I have done some more tests on a different computer with the same OS, this time with the following Kernel version as reported by "uname -a":
Linux <hostname> 6.5.0-15-generic #15~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Jan 12 18:54:30 UTC 2 x86_64 x86_64 x86_64 GNU/Linux I generated a reproducible pseudo-random text file in this way: ( set -o pipefail && head --bytes=$(( 55 * 1000 )) /dev/zero | openssl enc -aes-128-ctr -nosalt -pass "pass:my-seed" -iter 1 | hexdump --no- squeezing --format '40/1 "%02x"' --format '"\n"' >"testdata.txt" ) The resulting text file is around 111 kbytes long. I copied the file with 'cp' to the SMB 1.0 Windows server and back. I have attached both file versions to this bug report. Comparing the files with 'meld' yields 5 holes with binary zeros, each one exactly 3900 bytes long. This is how I located the holes on the command line: grep --perl-regexp --text --byte-offset --only-matching '\x00{3900}' testdata-back-from-server.txt | tr --delete '\000' The resulting hole offsets are: 16580 37060 57540 78020 98500 That is, the holes repeat at a fixed offset interval of 20480 bytes, that is, exactly 20 KiB. The other PC with Kernel version 6.2.0-39-generic is working fine, as it has in the past years. It would be nice if someone else could reproduce this, as it might actually be the server side, however unlikely that is. ** Attachment added: "testdata.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2049634/+attachment/5744351/+files/testdata.txt -- 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