On Tue, May 05, 2020 at 11:39:14AM -0600, Jens Axboe wrote: > > > > I'll try and see if I can get an arch binary build that has the > > vfs_io_uring module and reproduce. > > Got that done, and I can now mount it on Linux. Been trying pretty > hard to trigger any corruptions on reads, but it works for me. Checked > that we see short reads, and we do, and that it handles it just fine. > So pretty blank right now on what this could be. > > FWIW, I'm mounting on Linux as: > > # mount -t cifs -o ro,guest //arch/data /smb The reporter claims this only happens with a Windows client, as the Linux and Samba libsmb clients don't pipeline the reads in the same way for multiple files the same way that Windows does. Here is the bug report with all the details I've managed to get out of the original reporter: https://bugzilla.samba.org/show_bug.cgi?id=14361 I also can't reproduce the data corruption, even from a Windows client although I've only tried so far on my home Ubuntu 19.04 kernel 5.3.0-51-generic #44-Ubuntu SMP box. I tried running 2 powershell processes on the Windows client and doing a copy in both of them to ensure we are opening multiple files simultaneously and going through the io_uring module (which I saw happening by adding debug statements) but I never see corruption. I'm planning to try running against a Fedora32 VM next, as that's case the reporter claims will reproduce the issue. Thanks for helping me look at this ! Jeremy.
