I have bisected the issue, and found the commit that introduces the problem: commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 Author: David Howells <dhowells@xxxxxxxxxx> Date: Mon Jan 24 21:13:24 2022 +0000 Subject: cifs: Change the I/O paths to use an iterator rather than a page list Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d08089f649a0cfb2099c8551ac47eef0cc23fdf2 $ git describe --contains d08089f649a0cfb2099c8551ac47eef0cc23fdf2 v6.3-rc1~136^2~7 David, I also tried your cifs-netfs tree available here: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=cifs-netfs This tree solves the issue. Specifically: commit 34efb2a814f1882ddb4a518c2e8a54db119fd0d8 Author: David Howells <dhowells@xxxxxxxxxx> Date: Fri Oct 6 18:29:59 2023 +0100 Subject: cifs: Cut over to using netfslib Link: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?h=cifs-netfs&id=34efb2a814f1882ddb4a518c2e8a54db119fd0d8 This netfslib work looks like quite a big refactor. Is there any plans to land this in 6.8? Or will this be 6.9 / later? Do you have any suggestions on how to fix this with a smaller delta in 6.3 -> 6.8-rc3 that the stable kernels can use? Thanks, Matthew
