failed to set zram0 incompressible writeback

[glibg10b]

Hi, I created a 1.5G file with fallocate -l 1.5G /var/zram_swap_back. When I run /sbin/zram-init -s2 -alz4 -Lzram_swap -I -b /var/zram_swap_back 1536, this is the output I get:

Sep 20 04:45:44 sodium sh[264951]: /sbin/zram-init: 72: printf: printf: I/O error
Sep 20 04:45:44 sodium sh[264959]: zram-init:
Sep 20 04:45:44 sodium root[264961]: zram-init:
Sep 20 04:45:44 sodium sh[264963]: Warning:
Sep 20 04:45:44 sodium root[264965]: Warning:
Sep 20 04:45:44 sodium sh[264967]: zram-init:
Sep 20 04:45:44 sodium root[264969]: zram-init:
Sep 20 04:45:44 sodium sh[264971]: failed to set zram0 backing_dev
Sep 20 04:45:44 sodium root[264973]: failed to set zram${dev} backing_dev

Does zram-init allow using a file as a backing store?

[inferenceus]

I have the same issue when using a partition as a swap backing-device. The error is as follows:
failed to set zram0 backing_dev

[dsankouski]

Linux supports only partitions as of 6.18

[inferenceus]

Linux supports only partitions as of 6.18

@dsankouski I am using a partition (/dev/nvme0n1p2) but receive the same error.