Something seems broken on my machine:
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: mkswap: only one device argument is currently supported
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: Usage:
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: mkswap [options] device [size]
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: Options:
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -c, --check check bad blocks before creating the swap area
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -f, --force allow swap size area be larger than device
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -p, --pagesize SIZE specify page size in bytes
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -L, --label LABEL specify label
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -v, --swapversion NUM specify swap-space version number
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -U, --uuid UUID specify the uuid to use
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -V, --version output version information and exit
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: -h, --help display this help and exit
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed zramctl:: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed /dev/zram0:: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed failed: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed to: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed reset:: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed Device: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed or: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed resource: No such file or directory
Dec 14 14:54:16 test.local.neth.eu zramstart[4437]: swapon: stat failed busy: No such file or directory
I will spend some time on it and let you know.