DFS mounting wrong path

[David Disseldorp]

Hi Luiz,

On Thu, 13 Apr 2023 16:41:20 -0300, Luiz Angelo Daros de Luca via samba-technical wrote:

> Hello,
> 
> I have a strange situation with the kernel following DFS directories
> to the wrong location.
> In a share with a couple of DFS entries, sometimes the kernel follows
> the wrong path. Something like this:
> 
> server: /share/dir/subdir1 -> msdfs:server\share1$
> server: /share/dir/subdir2 -> msdfs:server\share2$
> ...
> server: /share/dir/subdir11 -> msdfs:server\share11$
> server: /share/dir/subdir12 -> msdfs:server\share12$
> 
> And in the client, we have:
> 
> client: //server/dir/subdir1 on /mnt/share/dir/subdir1
> client: //server/dir/subdir2 on /mnt/share/dir/subdir2
> ...
> client: //server/dir/subdir11 on /mnt/share/dir/subdir11
> client: //server/dir/subdir12 on /mnt/share/dir/subdir11 <<< (should
> be subdir12!)
> 
> It always happens with older kernels (5.14 from opensuse/sles 15.4),
> where the first DFS is always used everywhere. However it still
> randomly happens with newer kernels like 6.2.9-1-default from opensuse
> tumbleweed. I can always reproduce it if I do a "ls subdir*" but it
> does not happen if I first "ls subdir12" and then "ls subdir*". It
> looks like a race condition, but it might be an off-by-one case as I
> only observed that with the last DFS in the directory (12th in my real
> case).
> 
> Has anyone seen this behavior?

Yes, I've seen something like this, but didn't get a chance to look
closer. Please raise a ticket on openSUSE / samba / kernel bugzilla
tracker of your choice and add the reproducer details :)

Cheers, David