Hi. I got a machine to work on this. Based on comment 1, I understand this is ppc64le, not ppc64, correct? > actually already the liburing embedded testsuite is failing on ppc64le. Dirk, I know this was quite a while, but was the testsuite running on the host or the VM? We've got quite a few fixes to io_uring on SP4 since last year. I'll try reproduce both the testsuite error and the fio corruption and report back. this might be already fixed.