Hi all, Using torvalds master, I recently encountered data corruption on my ext4 volume on LUKS on NVMe. Specifically, during heavy writes, the system partially hangs; SysRq-W shows that processes are blocked in the kernel on I/O. After forcibly rebooting, chunks of files are replaced with other, unrelated data. I'm not sure exactly what the data is; some of it is unknown binary data, but in at least one case, a list of file paths was inserted into a file, indicating that the data is misdirected after encryption. This issue appears to affect files receiving writes in the temporal vicinity of the hang, but affects both new and old data: for example, my shell history file was corrupted up to many months before. The drive reports no SMART issues. I believe this is a regression in the kernel related to something merged in the last few days, as it consistently occurs with my most recent kernel versions, but disappears when reverting to an older kernel. I haven't investigated further, such as by bisecting. I hope this is sufficient information to give someone a lead on the issue, and if it is a bug, nail it down before anybody else loses data. Regards, Alex.
