URL for `eos.url.xrot` attribute wrongfully injects double forward slash in directory name

[vepadulano]

I'm seeing that, sometimes, the URL returned when retrieving the eos.url.xroot attribute from a file on EOS contains a double forward slash. This makes the URL actually invalid, and breaks the EOS redirection for ROOT files. See the following (note the vpadulan// bit).

[vpadulan@lxplus922 /eos/user/v/vpadulan]$touch myfile
[vpadulan@lxplus922 /eos/user/v/vpadulan]$getfattr -n eos.url.xroot myfile
# file: myfile
eos.url.xroot="root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile"

[vepadulano]

Something to note here, there seems to be a dependency on time. When the file is first created, there is a period during which the double forward slash is present in the extended attribute value. Afterwards, the double forward slash disappears. I have created this simple script to reproduce:

# test_xattr.sh
filename=myfile
# Make sure there is no pre-existing file with the same name
rm $filename
touch $filename
# Get xattr immediately after creating the filename
xattr=$(getfattr --only-values -n eos.url.xroot $filename)
cur_xattr=$xattr

seconds_waited=0
while [ "$cur_xattr" = "$xattr" ]
do
    cur_xattr=$(getfattr --only-values -n eos.url.xroot $filename)
    echo "Waited $seconds_waited seconds, xattr=$cur_xattr"
    sleep 5
    seconds_waited=$((seconds_waited+5))
done

This is what I see:

[vpadulan@lxplus922 /eos/user/v/vpadulan]$bash test_xattr.sh 
Waited 0 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 5 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 10 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 15 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 20 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 25 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan//myfile
Waited 30 seconds, xattr=root://eoshome-v.cern.ch//eos/user/v/vpadulan/myfile

Notice that in the last line the double forward slash disappears.