[libreoffice-users] LibreOffice exclusive file lock on Samba/CIFS share on Debian Linux: No concurrent read access allowed

Hi, 

We use Debian Linux for our Samba file server and for our client laptops. The clients mount the 
Samba shares by CIFS/SMB.

Everything works fine except for one issue: 

If someone opens a document (e.g. .ods) in LibreOffice, nobody else can open the same document, not 
even read only or as a copy!
LibreOffice asks if you want to open it read only or as a copy, but none of these options works:
For "read only", nothing happens. And for "as a copy" an empty Writer windows appears, even if you 
tried to open a Calc file.
I can't even run "md5sum mydoc.ods", while another user has opened "mydoc.ods" in LibreOffice Calc. 
It says: "Permission denied".
Only if the first user closes Calc / the document, the next user can open it. 
Deleting the "~lock.<filename>" file is possible for all users! But it doesn't help. 
It just makes LibreOffice say "is in use by unknown user" instead of "in use by rbarclay". 
(Sorry if the i18n message strings in source code are not exactly the same in English as described, 
we have the German localization and I freely translated them.)

There seems to be an issue with the file locking of LibreOffice on CIFS shares on Linux.

Has somebody else encountered this issue so far? Is there maybe an issue ticket? 

What file locking related config tweaks are available in LibreOffice? Preventing concurrent WRITE 
access is reasonable. But concurrent READ only access should be allowed!

Here some information from "smbstatus --byterange" on the file server if a user has opened 
"ipsum.ods" in LibreOffice and noone else can open it concurrently:

Locked files:
Pid          Uid        DenyMode   Access      R/W        Oplock           SharePath   Name   Time
--------------------------------------------------------------------------------------------------
28991        11141      DENY_NONE  0x80        RDONLY     NONE             /srv/samba/stuff   .   
Wed Jun 25 10:17:28 2025
28991        11141      DENY_NONE  0x12019f    RDWR       LEASE()          /srv/samba/stuff   
lorem/ipsum.ods   Wed Jun 25 10:17:48 2025

Byte range locks:
Pid        dev:inode       R/W  start     size      SharePath               Name
--------------------------------------------------------------------------------
28991      802:59a1180:0   W    0         -9223372036854775808                          
lorem/ipsum.ods

Thank you for any advice!

Yours,
Reg

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