PROBLEM: Kernel 6.8.x: VFS: Unable to mount root fs on unknown-block(0,0) – SATA (Intel AHCI) not detected
From: Hans-Joachim Lange
Date: Wed Oct 07 2026 - 09:19:41 EST
Hello,
I am experiencing a regression: kernel 5.15.x boots fine, but 6.8.x
fails with "Kernel panic - not syncing: VFS: Unable to mount root fs
on unknown-block(0,0)". The SATA controller (Intel, rev 06) is not
detected; /dev/sda never appears. The ahci module is present in the
initramfs but does not load.
[1.] One line summary:
Kernel 6.8.x fails to detect Intel SATA AHCI controller; /dev/sda not created.
[2.] Full description:
On a [Laptop-Modell], Linux Mint 21.x, kernel 5.15.x boots normally.
Kernel 6.8.x panics during initramfs: "VFS: Unable to mount root fs
on unknown-block(0,0)". The initramfs contains ahci.ko, sd_mod.ko,
libahci.ko, libata.ko (verified with lsinitramfs). No shell is
reachable (break=bottom, rdinit=/usr/bin/sh both fail). Secure Boot
was disabled during testing.
[3.] Keywords:
ahci, sata, ata, initramfs, boot, regression
[4.] Kernel version:
Working: 5.15.0-xx-generic
Broken: 6.8.0-xx-generic
[5.] Oops/Panic message:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[7.] Environment:
Distro: Linux Mint 21.x (Ubuntu 22.04 based)
Arch: x86_64
Controller: Intel Corporation [SATA controller] (rev 06)
Kernel driver in use (on 5.15): ahci
lspci -k output:
00:00.0 Host bridge: Intel Corporation Gemini Lake Host Bridge (rev 06)
DeviceName: Onboard - Other
00:00.1 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Dynamic Platform and Thermal Framework Processor Participant (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Dynamic Platform and Thermal Framework Processor Participant
Kernel driver in use: proc_thermal
Kernel modules: processor_thermal_device_pci_legacy
00:02.0 VGA compatible controller: Intel Corporation GeminiLake [UHD Graphics 600] (rev 06)
DeviceName: Onboard - Video
Kernel driver in use: i915
Kernel modules: i915
00:0e.0 Multimedia audio controller: Intel Corporation Celeron/Pentium Silver Processor High Definition Audio (rev 06)
DeviceName: Onboard - Sound
Subsystem: Realtek Semiconductor Co., Ltd. Celeron/Pentium Silver Processor High Definition Audio
Kernel driver in use: sof-audio-pci-intel-apl
Kernel modules: snd_hda_intel, snd_soc_skl, snd_sof_pci_intel_apl
00:0f.0 Communication controller: Intel Corporation Celeron/Pentium Silver Processor Trusted Execution Engine Interface (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Trusted Execution Engine Interface
Kernel driver in use: mei_me
Kernel modules: mei_me
00:12.0 SATA controller: Intel Corporation Celeron/Pentium Silver Processor SATA Controller (rev 06)
DeviceName: Onboard - SATA
Subsystem: Intel Corporation Celeron/Pentium Silver Processor SATA Controller
Kernel driver in use: ahci
Kernel modules: ahci
00:13.0 PCI bridge: Intel Corporation Gemini Lake PCI Express Root Port (rev f6)
Subsystem: Intel Corporation Gemini Lake PCI Express Root Port
Kernel driver in use: pcieport
00:14.0 PCI bridge: Intel Corporation Gemini Lake PCI Express Root Port (rev f6)
Subsystem: Intel Corporation Gemini Lake PCI Express Root Port
Kernel driver in use: pcieport
00:15.0 USB controller: Intel Corporation Celeron/Pentium Silver Processor USB 3.0 xHCI Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor USB 3.0 xHCI Controller
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:16.0 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 0 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 0
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:16.1 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 1 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 1
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:16.2 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 2 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 2
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:16.3 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 3 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 3
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:17.0 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 4 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 4
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:17.1 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 5 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 5
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:17.2 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 6 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 6
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:17.3 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor I2C 7 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor I2C 7
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:18.0 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:18.1 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:18.2 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:18.3 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO UART Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:19.0 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:19.1 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:19.2 Signal processing controller: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Serial IO SPI Host Controller
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:1c.0 SD Host controller: Intel Corporation Celeron/Pentium Silver Processor SDA Standard Compliant SD Host Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor SDA Standard Compliant SD Host Controller
Kernel driver in use: sdhci-pci
Kernel modules: sdhci_pci
00:1e.0 SD Host controller: Intel Corporation Device 31d0 (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Device 7270
Kernel driver in use: sdhci-pci
Kernel modules: sdhci_pci
00:1f.0 ISA bridge: Intel Corporation Celeron/Pentium Silver Processor LPC Controller (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor LPC Controller
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.1 SMBus: Intel Corporation Celeron/Pentium Silver Processor Gaussian Mixture Model (rev 06)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Celeron/Pentium Silver Processor Gaussian Mixture Model
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
Subsystem: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
Kernel modules: rtw88_8821ce, rtw_8821ce, 8821ce
dmesg | grep -iE "ata|sata|ahci" (on 5.15.x):
[ 0.000000] BIOS-e820: [mem 0x000000006dd70000-0x000000006dd80fff] ACPI data
[ 0.000000] reserve setup_data: [mem 0x0000000000000000-0x000000000003efff] usable
[ 0.000000] reserve setup_data: [mem 0x000000000003f000-0x000000000003ffff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000000040000-0x000000000009dfff] usable
[ 0.000000] reserve setup_data: [mem 0x000000000009e000-0x00000000000fffff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000000100000-0x000000000fffffff] usable
[ 0.000000] reserve setup_data: [mem 0x0000000010000000-0x0000000012150fff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000012151000-0x00000000607a9017] usable
[ 0.000000] reserve setup_data: [mem 0x00000000607a9018-0x00000000607b9057] usable
[ 0.000000] reserve setup_data: [mem 0x00000000607b9058-0x000000006b4bbfff] usable
[ 0.000000] reserve setup_data: [mem 0x000000006b4bc000-0x000000006dd6ffff] reserved
[ 0.000000] reserve setup_data: [mem 0x000000006dd70000-0x000000006dd80fff] ACPI data
[ 0.000000] reserve setup_data: [mem 0x000000006dd81000-0x000000006dde0fff] ACPI NVS
[ 0.000000] reserve setup_data: [mem 0x000000006dde1000-0x000000006e1e6fff] reserved
[ 0.000000] reserve setup_data: [mem 0x000000006e1e7000-0x000000006ea3cfff] usable
[ 0.000000] reserve setup_data: [mem 0x000000006ea3d000-0x000000006ea3dfff] ACPI NVS
[ 0.000000] reserve setup_data: [mem 0x000000006ea3e000-0x000000006ea3ffff] reserved
[ 0.000000] reserve setup_data: [mem 0x000000006ea40000-0x000000006eb14fff] usable
[ 0.000000] reserve setup_data: [mem 0x000000006eb15000-0x000000006ebc4fff] reserved
[ 0.000000] reserve setup_data: [mem 0x000000006ebc5000-0x000000006effffff] usable
[ 0.000000] reserve setup_data: [mem 0x000000006f000000-0x000000007fffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000d0000000-0x00000000d0ffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000d3709000-0x00000000d3709fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000e0000000-0x00000000efffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fe042000-0x00000000fe044fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fe900000-0x00000000fe902fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fed01000-0x00000000fed01fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000ff800000-0x00000000ffffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000100000000-0x00000001ffffffff] usable
[ 0.024880] NODE_DATA(0) allocated [mem 0x1fffd6000-0x1ffffffff]
[ 0.203122] Memory: 5547680K/5931444K available (16393K kernel code, 4402K rwdata, 11004K rodata, 3296K init, 18764K bss, 383508K reserved, 0K cma-reserved)
[ 0.370364] Register File Data Sampling: Mitigation: Clear Register File
[ 0.718375] ACPI: EC: EC_CMD/EC_SC=0x66, EC_DATA=0x62
[ 0.932015] ACPI: EC: EC_CMD/EC_SC=0x66, EC_DATA=0x62
[ 0.932228] libata version 3.00 loaded.
[ 1.936203] Write protecting the kernel read-only data: 30720k
[ 1.936858] Freeing unused kernel image (text/rodata gap) memory: 2036K
[ 1.937125] Freeing unused kernel image (rodata/data gap) memory: 1284K
[ 2.238334] ahci 0000:00:12.0: version 3.0
[ 2.249922] ahci 0000:00:12.0: AHCI 0001.0301 32 slots 2 ports 6 Gbps 0x3 impl SATA mode
[ 2.249929] ahci 0000:00:12.0: flags: 64bit ncq sntf pm clo only pmp pio slum part deso sadm sds apst
[ 2.256735] scsi host0: ahci
[ 2.260141] scsi host1: ahci
[ 2.260198] ata1: SATA max UDMA/133 abar m2048@0x80040000 port 0x80040100 irq 124
[ 2.260204] ata2: SATA max UDMA/133 abar m2048@0x80040000 port 0x80040180 irq 124
[ 2.575597] ata2: SATA link down (SStatus 4 SControl 300)
[ 2.737540] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 2.739515] ata1.00: ATA-9: SSD 1TB, X0606B0, max UDMA/133
[ 2.740480] ata1.00: 1953525168 sectors, multi 1: LBA48 NCQ (depth 32), AA
[ 2.744572] ata1.00: configured for UDMA/133
[ 2.745087] scsi 0:0:0:0: Direct-Access ATA SSD 1TB 6B0 PQ: 0 ANSI: 5
[ 6.125323] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
[ 7.231564] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 7.253660] systemd[1]: systemd-hwdb-update.service - Rebuild Hardware Database was skipped because of an unmet condition check (ConditionNeedsUpdate=/etc).
[ 9.645970] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
[X.] Notes:
- ahci.ko is present in initramfs but not loaded
- No initramfs shell reachable (break=bottom, rdinit both fail)
- Secure Boot disabled during testing
- First broken kernel: 6.x.x (if known)
- Last working kernel: 5.15.x
Thank you