Mit dem Upgrade: [ALPM] upgraded mdadm (4.4-2 → 4.5-1) bootet das System nicht mehr, da keine MD-Devices mehr da sind:

Booting initrd of Arch Linux.
         Expecting device /dev/mapper/vg0-root...
[  OK  ] Reached target Path Units.
[  OK  ] Reached target Slice Units.
[  OK  ] Reached target Swaps.
[  OK  ] Reached target Timer Units.
[  OK  ] Listening on Journal Socket (/dev/log).
[  OK  ] Listening on Journal Sockets.
[  OK  ] Listening on udev Control Socket.
[  OK  ] Listening on udev Kernel Socket.
[  OK  ] Reached target Socket Units.
         Starting Create List of Static Device Nodes...
         Starting Journal Service...
         Starting Load Kernel Modules...
         Starting Create Static Device Nodes in /dev...
         Starting Coldplug All udev Devices...
[  OK  ] Finished Create List of Static Device Nodes.
[  OK  ] Finished Load Kernel Modules.
[  OK  ] Finished Create Static Device Nodes in /dev.
[  OK  ] Started Journal Service.
[  OK  ] Reached target Preparation for Local File Systems.
[  OK  ] Reached target Local File Systems.
         Starting Create System Files and Directories...
         Starting Rule-based Manager for Device Events and Files...
[  OK  ] Finished Create System Files and Directories.
[  OK  ] Started Rule-based Manager for Device Events and Files.
[  OK  ] Finished Coldplug All udev Devices.
[  OK  ] Reached target System Initialization.
[  OK  ] Reached target Basic System.
         Starting Virtual Console Setup...
[  OK  ] Finished Virtual Console Setup.
[ TIME ] Timed out waiting for device /dev/mapper/vg0-root.
[DEPEND] Dependency failed for /sysroot.
[DEPEND] Dependency failed for Initrd Root File System.
[DEPEND] Dependency failed for Mountpoints Configured in the Real Root.
[DEPEND] Dependency failed for Initrd Root Device.
[DEPEND] Dependency failed for File System Check on /dev/mapper/vg0-root.
[  OK  ] Stopped target Basic System.
[  OK  ] Reached target Initrd File Systems.
[  OK  ] Stopped target System Initialization.
[  OK  ] Started Emergency Shell.
[  OK  ] Reached target Emergency Mode.

Hier ist jetzt erst mal Schluss. So geht es weiter:

~ # modprobe md
~ # mdadm --assemble --run /dev/md/system
mdadm: /dev/md/system has been started with 2 drives.
~ # exit

Nun läuft wieder alles weiter:

Reloading system manager configuration.
Starting initrd.target

Welcome to Arch Linux!

[  OK  ] Stopped Switch Root.
[  OK  ] Created slice Slice /system/dirmngr.
[  OK  ] Created slice Slice /system/getty.
[  OK  ] Created slice Slice /system/gpg-agent.
[  OK  ] Created slice Slice /system/gpg-agent-browser.
[  OK  ] Created slice Slice /system/gpg-agent-extra.
[  OK  ] Created slice Slice /system/gpg-agent-ssh.
[  OK  ] Created slice Slice /system/keyboxd.
[  OK  ] Created slice Slice /system/modprobe.
[  OK  ] Created slice Slice /system/query.
[  OK  ] Created slice Slice /system/serial-getty.
[  OK  ] Created slice Slice /system/systemd-fsck.
[  OK  ] Created slice User and Session Slice.
[  OK  ] Started Dispatch Password Requests to Console Directory Watch.
[  OK  ] Started Forward Password Requests to Wall Directory Watch.
[  OK  ] Set up automount Arbitrary Executable File Formats File System Automount Point.
         Expecting device /dev/disk/by-uuid/C2F3-DE40...
         Expecting device /dev/disk/by-uuid/C3FB-30CF...
         Expecting device /dev/hvc0...
[  OK  ] Reached target Local Encrypted Volumes.
[  OK  ] Reached target Image Downloads.
[  OK  ] Stopped target Switch Root.
[  OK  ] Stopped target Initrd File Systems.
[  OK  ] Stopped target Initrd Root File System.
[  OK  ] Reached target Local Integrity Protected Volumes.
[  OK  ] Reached target Path Units.
[  OK  ] Reached target Remote File Systems.
[  OK  ] Reached target Slice Units.
[  OK  ] Reached target Local Verity Protected Volumes.
[  OK  ] Listening on Device-mapper event daemon FIFOs.
[  OK  ] Listening on LVM2 poll daemon socket.
[  OK  ] Listening on Query the User Interactively for a Password.
[  OK  ] Listening on Process Core Dump Socket.
[  OK  ] Listening on Credential Encryption/Decryption.
[  OK  ] Listening on Factory Reset Management.
[  OK  ] Listening on Console Output Muting Service Socket.
[  OK  ] Listening on Network Management Resolve Hook Socket.
[  OK  ] Listening on Network Management Varlink Socket.
[  OK  ] Listening on Network Management Netlink Socket.
[  OK  ] Listening on Disk Repartitioning Service Socket.
[  OK  ] Listening on Resolve Monitor Varlink Socket.
[  OK  ] Listening on Resolve Service Varlink Socket.
[  OK  ] Listening on udev Control Socket.
[  OK  ] Listening on udev Varlink Socket.
[  OK  ] Listening on User Database Manager Socket.
         Activating swap /dev/mapper/vg0-swap...
         Mounting Huge Pages File System...
         Mounting POSIX Message Queue File System...
         Mounting Kernel Debug File System...
         Mounting Kernel Trace File System...
         Starting Create List of Static Device Nodes...
         Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
         Mounting Kernel Configuration File System...
         Mounting FUSE Control File System...
         Starting Journal Service...
         Starting Generate Network Units from Kernel Command Line...
         Starting Remount Root and Kernel File Systems...
         Starting Apply Kernel Variables...
         Starting Load udev Rules from Credentials...
         Starting Coldplug All udev Devices...
[  OK  ] Activated swap /dev/mapper/vg0-swap.
[  OK  ] Started Journal Service.
[  OK  ] Mounted Huge Pages File System.
[  OK  ] Mounted POSIX Message Queue File System.
[  OK  ] Mounted Kernel Debug File System.
[  OK  ] Mounted Kernel Trace File System.
[  OK  ] Finished Create List of Static Device Nodes.
[  OK  ] Finished Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.
[  OK  ] Mounted Kernel Configuration File System.
[  OK  ] Mounted FUSE Control File System.
[  OK  ] Finished Generate Network Units from Kernel Command Line.
[  OK  ] Finished Remount Root and Kernel File Systems.
[  OK  ] Finished Apply Kernel Variables.
[  OK  ] Finished Load udev Rules from Credentials.
[  OK  ] Reached target Preparation for Network.
[  OK  ] Reached target Swaps.
         Starting Flush Journal to Persistent Storage...
         Starting Load/Save OS Random Seed...
         Starting Create Static Device Nodes in /dev gracefully...
         Starting User Database Manager...
[  OK  ] Started User Database Manager.
[  OK  ] Finished Load/Save OS Random Seed.
[  OK  ] Finished Create Static Device Nodes in /dev gracefully.
         Starting Create System Users...
[  OK  ] Finished Coldplug All udev Devices.
[  OK  ] Finished Create System Users.
         Starting Network Name Resolution...
         Starting Create Static Device Nodes in /dev...
[  OK  ] Finished Flush Journal to Persistent Storage.
[  OK  ] Finished Create Static Device Nodes in /dev.
[  OK  ] Reached target Preparation for Local File Systems.
         Starting Rule-based Manager for Device Events and Files...
[  OK  ] Started Network Name Resolution.
[  OK  ] Reached target Host and Network Name Lookups.
[  OK  ] Started Rule-based Manager for Device Events and Files.
         Starting Network Management...
[  OK  ] Started Network Management.
[  OK  ] Reached target Network.
         Starting Enable Persistent Storage in systemd-networkd...
[  OK  ] Started MD array monitor.
[  OK  ] Finished Enable Persistent Storage in systemd-networkd.
         Starting File System Check on /dev/disk/by-uuid/C2F3-DE40...
         Starting File System Check on /dev/disk/by-uuid/C3FB-30CF...
[  OK  ] Finished File System Check on /dev/disk/by-uuid/C2F3-DE40.
[  OK  ] Finished File System Check on /dev/disk/by-uuid/C3FB-30CF.
[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
         Starting Virtual Console Setup...
[  OK  ] Finished Virtual Console Setup.
[  OK  ] Reached target Sound Card.
         Mounting /boot...
         Mounting /boot1...
         Mounting Temporary Directory /tmp...
[  OK  ] Listening on Disk Image Download Service Socket.
[  OK  ] Mounted Temporary Directory /tmp.
[  OK  ] Reached target Local File Systems.
[  OK  ] Listening on Boot Entries Service Socket.
[  OK  ] Listening on System Extension Image Management.
         Starting Update Boot Loader Random Seed...
         Starting Create System Files and Directories...
         Starting Load JSON user/group Records from Credentials...
[  OK  ] Mounted /boot.
[  OK  ] Mounted /boot1.
[  OK  ] Finished Load JSON user/group Records from Credentials.
[  OK  ] Finished Update Boot Loader Random Seed.
[  OK  ] Finished Create System Files and Directories.
         Starting Rebuild Dynamic Linker Cache...
         Starting Rebuild Journal Catalog...
         Starting Record System Boot/Shutdown in UTMP...
[  OK  ] Finished Record System Boot/Shutdown in UTMP.
[  OK  ] Finished Rebuild Journal Catalog.
[  OK  ] Finished Rebuild Dynamic Linker Cache.
         Starting Update is Completed...
[  OK  ] Finished Update is Completed.
[  OK  ] Reached target System Initialization.
[  OK  ] Started Refresh existing PGP keys of archlinux-keyring regularly.
[  OK  ] Started Daily man-db regeneration.
[  OK  ] Started Discard unused packages weekly.
[  OK  ] Started Update the plocate database daily.
[  OK  ] Started Daily verification of password and group files.
[  OK  ] Started Daily Cleanup of Temporary Directories.
[  OK  ] Reached target Timer Units.
[  OK  ] Listening on D-Bus System Message Bus Socket.
[  OK  ] Listening on GnuPG network certificate management daemon for /etc/pacman.d/gnupg.
[  OK  ] Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers) for /etc/pacman.d/gnupg.
[  OK  ] Listening on GnuPG cryptographic agent and passphrase cache (restricted) for /etc/pacman.d/gnupg.
[  OK  ] Listening on GnuPG cryptographic agent (ssh-agent emulation) for /etc/pacman.d/gnupg.
[  OK  ] Listening on GnuPG cryptographic agent and passphrase cache for /etc/pacman.d/gnupg.
[  OK  ] Listening on GnuPG public key management service for /etc/pacman.d/gnupg.
[  OK  ] Listening on OpenSSH Server Socket (systemd-ssh-generator, AF_UNIX Local).
[  OK  ] Listening on Hostname Service Socket.
[  OK  ] Listening on User Login Management Varlink Socket.
[  OK  ] Listening on Virtual Machine and Container Registration Service Socket.
[  OK  ] Reached target Socket Units.
         Starting D-Bus System Message Bus...
[  OK  ] Started D-Bus System Message Bus.
[  OK  ] Reached target Basic System.
[  OK  ] Started QEMU Guest Agent.
         Starting Make a DNS Query for mirror.lab.swapon.de...
         Starting OpenSSH Daemon...
         Starting User Login Management...
         Starting Permit User Sessions...
[  OK  ] Started OpenSSH Daemon.
[  OK  ] Reached target SSH Access Available.
[  OK  ] Finished Permit User Sessions.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on hvc0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Finished Make a DNS Query for mirror.lab.swapon.de.
[  OK  ] Started User Login Management.
[  OK  ] Reached target Multi-User System.

Arch Linux 6.18.9-arch1-2 (hvc0)

mdtest login:

Ein Downgrade löst das Problem:

pacman -U /var/cache/pacman/pkg/mdadm-4.4-2-x86_64.pkg.tar.zst
mkinitcpio -P