On Fri, Aug 02, 2024 at 11:44:18AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote: > Hi, Thorsten here, the Linux kernel's regression tracker. > > Paulo, I noticed a report about a regression in bugzilla.kernel.org that > appears to be caused by this change of yours: > > 3ae872de410751 ("smb: client: fix shared DFS root mounts with different > prefixes") [v6.5-rc1] > > As many (most?) kernel developers don't keep an eye on the bug tracker, > I decided to write this mail. To quote from > https://bugzilla.kernel.org/show_bug.cgi?id=219083 : > > > Gleb Korobeynikov 2024-07-22 10:59:46 UTC > > > > Windows version of SMB host: Windows Server 2022 Standard x64 > > Kernel: 6.3.13(upstream) ~~~~~~~~~~~~^~~~ Testing with same WS2022 host with 6.11.0-rc1+ > > CONFIG_CIFS_DFS_UPCALL > > > > In the function cifs_inval_name_dfs_link_error(), a check was added for tcon->origin_fullpath (3ae872de410751fe5e629e04da491a632d95201c). I believe it's unnecessary because when mounting a dfs name without ASCII characters, we always fail at this check and exit the function, leading to dfs namespaces not being mounted > > > > Steps to reproduce: > > > > 1. At Windows, create DFS namespace with name containing non-ASCII symbols (for example дфс) > > > > 2. mount -t cifs \\\\<smb_server>\\дфс /tmp/dfs -o domain=...,user=...,password=... > > > > result: > > mount error(2): No such file or directory > > Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg) > > I couldn't repro this issue. I rebuilt the cifs modules both on master and in the recent for-next@cecb49e3594c2a69163865c214b71fff26d5761d sources: $ sudo mount -t cifs //WIN-31GSG2M9E6N/дфс /mnt/utf_repro -o ` username=administrator,password=xxx $ ls -l /mnt/utf_repro total 0 -rwxr-xr-x 1 root root 0 Aug 7 15:54 hello_cifs.txt drwxr-xr-x 2 root root 0 Aug 7 15:54 test_utf8_дфс // nothing outstanding in dmesg [430885.246220] CIFS: Attempting to mount //WIN-31GSG2M9E6N/дфс Is there anything I might be missing? > > CIFS debug log: > > [Mon Jul 22 11:00:24 2024] CIFS: Status code returned 0xc0000033 STATUS_OBJECT_NAME_INVALID > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/smb2maperror.c: Mapping SMB2 status code 0xc0000033 to POSIX err -2 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/dfs_cache.c: dfs_cache_noreq_update_tgthint: path: \test.local\дфс > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses_count=2 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses ipc: \\test.local\IPC$ > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: cifs_put_tcon: tc_count=1 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: VFS: in cifs_put_tcon as Xid: 17 with uid: 0 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/smb2pdu.c: Tree Disconnect > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/fscache.c: cifs_fscache_release_super_cookie: (0x0000000000000000) > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses_count=1 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses ipc: \\DC.test.local\IPC$ > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: VFS: in __cifs_put_smb_ses as Xid: 18 with uid: 0 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/smb2pdu.c: disconnect session 00000000360c6881 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses_count=1 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: __cifs_put_smb_ses: ses ipc: \\test.local\IPC$ > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: VFS: in __cifs_put_smb_ses as Xid: 19 with uid: 0 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/smb2pdu.c: disconnect session 00000000db1ddbb6 > > [Mon Jul 22 11:00:24 2024] CIFS: fs/smb/client/connect.c: VFS: leaving cifs_mount_put_conns (xid = 13) rc = 0 > > [Mon Jul 22 11:00:24 2024] CIFS: VFS: cifs_mount failed w/return code = -2 > > And > > > Gleb Korobeynikov 2024-07-30 11:03:01 UTC > > > > (In reply to Gleb Korobeynikov from comment #5) > >> (In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from > >> comment #4) > >> > Please check if 6.10 (or 6.11-rc1 once it's out on Monday) is still > >> affected > >> > >> Alright, I will definitely check > > > > Checked on 6.11-rc1. The reproduction issue happens identically. > > See the ticket for more details. > > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) > -- > Everything you wanna know about Linux kernel regression tracking: > https://linux-regtracking.leemhuis.info/about/#tldr > If I did something stupid, please tell me, as explained on that page. > > [1] because bugzilla.kernel.org tells users upon registration their > "email address will never be displayed to logged out users" > > P.S.: let me use this mail to also add the report to the list of tracked > regressions to ensure it's doesn't fall through the cracks: > > #regzbot introduced: 3ae872de410751fe5e629e04da491a632d95201c > #regzbot title: smb: client: failure to mount DFS namespaces without > ASCII symbols > #regzbot from: Gleb Korobeynikov <gkorobeynikov@xxxxxxxxxxxxx> > #regzbot duplicate: https://bugzilla.kernel.org/show_bug.cgi?id=219083 > #regzbot ignore-activity > Thanks, Nandaa