systemd is reporting:

systemd[1]: swapfile.swap: Failed with result 'exit-code'.

so you are using a non-raw device swapfile called swapfile.swap that is
not a contiguous swap file (that is, has no file holes), hence it can't
be used as swap.  Linux will create files with holes to save space (this
is a sparse file) but swap files must not have holes.

The location of the swap file can be found using:

grep swap /etc/fstab

A good way to generate a swapfile without holes is to use dd, e.g.

sudo dd if=/dev/zero of=/path/swapfile.swap bs=1024 count=1048576
sudo chmod 0600 /path/swap.swp
sudo chown root:root /path/swap.swp

..where path is the path to the swapfile.

This is not a kernel bug, but a mis-configuration of the swap file.

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https://bugs.launchpad.net/bugs/1742934

Title:
  Double swapon message

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