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#1 2021-09-14 12:24:39

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

[Solved] Keyboard not working in emergency shell

I am trying to test the Rust for Linux kernel in my machine. It doesn't boot which isn't all that surprising. I get the following output:

mount: /new_root: unknown filesystem type 'btrfs'
You are now being dropped into an emergency shell
sh: can't access tty; job control turned off
[rootfs ]#

The important part however is that the keyboard does not work at this stage. I have also tried using this kernel in Fedora but I was able to at least login as root in the emergency shell and get the logs.
From reading Archwiki about mkinicpio I think that one possible reason would be that the default kernel config in Fedora build the keyboard-related stuff in the kernel while Arch default config has almost everything as a module.
So I wanted to ask what is the preferred method of debugging in this case in arch linux.

I can of course build the keyboard-related stuff in the kernel. Other might be to maybe use kernel parameters in grub.
Also, this kernel has to be compiled with LLVM, and not GCC.

Last edited by Ayush1325 (2021-09-17 07:30:45)

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#2 2021-09-14 14:48:45

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

Is atkbd not in the initramfs or is your initramfs on the btrfs partition?

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#3 2021-09-14 15:04:37

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

seth wrote:

Is atkbd not in the initramfs or is your initramfs on the btrfs partition?

The initramfs is in the /boot partition along with the normal kernel which was formatted as vfat.
The initramfs does not seem to have atkbd, at least not when using the following command to check:

lsinitcpio /boot/initramfs-linux-rust.img  | grep atkbd

But running the same command for the normal kernel initramfs comes up empty too, so I'm not sure if u ment this.
The fallback initramfs does have an atkbd.ko.zst file in modules, but the keyboard does not work in the fallback image either, so there is that.

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#4 2021-09-14 15:50:58

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

What's the output of "lsmod" when booting the regular kernel?

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#5 2021-09-14 15:54:21

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

seth wrote:

What's the output of "lsmod" when booting the regular kernel?

lsmod output:

Module                  Size  Used by
snd_seq_dummy          16384  0
snd_hrtimer            16384  1
snd_seq                90112  7 snd_seq_dummy
nft_objref             16384  1
nf_conntrack_netbios_ns    16384  1
nf_conntrack_broadcast    16384  1 nf_conntrack_netbios_ns
nft_fib_inet           16384  1
nft_fib_ipv4           16384  1 nft_fib_inet
nft_fib_ipv6           16384  1 nft_fib_inet
nft_fib                16384  3 nft_fib_ipv6,nft_fib_ipv4,nft_fib_inet
nft_reject_inet        16384  8
nf_reject_ipv4         16384  1 nft_reject_inet
nf_reject_ipv6         20480  1 nft_reject_inet
nft_reject             16384  1 nft_reject_inet
nft_ct                 20480  33
nft_chain_nat          16384  2
nf_tables             266240  395 nft_ct,nft_reject_inet,nft_fib_ipv6,nft_objref,nft_fib_ipv4,nft_chain_nat,nft_reject,nft_fib,nft_fib_inet
ip6table_nat           16384  0
ip6table_mangle        16384  0
ip6table_raw           16384  0
ip6table_security      16384  0
iptable_nat            16384  0
nf_nat                 53248  3 ip6table_nat,nft_chain_nat,iptable_nat
nf_conntrack          180224  4 nf_nat,nft_ct,nf_conntrack_netbios_ns,nf_conntrack_broadcast
nf_defrag_ipv6         24576  1 nf_conntrack
nf_defrag_ipv4         16384  1 nf_conntrack
iptable_mangle         16384  0
nvidia_drm             73728  7
iptable_raw            16384  0
iptable_security       16384  0
nvidia_modeset       1200128  17 nvidia_drm
rfkill                 32768  2
nfnetlink              20480  2 nf_tables
ip6table_filter        16384  0
ip6_tables             32768  5 ip6table_filter,ip6table_raw,ip6table_nat,ip6table_mangle,ip6table_security
nvidia              35319808  1128 nvidia_modeset
iptable_filter         16384  0
uvcvideo              118784  0
snd_usb_audio         352256  1
videobuf2_vmalloc      20480  1 uvcvideo
videobuf2_memops       20480  1 videobuf2_vmalloc
videobuf2_v4l2         36864  1 uvcvideo
vfat                   24576  1
videobuf2_common       69632  4 videobuf2_vmalloc,videobuf2_v4l2,uvcvideo,videobuf2_memops
igb                   266240  0
fat                    86016  1 vfat
snd_usbmidi_lib        45056  1 snd_usb_audio
videodev              270336  3 videobuf2_v4l2,uvcvideo,videobuf2_common
snd_rawmidi            45056  1 snd_usbmidi_lib
i2c_algo_bit           16384  1 igb
snd_seq_device         16384  2 snd_seq,snd_rawmidi
dca                    16384  1 igb
mc                     65536  5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common
intel_rapl_msr         20480  0
intel_rapl_common      28672  1 intel_rapl_msr
usblp                  28672  0
joydev                 28672  0
mousedev               24576  0
edac_mce_amd           36864  0
kvm_amd               147456  0
snd_hda_codec_realtek   159744  1
wmi_bmof               16384  0
mxm_wmi                16384  0
snd_hda_codec_generic    98304  1 snd_hda_codec_realtek
snd_hda_codec_hdmi     73728  1
ledtrig_audio          16384  1 snd_hda_codec_generic
kvm                  1056768  1 kvm_amd
snd_hda_intel          57344  2
irqbypass              16384  1 kvm
snd_intel_dspcfg       28672  1 snd_hda_intel
snd_intel_sdw_acpi     20480  1 snd_intel_dspcfg
crct10dif_pclmul       16384  1
crc32_pclmul           16384  0
snd_hda_codec         176128  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
ghash_clmulni_intel    16384  0
aesni_intel           380928  0
snd_hda_core          110592  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
crypto_simd            16384  1 aesni_intel
snd_hwdep              16384  2 snd_usb_audio,snd_hda_codec
cryptd                 28672  2 crypto_simd,ghash_clmulni_intel
rapl                   16384  0
drm_kms_helper        303104  1 nvidia_drm
pcspkr                 16384  0
snd_pcm               151552  5 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core
tpm_crb                20480  0
sp5100_tco             20480  0
usbhid                 65536  0
cec                    73728  1 drm_kms_helper
snd_timer              45056  3 snd_seq,snd_hrtimer,snd_pcm
k10temp                16384  0
tpm_tis                16384  0
syscopyarea            16384  1 drm_kms_helper
i2c_piix4              28672  0
snd                   114688  21 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
tpm_tis_core           28672  1 tpm_tis
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
tpm                    90112  3 tpm_tis,tpm_crb,tpm_tis_core
ccp                   118784  1 kvm_amd
soundcore              16384  1 snd
fb_sys_fops            16384  1 drm_kms_helper
gpio_amdpt             20480  0
wmi                    36864  2 wmi_bmof,mxm_wmi
pinctrl_amd            32768  0
rng_core               16384  2 ccp,tpm
gpio_generic           20480  1 gpio_amdpt
mac_hid                16384  0
acpi_cpufreq           32768  0
drm                   585728  11 drm_kms_helper,nvidia,nvidia_drm
crypto_user            20480  0
fuse                  167936  5
bpf_preload            16384  0
ip_tables              32768  5 iptable_filter,iptable_security,iptable_raw,iptable_nat,iptable_mangle
x_tables               53248  12 ip6table_filter,ip6table_raw,iptable_filter,iptable_security,ip6table_nat,ip6_tables,iptable_raw,ip_tables,iptable_nat,ip6table_mangle,ip6table_security,iptable_mangle
btrfs                1658880  2
blake2b_generic        20480  0
libcrc32c              16384  4 nf_conntrack,nf_nat,btrfs,nf_tables
crc32c_generic         16384  0
xor                    24576  1 btrfs
raid6_pq              122880  1 btrfs
sr_mod                 28672  0
xhci_pci               20480  0
crc32c_intel           24576  3
cdrom                  81920  1 sr_mod
xhci_pci_renesas       20480  1 xhci_pci

Here is my mkinitcpio.conf too just in case:

# vim:set ft=sh
# MODULES
# The following modules are loaded before any boot hooks are
# run.  Advanced users may wish to specify all system modules
# in this array.  For instance:
#     MODULES=(piix ide_disk reiserfs)
# MODULES=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)
MODULES=()

# BINARIES
# This setting includes any additional binaries a given user may
# wish into the CPIO image.  This is run last, so it may be used to
# override the actual binaries included by a given hook
# BINARIES are dependency parsed, so you may safely ignore libraries
BINARIES=()

# FILES
# This setting is similar to BINARIES above, however, files are added
# as-is and are not parsed in any way.  This is useful for config files.
FILES=()

# HOOKS
# This is the most important setting in this file.  The HOOKS control the
# modules and scripts added to the image, and what happens at boot time.
# Order is important, and it is recommended that you do not change the
# order in which HOOKS are added.  Run 'mkinitcpio -H <hook name>' for
# help on a given hook.
# 'base' is _required_ unless you know precisely what you are doing.
# 'udev' is _required_ in order to automatically load modules
# 'filesystems' is _required_ unless you specify your fs modules in MODULES
# Examples:
##   This setup specifies all modules in the MODULES setting above.
##   No raid, lvm2, or encrypted root is needed.
#    HOOKS=(base)
#
##   This setup will autodetect all modules for your system and should
##   work as a sane default
#    HOOKS=(base udev autodetect block filesystems)
#
##   This setup will generate a 'full' image which supports most systems.
##   No autodetection is done.
#    HOOKS=(base udev block filesystems)
#
##   This setup assembles a pata mdadm array with an encrypted root FS.
##   Note: See 'mkinitcpio -H mdadm' for more information on raid devices.
#    HOOKS=(base udev block mdadm encrypt filesystems)
#
##   This setup loads an lvm2 volume group on a usb device.
#    HOOKS=(base udev block lvm2 filesystems)
#
##   NOTE: If you have /usr on a separate partition, you MUST include the
#    usr, fsck and shutdown hooks.
HOOKS=(base udev autodetect modconf block filesystems keyboard fsck)

# COMPRESSION
# Use this to compress the initramfs image. By default, zstd compression
# is used. Use 'cat' to create an uncompressed image.
#COMPRESSION="zstd"
#COMPRESSION="gzip"
#COMPRESSION="bzip2"
#COMPRESSION="lzma"
#COMPRESSION="xz"
#COMPRESSION="lzop"
#COMPRESSION="lz4"

# COMPRESSION_OPTIONS
# Additional options for the compressor
#COMPRESSION_OPTIONS=()

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#6 2021-09-14 16:12:10

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

Check the initramfs of the problem-kernel for

kvm_amd               147456  0
wmi_bmof               16384  0
mxm_wmi                16384  0
kvm                  1056768  1 kvm_amd
irqbypass              16384  1 kvm
aesni_intel           380928  0
usbhid                 65536  0
i2c_piix4              28672  0
ccp                   118784  1 kvm_amd
gpio_amdpt             20480  0
wmi                    36864  2 wmi_bmof,mxm_wmi
pinctrl_amd            32768  0
mac_hid                16384  0

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#7 2021-09-14 16:48:05

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

seth wrote:

Check the initramfs of the problem-kernel for

Well, I'm not quite sure how to check it other than lsmod without booting into it, so can you provide a wiki link or example?
For the time being, here is the ouptut of the problem kernel initramfs files:

bin
buildconfig
config
dev/
etc/
etc/fstab
etc/initrd-release
etc/ld.so.cache
etc/ld.so.conf
etc/modprobe.d/
etc/modprobe.d/firewalld-sysctls.conf
etc/mtab
hooks/
hooks/udev
init
init_functions
lib
lib64
new_root/
proc/
run/
sbin
sys/
tmp/
usr/
usr/bin/
usr/bin/[
usr/bin/arch
usr/bin/ash
usr/bin/awk
usr/bin/base32
usr/bin/base64
usr/bin/basename
usr/bin/bc
usr/bin/blkdiscard
usr/bin/blkid
usr/bin/busybox
usr/bin/bzip2
usr/bin/cat
usr/bin/chgrp
usr/bin/chmod
usr/bin/chown
usr/bin/chroot
usr/bin/clear
usr/bin/cp
usr/bin/cpio
usr/bin/cttyhack
usr/bin/cut
usr/bin/dd
usr/bin/depmod
usr/bin/df
usr/bin/dirname
usr/bin/dmesg
usr/bin/du
usr/bin/echo
usr/bin/env
usr/bin/expr
usr/bin/fallocate
usr/bin/false
usr/bin/fatattr
usr/bin/free
usr/bin/fsck
usr/bin/fsck.btrfs
usr/bin/fsfreeze
usr/bin/fstrim
usr/bin/fsync
usr/bin/getopt
usr/bin/grep
usr/bin/gzip
usr/bin/halt
usr/bin/head
usr/bin/hexdump
usr/bin/hexedit
usr/bin/i2ctransfer
usr/bin/ifconfig
usr/bin/init
usr/bin/insmod
usr/bin/install
usr/bin/ip
usr/bin/ipaddr
usr/bin/iplink
usr/bin/ipneigh
usr/bin/iproute
usr/bin/iprule
usr/bin/iptunnel
usr/bin/kbd_mode
usr/bin/kill
usr/bin/killall
usr/bin/kmod
usr/bin/less
usr/bin/link
usr/bin/ln
usr/bin/loadfont
usr/bin/loadkmap
usr/bin/losetup
usr/bin/ls
usr/bin/lsmod
usr/bin/lsscsi
usr/bin/lzop
usr/bin/md5sum
usr/bin/mim
usr/bin/mkdir
usr/bin/mkfifo
usr/bin/mknod
usr/bin/mkpasswd
usr/bin/mktemp
usr/bin/modinfo
usr/bin/modprobe
usr/bin/mount
usr/bin/mountpoint
usr/bin/mv
usr/bin/nc
usr/bin/netstat
usr/bin/nologin
usr/bin/nproc
usr/bin/nsenter
usr/bin/nslookup
usr/bin/nuke
usr/bin/openvt
usr/bin/partprobe
usr/bin/paste
usr/bin/pgrep
usr/bin/pidof
usr/bin/ping
usr/bin/ping6
usr/bin/poweroff
usr/bin/printf
usr/bin/ps
usr/bin/pwd
usr/bin/readlink
usr/bin/realpath
usr/bin/reboot
usr/bin/resume
usr/bin/rm
usr/bin/rmdir
usr/bin/rmmod
usr/bin/route
usr/bin/run-init
usr/bin/sed
usr/bin/seq
usr/bin/setfattr
usr/bin/setfont
usr/bin/sh
usr/bin/sha1sum
usr/bin/sha256sum
usr/bin/sha512sum
usr/bin/shuf
usr/bin/sleep
usr/bin/sort
usr/bin/stat
usr/bin/strings
usr/bin/switch_root
usr/bin/sync
usr/bin/systemd-tmpfiles
usr/bin/tac
usr/bin/tail
usr/bin/tar
usr/bin/tcpsvd
usr/bin/tee
usr/bin/telnet
usr/bin/test
usr/bin/tftp
usr/bin/touch
usr/bin/true
usr/bin/truncate
usr/bin/ts
usr/bin/udevadm
usr/bin/udhcpc
usr/bin/udhcpc6
usr/bin/umount
usr/bin/uname
usr/bin/uniq
usr/bin/unlink
usr/bin/unshare
usr/bin/unzip
usr/bin/uptime
usr/bin/vi
usr/bin/wc
usr/bin/wget
usr/bin/which
usr/bin/xxd
usr/bin/xz
usr/bin/yes
usr/lib/
usr/lib64
usr/lib/ld-linux-x86-64.so.2
usr/lib/libacl.so.1
usr/lib/libaudit.so.1
usr/lib/libblkid.so.1
usr/lib/libcap-ng.so.0
usr/lib/libcap.so.2
usr/lib/libcrypto.so.1.1
usr/lib/libcrypt.so.2
usr/lib/libc.so.6
usr/lib/libdl.so.2
usr/lib/libffi.so.7
usr/lib/libgcrypt.so.20
usr/lib/libgpg-error.so.0
usr/lib/libip4tc.so.2
usr/lib/libkmod.so.2
usr/lib/liblz4.so.1
usr/lib/liblzma.so.5
usr/lib/libmount.so.1
usr/lib/libp11-kit.so.0
usr/lib/libpam.so.0
usr/lib/libpthread.so.0
usr/lib/librt.so.1
usr/lib/libseccomp.so.2
usr/lib/libz.so.1
usr/lib/libzstd.so.1
usr/lib/modprobe.d/
usr/lib/modprobe.d/bluetooth-usb.conf
usr/lib/modprobe.d/nvdimm-security.conf
usr/lib/modprobe.d/nvidia.conf
usr/lib/modprobe.d/nvidia-dkms.conf
usr/lib/modprobe.d/systemd.conf
usr/lib/modules/
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/blake2b_generic.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/btrfs.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/cdrom.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/crc32c_generic.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/crc32c-intel.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/crc-itu-t.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/firewire-core.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/firewire-sbp2.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/libcrc32c.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/mmc_block.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/mmc_core.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/raid6_pq.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/sha256-ssse3.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/sr_mod.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/usbhid.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/usb-storage.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/virtio_blk.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/xhci-pci.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/xhci-pci-renesas.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/xor.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/kernel/xxhash_generic.ko.zst
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.alias.bin
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.builtin.alias.bin
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.builtin.bin
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.dep.bin
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.devname
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.softdep
usr/lib/modules/5.14.0-rc3-1-rust-81529-g3976bd9d29fd/modules.symbols.bin
usr/lib/systemd/
usr/lib/systemd/libsystemd-shared-249.so
usr/lib/systemd/systemd-udevd
usr/lib/udev/
usr/lib/udev/ata_id
usr/lib/udev/rules.d/
usr/lib/udev/rules.d/50-udev-default.rules
usr/lib/udev/rules.d/60-persistent-storage.rules
usr/lib/udev/rules.d/64-btrfs.rules
usr/lib/udev/rules.d/80-drivers.rules
usr/lib/udev/scsi_id
usr/local/
usr/local/bin
usr/local/lib
usr/local/sbin
usr/sbin
var/
var/run
VERSION

There is no difference between the initramfs files other than the diffreence in the module paths.

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#8 2021-09-14 19:59:12

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

pretty much "lsinicpio … | grep …"
On a quick glance, none of them is there (so try explicitly edding them), but btrfs is there - do you face the emergency shell drop-off w/ that initramfs?

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#9 2021-09-15 02:33:18

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

seth wrote:

pretty much "lsinicpio … | grep …"
On a quick glance, none of them is there (so try explicitly edding them), but btrfs is there - do you face the emergency shell drop-off w/ that initramfs?

Yup, I tried both the normal and fallback initramfs and results are the same. Drops me in the emergency shell without keyboard.
I also compared the initramfs of problem kernel with the base kernel but there is no difference other than the name of the kernel.
The only other thing I can think of is that maybe arch linux doesn't play nice with kernel compiled with LLVM?

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#10 2021-09-15 07:27:02

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

This is not related to "archlinux"  - you're not reaching the system.
"unknown filesystem type 'btrfs'" means there's no btrfs module available - despite the lsinicpio output.
The only thing I could imagine if you're actually booting the proper initramfs is that the kernel somehow lacks zstd support - igrep the config for ZSTD.

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

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#11 2021-09-15 09:26:41

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

seth wrote:

This is not related to "archlinux"  - you're not reaching the system.
"unknown filesystem type 'btrfs'" means there's no btrfs module available - despite the lsinicpio output.
The only thing I could imagine if you're actually booting the proper initramfs is that the kernel somehow lacks zstd support - igrep the config for ZSTD.

Well, here are all instances of zstd in the kernel config:

CONFIG_HAVE_KERNEL_ZSTD=y
CONFIG_KERNEL_ZSTD=y
CONFIG_RD_ZSTD=y
CONFIG_MODULE_COMPRESS_ZSTD=y
CONFIG_F2FS_FS_ZSTD=y
CONFIG_UBIFS_FS_ZSTD=y
CONFIG_SQUASHFS_ZSTD=y
CONFIG_PSTORE_ZSTD_COMPRESS=y
CONFIG_PSTORE_ZSTD_COMPRESS_DEFAULT=y
CONFIG_PSTORE_COMPRESS_DEFAULT="zstd"
CONFIG_CRYPTO_ZSTD=y
CONFIG_ZSTD_COMPRESS=y
CONFIG_ZSTD_DECOMPRESS=y
CONFIG_DECOMPRESS_ZSTD=y

Also as I said, I was able to reach the emergency prompt and log as the root user in Fedora which uses btrfs and zstd as default, so the only variable should be the config and initramfs.

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#12 2021-09-15 12:07:06

seth
Member
Registered: 2012-09-03
Posts: 51,174

Re: [Solved] Keyboard not working in emergency shell

I don't quite understand why you can't load the btrfs module, but the keyboard support is likely from one of the modules in #6
The problem is that adding them to the initramfs won't necessarily achieve anything if the btrfs module in the initramfs already can't be utilized…

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

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#13 2021-09-17 07:30:24

Ayush1325
Member
From: India
Registered: 2019-09-23
Posts: 18

Re: [Solved] Keyboard not working in emergency shell

Ok, so I finally was able to solve the problem.
I just removed the old config and generated a new config from the latest config in /proc.
I still can't boot but the keyboard works and I can get to the root emergency prompt.
I think the problem might have been with the old config. I also haven't enabled any of the Rust Sample modules so that can be the case too.
Either way, thanks for all your help @seth.

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#14 2021-11-13 18:21:41

Vincy.zsh
Member
Registered: 2021-09-04
Posts: 6

Re: [Solved] Keyboard not working in emergency shell

Ayush1325 wrote:

Ok, so I finally was able to solve the problem.
I just removed the old config and generated a new config from the latest config in /proc.
I still can't boot but the keyboard works and I can get to the root emergency prompt.
I think the problem might have been with the old config. I also haven't enabled any of the Rust Sample modules so that can be the case too.
Either way, thanks for all your help @seth.

Could you say how you did it, please? I am finding a solution right now but on the normal (linux) kernel. Sorry for disturbing!

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