[Samba] Empty folder deletion issue - Samba 4.15 thru 4.18

CaptainTrips28 captaintrips28 at gmail.com
Fri Mar 17 18:43:05 UTC 2023


So the filesystem thing is a bit detailed. It's Windows client ----> RHEL
Samba server ----> Hadoop data cluster via NFS mount.


The backend filesystem on the datastorage is HDFS. It's technically a
proprietary implementation of HPE MapR (ezmerald data fabric) but it's just
a Hadoop setup at heart.

This datastorage cluster is mounted through a provided HPE/MapR loopback
NFS agent on our RHEL 7/8 samba servers (which they themselves are using
XFS). The NFSv3 mount point for each directory is shared out through the
Samba share path.

Yes... I know. NFS mount points being shared out through Samba is not
recommended. However, we don't have any other option as of current (FUSE
isn't supported yet with our encryption agent quite yet). It has however
worked relatively issue-free (aside from not being able to use ACL's and
some occasional ".nfs silly renames" lock file issues).


I've sanitized the smb.conf and narrowed it down to one share (there's
multiple, but they all use the same options)


[global]

workgroup = FOO

security = ads

passdb backend = tdbsam

kerberos method = secrets and keytab

dedicated keytab file = /etc/krb5.keytab

winbind refresh tickets = yes

#winbind offline logon = no

template homedir = /home/%U@%D

template shell = /bin/bash

realm = FOO.BAR.NET

password server = DCTESTSERVER.FOO.BAR.NET

idmap config FOO.BAR.NET : range = 1610000000 - 1620000000

idmap config FOO.BAR.NET : backend = ad

idmap config FOO.BAR.NET : schema_mode = rfc2307

idmap config * : range = 10000-999999

idmap config * : backend = tdb

winbind use default domain = no

winbind enum groups = yes

winbind enum users = yes



#current testing settings below for performance tuning

winbind max domain connections = 25

#winbind nested  groups = no

winbind reconnect delay = 5

winbind request timeout = 120

name resolve order = host lmhosts bcast









[NAME-OF-SHARE-PATH]

        path = /mapr/prod/NAME/OF/SHARE/PATH

        writable = yes

        browsable= yes

        create mask = 0770

        force create mode = 0770

        directory mask = 0775

        hide unreadable = yes

        force group = "FOO\groupname"

        valid users = +foo.bar.net\"groupname"


On Wed, Mar 15, 2023, 1:41 PM Jeremy Allison via samba <
samba at lists.samba.org> wrote:

> On Wed, Mar 15, 2023 at 04:53:16PM +0000, Rowland Penny via samba wrote:
> >
> >
> >On 15/03/2023 16:47, Jeremy Allison via samba wrote:
> >>On Wed, Mar 15, 2023 at 11:29:10AM -0400, CaptainTrips28 via samba wrote:
> >>>Encountering a strange one... has been occuring since samba 4.15.x and
> >>>continues to occur even in 4.17.5 and 4.18
> >>>
> >>>Issue does not occur in earlier versions (4.13.x) and have switched back
> >>>and forth between versions to confirm.
> >>>
> >>>Servers are winbind joined, PAM and krb5 auth, all seems to work fine
> >>>(reading, writing, creating, moving) until trying to delete an
> >>>empty folder
> >>>on the share from Windows client. Folder briefly disappears, but then
> >>>reappears once refreshed. I've confirmed no attributes set,
> >>>files/subfolders or hidden files are in the folder. Age of the folder
> >>>doesn't matter, new empty folders, old empty folders... issue occurs on
> >>>them regardless.
> >>>
> >>>Servers are all various RHEL releases, version 7.9, 8.4 and 8.6. Issue
> >>>occurs regardless if RHEL repo samba packages 4.15.x or Samba
> >>>source builds
> >>>(4.17.5 or 4.18). I did originally open a ticket with Redhat but they
> >>>simply suggested it was a bug since it doesn't occur with samba
> >>>4.13.x and
> >>>passed it onto their engineering team (haven't heard any follow-up in
> >>>months since opening that ticket)
> >>>
> >>>All I can find is a rmdir_internal related error in the logs:
> >>>
> >>>"""""""
> >>>[2023/03/15 10:59:21.285508, 10, pid=8606, effective(1617208032,
> >>>1617207642), real(1617208032, 0)]
> >>>../../source3/smbd/files.c:528(openat_pathref_fullname)
> >>>
> >>> openat_pathref_fullname: fsp [wrk/anly/testfolder/New folder]: OK
> >>>
> >>>[2023/03/15 10:59:21.285573,  3, pid=8606, effective(1617208032,
> >>>1617207642), real(1617208032, 0)]
> >>>../../source3/smbd/close.c:1134(rmdir_internals)
> >>>
> >>> rmdir_internals: couldn't remove directory wrk/anly/testfolder/New
> >>>folder/New folder2 : Invalid argument
> >>>
> >>>[2023/03/15 10:59:21.285596,  5, pid=8606, effective(1617208032,
> >>>1617207642), real(1617208032, 0)]
> >>>../../source3/smbd/files.c:1814(file_free)
> >>>
> >>> file_free: freed files structure 0 (3 used)
> >>>
> >>>[2023/03/15 10:59:21.285611,  5, pid=8606, effective(1617208032,
> >>>1617207642), real(1617208032, 0)]
> >>>../../source3/smbd/close.c:1573(close_directory)
> >>>
> >>> close_directory: wrk/anly/testfolder/New folder/New folder2. Delete on
> >>>close was set - deleting directory returned NT_STATUS_INVALID_PARAMETER.
> >>>""""""
> >>
> >>That would normally mean the flags to unlinkat() were incorrect.
> >>
> >>Is this completely repeatable (i.e. any empty folder cannot
> >>be removed) or is it only sometimes or on some shares ?
> >>
> >
> >Very repeatable, create a directory on a share with a space in the
> >name, login with smbclient to the share and the only way to delete it
> >is to surround the directory name with double quotes, single quotes or
> >the escape character '\' will not work.
>
> Yeah but the original reporter uses a Windows client.
>
> What you're reporting here looks like a smbclient string
> quoting issue.
>
> --
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