The "EXT4 Corruption Issue" Has Been Fixed In Linux 4.20, Backport Pending To 4.19
The EXT4 file-system corruption issue on Linux 4.19 that also affected 4.20 development builds is now case closed for this pesky data corruption issue.
As outlined yesterday, this "EXT4 file-system corruption problem" was actually an issue in the BLK-MQ code within the kernel's block subsystem. That article yesterday has more background information and that problem in the multi-queue block I/O code indeed turned out to be what was causing the problem that's been happening going back to Linux 4.19-rc1 and persisting through the various Linux 4.19 point releases and also Linux 4.20 Git. Disks on Linux 4.19+ were only vulnerable if using BLK-MQ and using no I/O scheduler.
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