From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4959C37FF67 for ; Wed, 7 Oct 2026 12:32:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791376347; cv=none; b=CsMhcUhFbju73hkxRPwPJIHZbjR2JolFaRgsOd7VLUyYfBkBit20bFqke5zCB63KndkTDpN1kddHO2ShWGMFhLtEZN/M4p86wmyNhIpM4zgXb6Cn7Woqw+pooKiJvOzEFG53S+rknhBhosp656QSiDKP+czFodJyjBO9gcO4q2I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791376347; c=relaxed/simple; bh=Jc90DrgkmkCJP1d2Pn4L/y2dewlgSz0NqzIH+8ytKFA=; h=Message-ID:Date:MIME-Version:To:Cc:From:Subject:Content-Type; b=Nx6c+7vQqJUffOG1UktPBDeB+fYhfIqvZLmmGXoLvf/tOhM6TGAAT76i43CUkNAbLg7mgf8bev+GYZL/XxJlkKNgzUVCtaERgwa/Me+HSftrdZU3aCs8bEBb8MTQuFQKAoLNlEEoyH3JTMaE6NeCfnbSuRdL5Tx93/fdFu6OQ1o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=hji6i0Iw; arc=none smtp.client-ip=185.67.36.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="hji6i0Iw" Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 4469D240105 for ; Wed, 7 Oct 2026 14:32:09 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=1984.8680eb; t=1791376329; bh=fczfhEFWLc2TCU+JCu6EcM1jW34Ct6CugUZBv9ftY2Q=; h=Message-ID:Date:MIME-Version:To:Cc:From:Subject:Content-Type: Content-Transfer-Encoding:From; b=hji6i0IwhCNIupTxGau11OeLZauT6TiLfcf5zEC6RSJ3xHzuDLJRtB+EIEaMUwCsm 75xE1nIXDsk4pvsM84r+ZbnMmuKX6FMzvYa+l1eKhSZHvVTDrDUBgdIVwlmRuYp6Sw JdWnv9YYi5za6aZigq/VQpJqsa7qmc4b41sB6rF2ncOuuPUPO1ngN2tTSG0PsPYjy9 OJ3z10uujCoOOHFClKYTFIiB3KTjZEjg2+yRE561+peLftfIgJjjWhWkWM/JICX+A5 exlzaJwFqDJanM7ESEFMHthYPSme4ucWUPqP3gLfcmsJ1dpqw6yRGG0B3mqDFV++y1 BMKI6PRFMkFBw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4j0CDm1Zr6z9rxK; Wed, 7 Oct 2026 14:32:07 +0200 (CEST) Message-ID: Date: Wed, 07 Oct 2026 12:32:09 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Language: en-US, de-DE To: linux-ata@vger.kernel.org Cc: linux-kernel@vger.kernel.org, regressions@lists.linux.dev From: Hans-Joachim Lange Subject: =?UTF-8?Q?PROBLEM=3A_Kernel_6=2E8=2Ex=3A_VFS=3A_Unable_to_mount_roo?= =?UTF-8?Q?t_fs_on_unknown-block=280=2C0=29_=E2=80=93_SATA_=28Intel_AHCI=29_?= =?UTF-8?Q?not_detected?= Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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