Public bug reported:
The boot process stops in BusyBox initramfs with:
Gave up waiting for root file system device.
ALERT! UUID=3b576797-6d3e-400a-b1a2-e6034a7a5e64 does not exist.
(initramfs)
The same machine boots correctly with Linux 6.14.0-37-generic.
Hardware
Model
Apple iMac16,1
CPU
Intel Broadwell
Storage controller
Intel Wildcat Point-LP SATA Controller
PCI ID: 8086:9c83
Kernel driver: ahci
Filesystem
Root filesystem:
/dev/sda4
UUID=3b576797-6d3e-400a-b1a2-e6034a7a5e64
Distribution
Linux Mint 22.3
Ubuntu 24.04 (Noble) base
Working kernels
6.14.0-37-generic
6.14.11-imac16 (custom)
Both kernels boot normally.
Broken kernel
7.0.0-28-generic
Never reaches userspace.
Always drops into BusyBox initramfs.
Boot error
Gave up waiting for root file system device.
ALERT! UUID=3b576797-6d3e-400a-b1a2-e6034a7a5e64 does not exist.
(initramfs)
The attached photo shows the complete boot failure.
Tests already performed
Root filesystem
Verified.
UUID matches /dev/sda4
GRUB
Verified.
Correct root UUID is passed to the kernel.
initramfs
Regenerated successfully
sudo update-initramfs -u -k 7.0.0-28-generic
No errors.
initramfs configuration
MODULES=most
AHCI
Present inside initramfs.
ahci
libahci
Built-in drivers
Verified:
libata
sd_mod
xhci_pci
xhci_hcd
Installed packages
Verified.
linux-image-7.0.0-28-generic
linux-modules-7.0.0-28-generic
Both installed correctly.
Kernel configuration
Verified.
CONFIG_BLK_DEV_SD=y
CONFIG_USB_XHCI_PCI=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_SATA_AHCI=m
Additional tests
Performed:
rootdelay=10
No change.
Still fails with
ALERT! UUID does not exist
USB keyboard
Apple USB keyboard is detected normally under Linux 6.14.
Inside BusyBox initramfs of Linux 7.0.0-28 it is not usable.
Regression
Linux 6.14.0-37-generic:
Boots successfully.
Linux 7.0.0-28-generic:
Always fails before mounting the root filesystem.
This appears to be a regression introduced between Linux 6.14 and Linux
7.0 on Apple iMac16,1 hardware.
Additional information
The system also has a separate ALSA bug regarding the CS4208 audio codec
(Kernel Bugzilla #221835).
This boot failure is independent of the audio issue.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "boot failure"
https://bugs.launchpad.net/bugs/2163026/+attachment/5990301/+files/IMG_7895.jpeg
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https://bugs.launchpad.net/bugs/2163026
Title:
Linux 7.0.0-28-generic consistently fails to boot on an Apple iMac16,1
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