I just realised that the offset to the first hole matches the default wsize=16580 argument for SMB 1.0 mounts, or at least that is what "mount -l" reports.
That is, cifs is writing each time wsize bytes with the right data + a hole of 3900 bytes made of binary zeros. And the next blocks look the same: wsize bytes with the right data + a hole of 3900 bytes each time. As noted above, the distance between the "wsize + hole" areas is 20480, which is wsize=16580 + the hole size of 3900 bytes. For the record, the connection is using RawNTLMSSP, documented as "NTLMSSP without SPNEGO, NTLMv2 hash". -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2049634 Title: SMB 1 broken in kernel 6.5.0.14.14~22.04.7 Status in linux package in Ubuntu: New Status in linux source package in Mantic: New Bug description: Hi all: I upgraded my Ubuntu yesterday and automatically got the newer Linux Kernel version 6.5.0-14-generic #14~22.04.1-Ubuntu. Previously, I was running kernel version 6.2 . I still have a legacy system on the network using SMB protocol version 1.0. With the new kernel version, copying files does not work reliably anymore. Some random byte blocks in the destination files are overwritten with binary zeros. It happens quite often. This is not the first time the Linux guys temporarily break SMB protocol version 1.0, see for example this bug report of mine: https://bugs.launchpad.net/ubuntu/+bug/2033732 I checked package linux-image-generic-hwe-22.04 with Synaptic, and now it lists just 2 versions: 6.5.0.14.14~22.04.7 (jammy-updates) 5.15.0.25.27 (jammy) Is there a way to go back to the latest 6.2 kernel version? How do I prevent Ubuntu from upgrading to 6.5 next time around? I have searched the Internet, but I haven't found yet a usable answer. I don't want to go back all the way to Kernel 5.15 if I can avoid it. Thanks in advance, rdiez To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2049634/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
