Cryptfs : Unexpected value for crypto key location

Phone: Samsung S9 Plus, 256Gb

OS: Lineage OS 17.1 (Android 10)

ROOT: TWRP 3.5

I installed Lineage OS 17.1 on a Samsung S9+. It's been working fine so far. However, when I encrypt the OS from the security menu, right after the screen goes black with the green android-like logo, the phone quickly reboots back to the non encrypted OS. Going again through the process does not help.

logcat shows:

--------- beginning of main

01-20 19:17:52.959 4019 4129 D vold : fdeEnable(3, *, 0)

01-20 19:17:52.960 4019 4129 D vold : !fscrypt_is_native, spawning fdeEnableInternal

01-20 19:17:52.960 4019 403 E Cryptfs : Unexpected value for crypto key location

01-20 19:17:52.961 4019 403 E Cryptfs : Cannot get size of block device

01-20 19:17:53.067 4019 403 W vold : Found symlink /proc/29802/cwd referencing /data/misc/keystore

01-20 19:17:53.067 4019 403 W vold : Found symlink /proc/29803/fd/7 referencing /data/vendor/gps/.lhd.lock

01-20 19:17:53.068 4019 403 W vold : Found symlink /proc/29803/fd/12 referencing /data/vendor/gps/.pipe.gpsd_to_lhd.to_server

01-20 19:17:53.068 4019 403 W vold : Found symlink /proc/29803/fd/14 referencing /data/vendor/gps/.pipe.gpsd_to_lhd.to_client

01-20 19:17:53.069 4019 403 W vold : Found symlink /proc/29804/fd/7 referencing /data/vendor/gps/.gpsd.lock

...

...

01-20 19:17:53.217 4019 403 W vold : Sending Killed to 32740

01-20 19:17:53.218 4019 403 W vold : Sending Killed to 32509

01-20 19:17:53.218 4019 403 W vold : Sending Killed to 32383

...

...

01-20 19:17:53.221 4019 403 E Cryptfs : Unexpected value for crypto key location

01-20 19:17:53.221 4019 403 E Cryptfs : Cannot get size of block device

--------- beginning of crash

I tried the steps given here on /data (/dev/block/sda25), but it did not do it for me either.

1. Any idea on how I can debug further Cryptfs : Unexpected value for crypto key location?


2. Is there a way to encrypt /data via the command line if this keeps failing?