Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.16 kernel. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance.  http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc1/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1748689 Title: Mounting SMB shares with vers=3.0 in fstab gives "ioctl error in smb2_get_dfs_refer rc=-2" Status in linux package in Ubuntu: Incomplete Bug description: Xubuntu 17.10 artful Kernel: x86_64 Linux 4.13.0-32.35-generic cifs-utils 2:6.7-1 smbclient 2:4.6.7+dfsg-1ubuntu3.1 Mounting an SMB share with sec=ntlmssp,vers=3.0,credentials=/home/.smbcredentials,dir_mode=0777,file_mode=0777 in /etc/fstab gives the error: "CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2" in dmesg. Shares mounted this way are readable, but writing data to them (or using programs such as EasyTAG to write to them) ultimately fails. This bug did not occur in kernel 4.10. Mounting the share(s) with vers=1.0 does not give the error, but this is a haphazard fix as SMB v3.0 carries many security features with it not avaliable in SMB 1.0. --- ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 CurrentDesktop: XFCE DistroRelease: Ubuntu 17.10 HibernationDevice: RESUME=/dev/mapper/DeusVitam--vg-swap_1 JournalErrors: Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system. Users in the 'systemd-journal' group can see all messages. Pass -q to turn off this notice. No journal files were opened due to insufficient permissions. MachineType: ASUS All Series Package: linux (not installed) ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic root=/dev/mapper/hostname--vg-root ro splash quiet amdgpu.cik_support=1 vt.handoff=7 ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13 RelatedPackageVersions: linux-restricted-modules-4.13.0-32-generic N/A linux-backports-modules-4.13.0-32-generic N/A linux-firmware 1.169.3 RfKill: Tags: artful Uname: Linux 4.13.0-32-generic x86_64 UpgradeStatus: Upgraded to artful on 2018-02-05 (7 days ago) UserGroups: libvirt libvirtd sudo wireshark WifiSyslog: _MarkForUpload: True dmi.bios.date: 03/16/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0701 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: Z97-E/USB 3.1 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0701:bd03/16/2016:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-E/USB3.1:rvrRevX.0x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: ASUS MB dmi.product.name: All Series dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1748689/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp