileVault 2 reportedly on after completely turned off

[grahamperrin]

Cosmetic bug in 17A264c.

With the FileVault page of the Security & Privacy pane of System Preferences open during during reversion (converting (backward)) from Core Storage, after reversion completed, the pane stated:

FileVault is turned on for the disk "…".

Workaround

Unlock the pane.

Environment

MacBookPro8,2

/dev/disk1 on USB

sh-3.2$ date ; uptime ; sw_vers
Sun 11 Jun 2017 10:36:18 BST
10:36  up 15:46, 2 users, load averages: 1.14 0.89 0.71
ProductName:   Mac OS X
ProductVersion:   10.13
BuildVersion:   17A264c
sh-3.2$ diskutil coreStorage list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 56A20D1F-0F2F-42B1-A74C-7672D0811DAC
    =========================================================
    Name:         10.13
    Status:       Online
    Size:         665805369344 B (665.8 GB)
    Free Space:   1552384 B (1.6 MB)
    |
    +-< Physical Volume 856F1697-0BC9-4690-82CC-7DA01634B6D8
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s7
    |   Status:   Online
    |   Size:     665805369344 B (665.8 GB)
    |
    +-> Logical Volume Family 98B2D42D-2B77-42B2-B176-243CAA4FA342
        ----------------------------------------------------------
        Encryption Type:         AES-XTS
        Encryption Status:       Unlocked
        Conversion Status:       Complete
        Reversion State:         Reverting
        High Level Queries:      Not Fully Secure
        |                        Has Visible Users
        |                        Has Volume Key
        |
        +-> Logical Volume 448EF942-2AFC-441F-83E0-C83A24EC2C56
            ---------------------------------------------------
            Disk:                  disk2
            Status:                Online
            Size (Total):          665805369344 B (665.8 GB)
            Conversion Progress:   Complete
            Revertible:            No
            Revert Status:         PV to LV passthrough mode
            LV Name:               10.13
            Volume Name:           10.13
            Content Hint:          Apple_HFS
sh-3.2$ mount
/dev/disk2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
sh-3.2$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *160.0 GB   disk0
   1:                        EFI NO NAME                 104.9 MB   disk0s1
   2: 516E7CBA-6ECF-11D6-8FF8-00022D09712B               155.6 GB   disk0s2
   3:               FreeBSD Swap                         4.3 GB     disk0s3

/dev/disk1 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:                  Apple_HFS 10.12.5                 249.3 GB   disk1s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3
   4:                  Apple_HFS 10.9.5                  199.9 GB   disk1s4
   5:                 Apple_Boot Recovery HD             650.0 MB   disk1s5
   6:                  Apple_HFS Graham                  684.1 GB   disk1s6
   7:                  Apple_HFS 10.13                   665.8 GB   disk1s7
   8:                 Apple_Boot Recovery HD             650.0 MB   disk1s8

/dev/disk2 (external, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS 10.13                  +665.8 GB   disk2
                                 Logical Volume on disk1s7
                                 448EF942-2AFC-441F-83E0-C83A24EC2C56
                                 Unencrypted

sh-3.2$