[Samba] Weird folders / files after upgrading to Samba 4.20

[Matthias Kühne | Ellerhold Aktiengesellschaft]

Hello,

my smb.conf is in the first post. Im not setting unix extensions 
explictly, so the default is used (which is yes)? But they are only 
active for smb1 right? I did not activate the smb3 unix extensions.

This also happens for shares that are not mounted by cifs ... e. g. we 
have a share that is used as a hotfolder for a RIP. The workflow is, 
that people mount them in MacOS and put files there. A windows machine 
has these shares mounted and regularly looks for new files ("hotfolder") 
and process them and puts them back. In this workflow no cifs is ever 
used - just MacOS 14 + Win 10. This was the most egregious share we 
had... 170 new weird directories in 24 hours!! Ive deleted them and 
rolled back to 4.19 ... no problems since.

This 2nd share is hard to debug, because the clients are known to create 
problems, thats why I mentioned the first share (where only cifs+samba 
is used) as the main debug target.

So Im guessing the problem is in Samba and not cifs, win10 AND MacOs.

Regards, Matthias.

Am 18.07.24 um 23:23 schrieb Michael Tokarev via samba:
> 18.07.2024 13:03, Matthias Kühne | Ellerhold Aktiengesellschaft via 
> samba wrote:
>> Hallo,
>>
>> yes this is an "ls -lAh" on the samba fileserver side in the
>> corresponding directory.
>>
>> Downgrading to 4.19 does not remove the weird directories and files. But
>> it prevents new weird ones being created...
>>
>> Looking at the timestamps these seem to be created when (heavy?)
>> filesystem operations are being done. There is a cronjob that imports
>> images at 1oo and it runs for around 30 mins. Most of the weird
>> directory are created between 1:00 and 1:30. This cronjob runs on
>> another server which has this share mounted via fstab.
>
> Aha.  This is much more understandable.
>
> Do you have unix extensions enabled on the samba server?
> 4.20 has some work in this area.  It might be interesting to
> test 4.20 without unix extensions - if you can afford the
> same havoc as you already had (which isn't easy for sure).
>
> Provided this problem is reproducible, ofc.
>
> Maybe you can run your job on another - test - share with 4.20
> and switch back to 4.19 before real night job is run.
>
> This is just a wild guess, anyway.
>
>> Nobody else has these problems with Samba 4.20 and debian 12? Any help
>> is greatly appreciated.
>
> cifs mount isn't seen/used often already.  From your description it
> looks like linux cifs client with samba 4.20 is the bad combination,
> and it might require some high filesystem load.
>
> Thanks,
>
> /mjt
>
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