I can reproduce this now with a simple smb1 cp - but only with the small wsize ie mount option: wsize=16850. As mentioned earlier the problem is that we see a 16K write, then the next write is at the wrong offset (leaving a hole) (it worked for SMB1 with default wsize) so focus is on these two functions in the call stack: [19085.611988] cifs_async_writev+0x90/0x380 [cifs] [19085.612083] cifs_writepages_region+0xadc/0xbb0 [cifs] On Mon, Feb 5, 2024 at 3:37 AM R. Diez <rdiez-2006@xxxxxxx> wrote: > > > >> Unlikely as you didn't take them for the last merge window, let alone 6.2. > > > > That said, you did take my iteratorisation patches in 6.3 - but that shouldn't > > affect 6.2 unless someone backported them. > > Please note that 6.2 is not affected, the breakage occurred afterwards. See the bug report here for more information: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2049634 > > Regards, > rdiez > -- Thanks, Steve