Not sure why mailing list to direct this bug report to, so starting with libata based on the error messages. Some where between v4.12 and 4.13.0-rc6 a Celestica redstone switch fails to boot due to ATA errors: [ 9.185203] ata1.00: failed to set xfermode (err_mask=0x40) [ 9.500825] ata1.00: revalidation failed (errno=-5) [ 20.449205] ata1.00: failed to set xfermode (err_mask=0x40) I just tried Linus' top of tree (cc4a41fe5541) and it still fails. With v4.12 the same switch boots and 'dmesg | grep ata' shows: [ 0.129080] libata version 3.00 loaded. [ 1.016520] ata1: SATA max UDMA/133 abar m2048@0xdffce000 port 0xdffce100 irq 27 [ 1.016524] ata2: SATA max UDMA/133 abar m2048@0xdffce000 port 0xdffce180 irq 27 [ 1.016528] ata3: SATA max UDMA/133 abar m2048@0xdffce000 port 0xdffce200 irq 27 [ 1.016531] ata4: SATA max UDMA/133 abar m2048@0xdffce000 port 0xdffce280 irq 27 [ 1.028623] ata5: SATA max UDMA/133 abar m2048@0xdffcd000 port 0xdffcd100 irq 28 [ 1.028627] ata6: SATA max UDMA/133 abar m2048@0xdffcd000 port 0xdffcd180 irq 28 [ 1.326767] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 1.328646] ata2: SATA link down (SStatus 0 SControl 300) [ 1.330519] ata4: SATA link down (SStatus 0 SControl 300) [ 1.330554] ata3: SATA link down (SStatus 0 SControl 300) [ 1.330575] ata1.00: ATA-9: InnoDisk Corp. - mSATA 3ME, S130604, max UDMA/133 [ 1.330581] ata1.00: 31277232 sectors, multi 16: LBA48 NCQ (depth 31/32), AA [ 1.332433] ata1.00: failed to get Identify Device Data, Emask 0x1 [ 1.332709] ata1.00: failed to get Identify Device Data, Emask 0x1 [ 1.332717] ata1.00: configured for UDMA/133 [ 1.335813] ata6: SATA link down (SStatus 0 SControl 300) [ 1.339829] ata5: SATA link down (SStatus 0 SControl 300) Given the overhead of building, installing, booting and recovering from a failed boot, 'git bisect' is not a realistic option for this switch option unless some one can cut the span to a few iterations. If it helps, lspci and lsscsi output from an older kernel: # lspci 00:00.0 Host bridge: Intel Corporation Atom processor C2000 SoC Transaction Router (rev 02) 00:01.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root Port 1 (rev 02) 00:02.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root Port 2 (rev 02) 00:03.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root Port 3 (rev 02) 00:0e.0 Host bridge: Intel Corporation Atom processor C2000 RAS (rev 02) 00:0f.0 IOMMU: Intel Corporation Atom processor C2000 RCEC (rev 02) 00:13.0 System peripheral: Intel Corporation Atom processor C2000 SMBus 2.0 (rev 02) 00:14.0 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03) 00:14.1 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03) 00:14.2 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03) 00:16.0 USB controller: Intel Corporation Atom processor C2000 USB Enhanced Host Controller (rev 02) 00:17.0 SATA controller: Intel Corporation Atom processor C2000 AHCI SATA2 Controller (rev 02) 00:18.0 SATA controller: Intel Corporation Atom processor C2000 AHCI SATA3 Controller (rev 02) 00:1f.0 ISA bridge: Intel Corporation Atom processor C2000 PCU (rev 02) 00:1f.3 SMBus: Intel Corporation Atom processor C2000 PCU SMBus (rev 02) 01:00.0 Ethernet controller: Broadcom Corporation Device b854 (rev 03) # lsscsi [0:0:0:0] disk ATA InnoDisk Corp. - 604 /dev/sda -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html