RHEL 7.5 CIFS VFS: Push locks rc = -12

Hello,

Can anyone kindly advise me why am i seeing this message on my RHEL server whenever my backup is running? "CIFS VFS: Push locks rc = -12"

it usually will spam a list of "CIFS VFS: Push locks rc = -12"

Some insights, i'm backing up a few folders from my linux machine using SMB on my windows server.

Really appreciate if anyone can advise me on this.