xfstest-bld generic/018 fails due to e4defrag issue

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Hi,
running latest xfstest-bld with latest ext4 kernel "dev"
branch(ad6599ab3a).I always get generic/018 failed.
Then I took closer look and found out this issue.

After run this:

fragfile="/vdf/testfile"
for I in `seq 9 -1 0`; do
    dd if=/dev/zero of=$fragfile bs=4k count=1 conv=notrunc seek=$I oflag=sync
done


Even though the file does exist. e4defrag complains about:

(this output comes from kvm guest machine)
> e4defrag -v /vdf/testfile
Can't get super block info: Success
"/vdf/testfile"

Is this a known issue or something I did wrong.

Thank you!

Jon
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