File this bug because xfstests generic/453 fail. Test to create the special filename. It's failed if the filename includes backslash.

[root@hpe-dl380pgen8-02-vm-15 ~]# cat /etc/samba/smb.conf
[global]
ea support = yes
strict allocate = yes
[test]
path=/mnt/test
writeable=yes
[scratch]
path=/mnt/scratch
writeable=yes
[root@hpe-dl380pgen8-02-vm-15 ~]# mount //localhost/test cifs -o
user=root,password=redhat
[root@hpe-dl380pgen8-02-vm-15 ~]# cd cifs
[root@hpe-dl380pgen8-02-vm-15 cifs]#  touch "urk\xc0\xafmoo"
touch: setting times of 'urk\xc0\xafmoo': Invalid argument

As I know, the filename included backslash can't be created in windows. But I'm not sure if it's the same for samba server.

[root@hpe-dl380pgen8-02-vm-15 cifs]# ./test-453.sh
+ str='urk\xc0\xafmoo'
++ echo -e 'urk\xc0\xafmoo'
+ str1=$'urk\300\257moo'
+ echo $'urk\300\257moo'
urk��moo
+ echo hello
./test-453.sh: line 5: urk��moo: No such file or directory
[root@hpe-dl380pgen8-02-vm-15 cifs]# cat test-453.sh
#!/bin/bash -x
str="urk\xc0\xafmoo"
str1="$(echo -e $str)"
echo "$str1"
echo "hello" > "$str1"

Here the error is "No such file or directory" not "Invalid argument". Not sure if they are the same issue. By the way, all the tests above are passed for nfs and xfs.