F42 Boot Issues after updating Kernel

Ask Fedora
1

I’m experiencing a persistent boot issue on Fedora 42. I haven’t been able to boot into any kernels newer than 6.14.9. Whenever I try to boot with a more recent kernel (e.g., 6.14.11, 6.15.4, 6.15.5), the system drops into emergency mode. The 6.14.9 kernel still boots fine.

boot-error
boot-error1920×2250 889 KB

Any help or insights would be greatly appreciated!

2

It seems something is wrong with your disk.
The kernel is timing out looking for the root file system.

Can you boot your system from a live usb image?
If so you can investigate what is wrong.

3

I can boot to into kernel 6.14.9 without any issues and the system works perfectly fine with no disk problems. Any kernel I update to after 6.14.9 is when the time out occurs and dumps me into emergency mode. Not sure what would cause that.

I’ve been running Fedora on this system since 36 and never had any issues with updating kernels until now.

4

What does lsblk -f report?
What does cat /proc/cmdline show?

I am wondering is there is issue between kernel options and your partitions.

5

Here are the command outputs:

lsblk -f
NAME        FSTYPE FSVER LABEL                 UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
zram0       swap   1     zram0                 e246b8cd-f962-4af2-974b-5be35b01def1                [SWAP]
nvme0n1                                                                                            
├─nvme0n1p1 vfat   FAT16                       1384-FFFC                             171.9M    38% /boot/efi
├─nvme0n1p2 ext4   1.0                         0cf10e99-dea7-4d3d-a563-0238c94d747a  543.6M    37% /boot
├─nvme0n1p3 ntfs         OS                    FCD816DDD816964C                                    
├─nvme0n1p4 ntfs         WINRETOOLS            B672D49A72D46123                                    
├─nvme0n1p5 ntfs         Image                 CE76D4B176D49B91                                    
├─nvme0n1p6 ntfs         DELLSUPPORT           EC168A50168A1C28                                    
└─nvme0n1p7 btrfs        fedora_localhost-live 93a8adfa-36a2-4863-b54f-68ed36e1333c    118G    62% /home
                                                                                                   /


cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-6.14.9-300.fc42.x86_64 root=UUID=93a8adfa-36a2-4863-b54f-68ed36e1333c ro rootflags=subvol=root rhgb quiet

Here is the /etc/fstab

UUID=93a8adfa-36a2-4863-b54f-68ed36e1333c /                       btrfs   subvol=root     0 0
UUID=0cf10e99-dea7-4d3d-a563-0238c94d747a /boot                   ext4    defaults        1 2
UUID=1384-FFFC          /boot/efi               vfat    umask=0077,shortname=winnt 0 2
UUID=93a8adfa-36a2-4863-b54f-68ed36e1333c /home                   btrfs   subvol=home     0 0
6

That seems okay.

Check that the new kernel is using the same kernel command line as the working kernel.

7

I’ve got it working now. Thanks Barry for getting me steered in the right direction. Here is what I did to fix:

  1. Updated to the most recent kernel 6.15.5
  2. Rebuilt the grub config: grub2-mkconfig -o /boot/grub2/grub.cfg
  3. Rebooted