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Fedora 21 won't boot after a routine update

I have a dual boot Fedora 21 / Windows 7 system. I've been using the Fedora 21 partition with no real problems for almost two months now. This partition runs off a mirrored pair of disks. The RAID is created using AMD's 2009 "RAID Option ROM Version 3.0.1540.59".

I do incremental updates of this system regularly. After this morning's update, the machine will no longer boot to the login screen: it hangs after the Fedora symbol is filled out and flashes. I don't remember the precise list of items, but it was about a dozen long.

When I enter rescue mode, I get

Generating "/run/initramfs/rdsosreport.txt"

Entering emergency mode.  Exit the shell to continue.
Type "journalctl" to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.

Issuing the suggested command gives nothing

:/# journalctl
No journal files were found.

The rdsosreport.txt file follows:

+ cat /lib/dracut/dracut-038-30.git20140903.fc21
dracut-038-30.git20140903.fc21
+ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-0-rescue-92839d79c2b040f0a0aa2b9da28d558a root=UUID=a3e68691-0c2b-45d3-97bb-37728e6542d5 ro rd.dm.uuid=pdc_bdfdbiibcj rhgb quiet
+ '[' -f /etc/cmdline ']'
+ for _i in '/etc/cmdline.d/*.conf'
+ '[' -f '/etc/cmdline.d/*.conf' ']'
+ break
+ cat /proc/self/mountinfo
0 0 0:1 / / rw shared:1 - rootfs rootfs rw
15 0 0:15 / /sys rw,nosuid,nodev,noexec,relatime shared:2 - sysfs sysfs rw
16 0 0:3 / /proc rw,nosuid,nodev,noexec,relatime shared:7 - proc proc rw
17 0 0:5 / /dev rw,nosuid shared:8 - devtmpfs devtmpfs rw,size=4060392k,nr_inodes=1015098,mode=755
18 15 0:16 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:3 - securityfs securityfs rw
19 17 0:17 / /dev/shm rw,nosuid,nodev shared:9 - tmpfs tmpfs rw
20 17 0:11 / /dev/pts rw,nosuid,noexec,relatime shared:10 - devpts devpts rw,gid=5,mode=620,ptmxmode=000
21 0 0:18 / /run rw,nosuid,nodev shared:11 - tmpfs tmpfs rw,mode=755
22 15 0:19 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:4 - tmpfs tmpfs ro,mode=755
23 22 0:20 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:5 - cgroup cgroup rw,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd
24 15 0:21 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:6 - pstore pstore rw
25 22 0:22 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:12 - cgroup cgroup rw,cpuset
26 22 0:23 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,cpu,cpuacct
27 22 0:24 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,memory
28 22 0:25 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,devices
29 22 0:26 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,freezer
30 22 0:27 / /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,net_cls,net_prio
31 22 0:28 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,blkio
32 22 0:29 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,perf_event
33 22 0:30 / /sys/fs/cgroup/hugetlb rw,nosuid,nodev,noexec,relatime shared:20 - cgroup cgroup rw,hugetlb
34 0 0:31 / /var/lib/nfs/rpc_pipefs rw,relatime shared:21 - rpc_pipefs rpc_pipefs rw
56 15 0:32 / /sys/kernel/config rw,relatime shared:22 - configfs configfs rw
+ cat /proc/mounts
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs rw,nosuid,size=4060392k,nr_inodes=1015098,mode=755 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
rpc_pipefs /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
+ blkid
/dev/sda1: UUID="9a0a1ba6-940f-43ca-9d7f-af9e60803e59" TYPE="ext4" PARTUUID="000e89ab-01"
/dev/sda2: UUID="a3e68691-0c2b-45d3-97bb-37728e6542d5" TYPE="ext4" PARTUUID="000e89ab-02"
/dev/sda3: UUID="4d33d022-7d36-4257-bdc0-afab9dc52dd9" TYPE="swap" PARTUUID="000e89ab-03"
/dev/sda5: UUID="6b15135a-08a7-4233-a178-2bc464e2716f" TYPE="ext4" PARTUUID="000e89ab-05"
/dev/sda6: UUID="1b04e336-bbac-42f6-8655-7ab929fca2ab" TYPE="ext4" PARTUUID="000e89ab-06"
/dev/sdb1: LABEL="System Reserved" UUID="B84669E34669A33C" TYPE="ntfs" PARTUUID="000770ea-01"
/dev/sdb2: UUID="443E6B2A3E6B1468" TYPE="ntfs" PARTUUID="000770ea-02"
/dev/sdc1: UUID="9a0a1ba6-940f-43ca-9d7f-af9e60803e59" TYPE="ext4" PARTUUID="000e89ab-01"
/dev/sdc2: UUID="a3e68691-0c2b-45d3-97bb-37728e6542d5" TYPE="ext4" PARTUUID="000e89ab-02"
/dev/sdc3: UUID="4d33d022-7d36-4257-bdc0-afab9dc52dd9" TYPE="swap" PARTUUID="000e89ab-03"
/dev/sdc5: UUID="6b15135a-08a7-4233-a178-2bc464e2716f" TYPE="ext4" PARTUUID="000e89ab-05"
/dev/sdc6: UUID="1b04e336-bbac-42f6-8655-7ab929fca2ab" TYPE="ext4" PARTUUID="000e89ab-06"
/dev/mapper/pdc_bdfdbiibcj: PTUUID="000e89ab" PTTYPE="dos"
/dev/mapper/pdc_bdfdbiibcj1: UUID="9a0a1ba6-940f-43ca-9d7f-af9e60803e59" TYPE="ext4" PARTUUID="000e89ab-01"
/dev/mapper/pdc_bdfdbiibcj2: UUID="a3e68691-0c2b-45d3-97bb-37728e6542d5" TYPE="ext4" PARTUUID="000e89ab-02"
/dev/mapper/pdc_bdfdbiibcj3: UUID="4d33d022-7d36-4257-bdc0-afab9dc52dd9" TYPE="swap" PARTUUID="000e89ab-03"
/dev/mapper/pdc_bdfdbiibcj5: UUID="6b15135a-08a7-4233-a178-2bc464e2716f" TYPE="ext4" PARTUUID="000e89ab-05"
/dev/mapper/pdc_bdfdbiibcj6: UUID="1b04e336-bbac-42f6-8655-7ab929fca2ab" TYPE="ext4" PARTUUID="000e89ab-06"
+ blkid -o udev
ID_FS_UUID=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_UUID_ENC=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-01

ID_FS_UUID=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_UUID_ENC=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-02

ID_FS_UUID=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_UUID_ENC=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_TYPE=swap
ID_FS_PARTUUID=000e89ab-03

ID_FS_UUID=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_UUID_ENC=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-05

ID_FS_UUID=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_UUID_ENC=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-06

ID_FS_LABEL=System_Reserved
ID_FS_LABEL_ENC=System\x20Reserved
ID_FS_UUID=B84669E34669A33C
ID_FS_UUID_ENC=B84669E34669A33C
ID_FS_TYPE=ntfs
ID_FS_PARTUUID=000770ea-01

ID_FS_UUID=443E6B2A3E6B1468
ID_FS_UUID_ENC=443E6B2A3E6B1468
ID_FS_TYPE=ntfs
ID_FS_PARTUUID=000770ea-02

ID_FS_UUID=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_UUID_ENC=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-01

ID_FS_UUID=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_UUID_ENC=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-02

ID_FS_UUID=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_UUID_ENC=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_TYPE=swap
ID_FS_PARTUUID=000e89ab-03

ID_FS_UUID=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_UUID_ENC=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-05

ID_FS_UUID=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_UUID_ENC=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-06

ID_FS_UUID=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_UUID_ENC=9a0a1ba6-940f-43ca-9d7f-af9e60803e59
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-01

ID_FS_UUID=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_UUID_ENC=a3e68691-0c2b-45d3-97bb-37728e6542d5
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-02

ID_FS_UUID=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_UUID_ENC=4d33d022-7d36-4257-bdc0-afab9dc52dd9
ID_FS_TYPE=swap
ID_FS_PARTUUID=000e89ab-03

ID_FS_UUID=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_UUID_ENC=6b15135a-08a7-4233-a178-2bc464e2716f
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-05

ID_FS_UUID=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_UUID_ENC=1b04e336-bbac-42f6-8655-7ab929fca2ab
ID_FS_TYPE=ext4
ID_FS_PARTUUID=000e89ab-06

ID_PART_TABLE_UUID=000e89ab
ID_PART_TABLE_TYPE=dos
+ ls -l /dev/disk/by-id /dev/disk/by-label /dev/disk/by-uuid
/dev/disk/by-id:
total 0
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 ata-SAMSUNG_DVDWBD_SH-B083L_R4306GHZ201005 -> ../../sr0
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149 -> ../../sda
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part1 -> ../../sda1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part2 -> ../../sda2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part3 -> ../../sda3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part4 -> ../../sda4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part5 -> ../../sda5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202149-part6 -> ../../sda6
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150 -> ../../sdc
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part1 -> ../../sdc1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part2 -> ../../sdc2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part3 -> ../../sdc3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part4 -> ../../sdc4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part5 -> ../../sdc5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD103SJ_S246J1KZ202150-part6 -> ../../sdc6
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 ata-SAMSUNG_HD253GJ_S24JJ1MZ203595 -> ../../sdb
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD253GJ_S24JJ1MZ203595-part1 -> ../../sdb1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 ata-SAMSUNG_HD253GJ_S24JJ1MZ203595-part2 -> ../../sdb2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj -> ../../dm-0
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj1 -> ../../dm-1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj2 -> ../../dm-2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj3 -> ../../dm-3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj4 -> ../../dm-4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj5 -> ../../dm-5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-name-pdc_bdfdbiibcj6 -> ../../dm-6
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-DMRAID-pdc_bdfdbiibcj -> ../../dm-0
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part1-DMRAID-pdc_bdfdbiibcj -> ../../dm-1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part2-DMRAID-pdc_bdfdbiibcj -> ../../dm-2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part3-DMRAID-pdc_bdfdbiibcj -> ../../dm-3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part4-DMRAID-pdc_bdfdbiibcj -> ../../dm-4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part5-DMRAID-pdc_bdfdbiibcj -> ../../dm-5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 dm-uuid-part6-DMRAID-pdc_bdfdbiibcj -> ../../dm-6
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 wwn-0x50024e900302093a -> ../../sda
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part1 -> ../../sda1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part2 -> ../../sda2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part3 -> ../../sda3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part4 -> ../../sda4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part5 -> ../../sda5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e900302093a-part6 -> ../../sda6
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 wwn-0x50024e9003020940 -> ../../sdc
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part1 -> ../../sdc1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part2 -> ../../sdc2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part3 -> ../../sdc3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part4 -> ../../sdc4
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part5 -> ../../sdc5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e9003020940-part6 -> ../../sdc6
lrwxrwxrwx 1 root 0  9 Feb 12 13:01 wwn-0x50024e90030b615c -> ../../sdb
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e90030b615c-part1 -> ../../sdb1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 wwn-0x50024e90030b615c-part2 -> ../../sdb2

/dev/disk/by-label:
total 0
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 System\x20Reserved -> ../../sdb1

/dev/disk/by-uuid:
total 0
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 1b04e336-bbac-42f6-8655-7ab929fca2ab -> ../../sdc6
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 443E6B2A3E6B1468 -> ../../sdb2
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 4d33d022-7d36-4257-bdc0-afab9dc52dd9 -> ../../sdc3
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 6b15135a-08a7-4233-a178-2bc464e2716f -> ../../sdc5
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 9a0a1ba6-940f-43ca-9d7f-af9e60803e59 -> ../../dm-1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 B84669E34669A33C -> ../../sdb1
lrwxrwxrwx 1 root 0 10 Feb 12 13:01 a3e68691-0c2b-45d3-97bb-37728e6542d5 -> ../../sdc2
+ for _i in '/etc/conf.d/*.conf'
+ '[' -f /etc/conf.d/systemd.conf ']'
+ echo /etc/conf.d/systemd.conf
/etc/conf.d/systemd.conf
+ cat /etc/conf.d/systemd.conf
systemdutildir="/usr/lib/systemd"
systemdsystemunitdir="/usr/lib/systemd/system"
systemdsystemconfdir="/etc/systemd/system"
+ command -v lvm
+ lvm pvdisplay
+ lvm vgdisplay
  No volume groups found
+ lvm lvdisplay
  No volume groups found
+ command -v dmsetup
+ dmsetup ls --tree
pdc_bdfdbiibcj6 (253:6)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
pdc_bdfdbiibcj5 (253:5)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
pdc_bdfdbiibcj4 (253:4)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
pdc_bdfdbiibcj3 (253:3)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
pdc_bdfdbiibcj2 (253:2)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
pdc_bdfdbiibcj1 (253:1)
 `-pdc_bdfdbiibcj (253:0)
    |- (8:32)
    `- (8:0)
+ cat /proc/mdstat
Personalities : 
unused devices: <none>
+ command -v ip
+ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 48:5b:39:02:ec:10 brd ff:ff:ff:ff:ff:ff
+ command -v journalctl
+ journalctl -ab --no-pager -o short-monotonic
No journal files were found.

I am able to mount the filesystems (/boot, /, /var, /home) manually (using the /dev/mapper/pdc_bdfdbiibcj* names), and it appears that their contents are intact.

I'd be grateful for any pointers on how to diagnose the hang and get past it.