Many thanks for investigating. Yes, this does appear to be fixed in 4.15.0-144-generic
-- Chris Ritson Newcastle University IT Service - School of Computing. Working mostly from home due to 25% occupancy target for Urban Sciences Building: https://www.ncl.ac.uk/itservice/remoteworking/ ________________________________________ From: boun...@canonical.com <boun...@canonical.com> on behalf of Matthew Ruffell <1930...@bugs.launchpad.net> Sent: 03 June 2021 04:57 To: Chris Ritson Subject: [Bug 1930603] Re: mount.cifs fails to mount DFS shares ⚠ External sender. Take care when opening links or attachments. Do not provide your login details. Hi Chris, Thanks for reporting! Looking at the difference between 4.15.0-142-generic and 4.15.0-143-generic, there is one commit: ubuntu-bionic$ git log --grep "cifs" Ubuntu-4.15.0-142.146..Ubuntu-4.15.0-143.147 commit 7dd995facbb57b35b10715a27e252c8af5a39a6c Author: Shyam Prasad N <spra...@microsoft.com> Date: Thu Feb 11 03:26:54 2021 -0800 cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath. BugLink: https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fbugs%2F1919380&data=04%7C01%7CChris.Ritson%40newcastle.ac.uk%7Cf393674c32b74f499e3e08d92644d8d4%7C9c5012c9b61644c2a91766814fbe3e87%7C1%7C0%7C637582900140610302%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=3a75bQX1lX7Ez1ukWckbpGQff8sGH3qTWje%2FxCaY93E%3D&reserved=0 [ Upstream commit a738c93fb1c17e386a09304b517b1c6b2a6a5a8b ] While debugging another issue today, Steve and I noticed that if a subdir for a file share is already mounted on the client, any new mount of any other subdir (or the file share root) of the same share results in sharing the cifs superblock, which e.g. can result in incorrect device name. While setting prefix path for the root of a cifs_sb, CIFS_MOUNT_USE_PREFIX_PATH flag should also be set. Without it, prepath is not even considered in some places, and output of "mount" and various /proc/<>/*mount* related options can be missing part of the device name. Signed-off-by: Shyam Prasad N <spra...@microsoft.com> Reviewed-by: Aurelien Aptel <aap...@suse.com> Signed-off-by: Steve French <stfre...@microsoft.com> Signed-off-by: Sasha Levin <sas...@kernel.org> Signed-off-by: Kamal Mostafa <ka...@canonical.com> Signed-off-by: Kelsey Skunberg <kelsey.skunb...@canonical.com> This has caused problems before, in bug 1923670, where we wrote to upstream and had it reverted from upstream -stable and reverted it from our kernels. Having a look through the git history, I see the revert actually landed in 4.15.0-144-generic, which has just landed in -updates (but not quite yet in -security). $ git log --grep "cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath." origin/master-next commit 9f5e9a8722e0a6d1bf46a689ba4541e4377c4b0b Author: Greg Kroah-Hartman <gre...@linuxfoundation.org> Date: Mon Apr 12 09:56:57 2021 +0200 Revert "cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath." BugLink: https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fbugs%2F1926808&data=04%7C01%7CChris.Ritson%40newcastle.ac.uk%7Cf393674c32b74f499e3e08d92644d8d4%7C9c5012c9b61644c2a91766814fbe3e87%7C1%7C0%7C637582900140610302%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=YGZSXrerrTJlSPyCf6P3jg1WIiPLJaG8Bk%2Bf0zCqY6w%3D&reserved=0 This reverts commit ad48c641e7c344ae7aba243d3056a22eaba71bfd which is commit a738c93fb1c17e386a09304b517b1c6b2a6a5a8b upstream. It is reported to cause problems in older kernels, so revert it for now until we can figure it out... Reported-by: Salvatore Bonaccorso <car...@debian.org> Link: https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2FYG7r0UaivWZL762N%40eldamar.lan&data=04%7C01%7CChris.Ritson%40newcastle.ac.uk%7Cf393674c32b74f499e3e08d92644d8d4%7C9c5012c9b61644c2a91766814fbe3e87%7C1%7C0%7C637582900140610302%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=nyKOGehTRXTa5LXaFJPOxJrvTqm4GC91uNmMVmDLbSs%3D&reserved=0 Cc: Shyam Prasad N <spra...@microsoft.com> Cc: Aurelien Aptel <aap...@suse.com> Cc: Steve French <stfre...@microsoft.com> Cc: Sasha Levin <sas...@kernel.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> Signed-off-by: Kamal Mostafa <ka...@canonical.com> Signed-off-by: Stefan Bader <stefan.ba...@canonical.com> $ git describe --contains 9f5e9a8722e0a6d1bf46a689ba4541e4377c4b0b Ubuntu-4.15.0-144.148~25 Could you please try 4.15.0-144-generic and let me know if it fixes it for you? It should be fixed there. Thanks, Matthew -- You received this bug notification because you are subscribed to the bug report. https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fbugs%2F1930603&data=04%7C01%7CChris.Ritson%40newcastle.ac.uk%7Cf393674c32b74f499e3e08d92644d8d4%7C9c5012c9b61644c2a91766814fbe3e87%7C1%7C0%7C637582900140610302%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GX360F6o6Tu%2FLZnI%2FD0%2FPL9T5Z2yras8SiWjaPzA1cs%3D&reserved=0 Title: mount.cifs fails to mount DFS shares Status in linux package in Ubuntu: New Bug description: Since the release of the latest kernel (vmlinuz-4.15.0-143-generic), a cifs mount like this fails:- mount.cifs --verbose -o 'user=XXX,dom=DOMAIN,vers=3.0,uid=XXX' '//DOMAIN.f.q.d.n/SHARE/FOLDER' /tmp/mount-point Dropping back to the previous kernel (vmlinuz-4.15.0-142-generic) or locating the DFS share on a windows box and picking its currently active member server both appear to be ways of working-around this particular fault. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-143-generic 4.15.0-143.147 ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18 Uname: Linux 4.15.0-143-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.24 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Wed Jun 2 16:55:59 2021 HibernationDevice: RESUME=/dev/mapper/vg--workstation-swap_1 IwConfig: ens160 no wireless extensions. lo no wireless extensions. ens192 no wireless extensions. Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: VMware, Inc. VMware Virtual Platform ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-143-generic root=/dev/mapper/vg--workstation-root ro quiet splash PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.15.0-143-generic N/A linux-backports-modules-4.15.0-143-generic N/A linux-firmware 1.173.19 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/12/2018 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. To manage notifications about this bug go to: https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fubuntu%2F%2Bsource%2Flinux%2F%2Bbug%2F1930603%2F%2Bsubscriptions&data=04%7C01%7CChris.Ritson%40newcastle.ac.uk%7Cf393674c32b74f499e3e08d92644d8d4%7C9c5012c9b61644c2a91766814fbe3e87%7C1%7C0%7C637582900140610302%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=wQN9mtgIYGcHGNF6z64rzMHDW%2B59LBSphZhoJOMhdM4%3D&reserved=0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1930603 Title: mount.cifs fails to mount DFS shares To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1930603/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
