My system is not booting anymore. (resolved)

[defiant_godmother]

i have a full disk encryption setup when upon loading initramfs i get prompted for a passphrase for a symmetric key which was used to encrypt the drive each time I boot.
I recently updated my system (i'm not 100% sure if that's related) and now, upon entering the correct passphrase i am being thrown into a dracut debug shell

Here's some info about my boot process:
When i boot the shim efi binary (shimx64.efi) from a partition labeled "A2C8-42B3" gets executed (this partition is mounted under /efi in my paste) (this partition also has an emergency EFI shell under /EFI/boot, please don't get confused), it then executes grubx64.efi binary located in the same directory, which consequently reads grub.cfg from the same directory.
grub executes a kernel image and initramfs from a partition with a UUID "b0d785e1-627e-498c-8d9e-eb20d43bf5eb" (this partition is mounted under /boot in my paste). initramfs then tries to decrypt the btrfs filesystem which lies under /dev/sda1 (/dev/sda1 is "ca32d232-f285-4824-8a2e-10664a22c341") encrypted (the 1TB drive) (the decrypted btrfs fs itself has a UUID of "f77e55b5-91ac-4840-b11d-7f69cdb0c16f" with a symmetric key named "crypt_key.luks.gpg". This key is encrypted itself, so initramfs asks me for a passphrase here.
After asking the passphrase and me entering the CORRECT (this is 100%) passphrase (if i enter incorrect passphrase it will ask me again) it just hangs for a moment and then after quite some time it opens a dracut# debug shell.

please note:
~ dracut.conf is valid, i successfully generated initramfs images before (using the same config) and my system was booting, i haven't touch dracut.conf since then.
~ in the paste i'm using a gentoo livecd and successfully decrypting the btrfs FS using `gpg --decrypt /boot/crypt_key.luks.gpg | cryptsetup --key-file - open /dev/sda1 root` and consequently mounting it under /mnt/gentoo.
~ i also tried without lsm=selinux, still the same. SELinux is in permissive anyways.
~ the problem appeared when yesterday i ran grub-mkconfig with some linux cmdline options (which i then deleted and restored the /etc/default/grub exactly the way it was before and ran grub-mkconfig again). Even after reverting grub config to the way it was before the issue still persists.


Here's the dmesg output from the dracut emergency shell : https://termbin.com/euqu (last 2 entries ("Volume was not properly unmounted") are because of my mistake when i already entered the dracut shell, it's unrelated)

Here's the contents of /run/initramfs/rdsosreport.txt file from the dracut emergency shell (it's quite long, that's why pastebin) : https://termbin.com/0oe9


Here's some info about how i generated initramfs image, grub config, lsblk, etc. (please let me know if i forgot something) :

[sMueggli]

The problem seems to be

[defiant_godmother]

[ggggg]

Can you please try the following ?

add_dracutmodules+=" systemd-cryptsetup crypt-gpg dm rootfs-block btrfs "

Are you using systemd ?

[defiant_godmother]

[defiant_godmother]

SOLUTION
it turns out GRUB was overwriting linux cmdline parameters (i.e. "root=UUID=<UUID>" parameter in dracut.conf was being overwritten to root=/dev/mapper/root by GRUB)
the solution is to make GRUB stop doing that:

[konsolebox]

Apparently this can also be solved by enabling the device-mapper USE flag in sys-boot/grub.

One can also use findmnt if that's not reliable enough.