Public bug reported:
SUMMARY
Ubuntu 26.04 (kernel 7.0.0-30-generic) causes reproducible SATA I/O
errors and data corruption on Gigabyte GA-H97-D3H motherboards. The
problem disappears when limiting the maximum I/O request size using
libata.force=max_sec=2560.
HARDWARE
Motherboard: Gigabyte GA-H97-D3H, BIOS F5
SATA controller: Intel H97 AHCI (8086:8c82), driver ahci
SSD: Crucial MX100 256 GB (also reproduced with Samsung 870 EVO)
Filesystem: ext4 on LVM on LUKS
REPRODUCTION
Boot Ubuntu 26.04 with kernel 7.0.0-30-generic (default parameters).
On a disposable ext4 filesystem mounted at /target, run:
fio --name=installer-like
--filename=/target/var/tmp/fio-test.bin
--rw=write --bs=4M
--ioengine=sync --direct=0
--size=16G --fsync=16
--end_fsync=1 --group_reporting
A/B TEST RESULTS
Without workaround:
max_sectors_kb = 4096
FAIL after 128 MiB (5.7 seconds)
fio reports EIO during fsync.
Kernel reports Intel DMAR/IOMMU faults for PCI device 00:1f.2, followed by
SATA ICRC/handshake errors, failed WRITE FPDMA QUEUED commands and ext4 I/O
errors.
SMART UDMA_CRC_Error_Count increased from 37 to 44.
With libata.force=max_sec=2560:
max_sectors_kb = 1280
PASS: 16 GiB written in 84.7 seconds, no I/O errors.
Both tests used the same kernel, hardware, filesystem and fio command.
ADDITIONAL OBSERVATIONS
- Ubuntu 26.04 installation repeatedly fails on this hardware without the
workaround, but completes successfully with it.
- Reproduced on three identical Gigabyte motherboards, using different SSDs,
SATA cables and power supplies.
- Ubuntu 24.04 with kernel 6.8 installs successfully.
- Large direct-I/O fio and sequential dd tests did not reproduce the error.
- The failing kernel log shows 4 MiB ATA DMA writes and DMAR faults immediately
preceding SATA errors.
The results suggest a regression involving large I/O requests and
possibly Intel IOMMU/DMA mapping.
Full dmesg, SMART, lspci and fio logs for both test configurations are
attached.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "failure-dmesg.log"
https://bugs.launchpad.net/bugs/2171415/+attachment/6010660/+files/failure-dmesg.log
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https://bugs.launchpad.net/bugs/2171415
Title:
[Regression] Intel H97 SATA I/O errors and DMAR faults with kernel
7.0, avoided by libata.force=max_sec=2560
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