A custom kernel for a system with LUKS

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I built a custom kernel from 4.16.8 following the requirements here and enabled in-kernel options for all mentioned drivers, file systems, devices and algorithms from that page. But when I boot that kernel, it stops dead at "Starting to forward password requests to Plymouth".

The full kernel config is at https://pastebin.com/bBr1Mczc

In short, ext4, DM, loopback devices, crypto targets, SHA/Twofish/Whirlpool etc crypto algorithms, and all device drivers that exist in this particular box are compiled into the kernel (not as modules).

What am I missing?

The partitions on this box have been created by the Fedora 26 setup using automatic default layout with encryption.

# df
Filesystem               1K-blocks       Used Available Use% Mounted on
devtmpfs                   3802100          0   3802100   0% /dev
tmpfs                      3815908      13256   3802652   1% /dev/shm
tmpfs                      3815908       1376   3814532   1% /run
tmpfs                      3815908          0   3815908   0% /sys/fs/cgroup
/dev/mapper/fedora-root   51343840   11120320  37585696  23% /
tmpfs                      3815908          8   3815900   1% /tmp
/dev/sdb1                   999320     234112    696396  26% /boot
/dev/mapper/fedora-home  419382152  144294060 253714960  37% /home

# lvm lvdisplay
File descriptor 10 (pipe:[100000]) leaked on lvm invocation. Parent PID 3886: bash
  --- Logical volume ---
  LV Path                /dev/fedora/swap
  LV Name                swap
  VG Name                fedora
  LV UUID                ...
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-15 08:43:20 -0400
  LV Status              available
  # open                 2
  LV Size                7.41 GiB
  Current LE             1897
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Path                /dev/fedora/home
  LV Name                home
  VG Name                fedora
  LV UUID                ...
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-15 08:43:21 -0400
  LV Status              available
  # open                 1
  LV Size                407.35 GiB
  Current LE             104281
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3

  --- Logical volume ---
  LV Path                /dev/fedora/root
  LV Name                root
  VG Name                fedora
  LV UUID                ...
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-15 08:43:33 -0400
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1