Re: Cannot mount DFS shares after upgrade to 10.9

[Yvan Masson <yvan@masson-informatique.fr>]

In case no answer comes from debian-user@lists.debian.org, maybe you 
should ask samba@lists.samba.org.

Regards,
Yvan

Le 03/04/2021 à 20:32, Joel Davies a écrit :
> We have some autofs mounts that stopped working after the 10.9 updates 
> were applied. Seems that the kernel update is the cause – I applied just 
> the kernel update and same thing happens. The mounts that stopped 
> working were targeting Windows domain DFS shares. The DFS root can still 
> be mounted (//domain.local/DFS) which we may have to end up using but 
> then will have to reconfigure stuff. Subfolders of normal shares also 
> can still be mounted (//Server.domain.local/Share/Subfolder). It is just 
> the DFS shares that don’t work currently (//domain.local/DFS/Share).
>
> Here is what happens mounting the shares manually:
>
> Under kernel 4.19.0-14-amd64 (previous to 10.9 updates):
>
> $sudo mount -t cifs -o username=user,vers=3.0 //domain.local/DFS/Share 
> /mnt --verbose
>
> Password for user@//domain.local/DFS/Share:  *********
>
> mount.cifs kernel mount options: 
> ip=10.x.x.x,unc=\\domain.local\DFS,vers=3.0,user=user,prefixpath=Share,pass=********
>
> Normally no messages in syslog and share is successfully mounted.
>
> After updating kernel to 4.19.0-16-amd64:
>
> $sudo mount -t cifs -o username=user, //domain.local/DFS/Share /mnt 
> --verbose
>
> Password for user@//domain.local/DFS/Share:  *********
>
> mount.cifs kernel mount options: 
> ip=10.x.x.x,unc=\\domain.local\DFS,vers=3.0,user=user,prefixpath=Share,pass=********
>
> mount error(2): No such file or directory
>
> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
>
> Syslog shows:
>
> CIFS VFS: cifs_read_super: get root inode failed
>
> I didn’t find much of use online to troubleshoot that message. I did try 
> different values of vers option as well as each of serverino and 
> noserverino and several combinations of both – no difference. Any 
> suggestions?
>
> (Occasionally syslog also shows “CIFS VFS: error -2 on ioctl to get 
> interface list”. This happened about one in five mount attempts both 
> before and after the kernel update, regardless of whether or not the 
> share mounted. Since it did appear before the update when mounting 
> always worked, I am assuming it is not relevant.)
>
> Thanks,
>
> Joel Davies

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