CIFS: Status code returned 0xc000006d STATUS_LOGON_FAILURE

Linux: 4.18.0-305 OS: CentOS 8.4 I have an SMB folder that is mounted with the following command:

mount -t cifs -o iocharset=utf8,rw,credentials=${_passwordFile},nobrl,nounix,file_mode=0644,dir_mode=0755,rsize=65536,wsize=130048,uid=10002,gid=1005,vers=3.0 //SMB_FOLDER LOCAL_FOLDER

Sometimes it happens that the SMB source is no longer available. Then I get the following error message in

:

Dec  1 12:40:09 XXXX kernel: CIFS: VFS: \\SMB_FOLDER Send error in SessSetup = -13
Dec  1 12:40:09 XXXX kernel: CIFS: Status code returned 0xc000006d STATUS_LOGON_FAILURE
Dec  1 12:40:09 XXXX kernel: CIFS: VFS: \\SMB_FOLDER Send error in SessSetup = -13
Dec  1 12:40:10 XXXX kernel: CIFS: Status code returned 0xc000006d STATUS_LOGON_FAILURE

This error is permanently SPAMMING to the log files. Even if I unmount the folder, the error message is spammed permanently.

umount \\SMB_FOLDER

Although I unmount the folder, I cannot delete it. I get the following error message:

rm: removing 'LOCAL_FOLDER' is not possible: Device or resource busy

The following commands do not provide any output:

+D LOCAL_FOLDER

and

LOCAL_FOLDER

displayed. How can I solve the problem without rebooting?