[Bug 1788321] Re: swapon failed: invalid argument

[clickwir]

Just did a fresh install of 20.04 as a Proxmox VM and see this "invalid
argument" in the start up messages and syslog. Trying to start it
manually also fails. Tried recreating it, also failed.

root at changeme:/# fallocate -l 2G /swap.img 
root at changeme:/# chmod 600 /swap.img 
root at changeme:/# ls -lah /swap.img 
-rw------- 1 root root 2.0G Apr 24 04:07 /swap.img
root at changeme:/# mkswap /swap.img 
mkswap: /swap.img: warning: wiping old swap signature.
Setting up swapspace version 1, size = 2 GiB (2147479552 bytes)
no label, UUID=bd9bdc4f-4c53-4b0b-ad92-687ed5f669e6
root at changeme:/# swapon /swap.img
swapon: /swap.img: swapon failed: Invalid argument
root at changeme:/# swapon -v /swap.img
swapon: /swap.img: found signature [pagesize=4096, signature=swap]
swapon: /swap.img: pagesize=4096, swapsize=2147483648, devsize=2147483648
swapon /swap.img
swapon: /swap.img: swapon failed: Invalid argument

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https://bugs.launchpad.net/bugs/1788321

Title:
  swapon failed: invalid argument

Status in linux package in Ubuntu:
  Confirmed
Status in util-linux package in Ubuntu:
  Invalid

Bug description:
  Environment:
   - Ubuntu 18.04.1 LTS
   - Linux 4.15.0-32-generic i686

  Description:
  When I try to mount my swap partition or my swap file, I get "swapon failed: invalid argument" .

  Steps to reproduce:
  1) sudo bash
  2) dd if=/dev/zero of=/swapfile bs=1024 count=524288
  3) mkswap /swapfile
  4) chown root:root /swapfile
  5) chmod 0600 /swapfile
  6) swapon /swapfile
  Last execution returns "swapon failed: invalid argument" .

  I'm almost sure it's a bug because I have no problems using Linux
  4.15.0-29-generic instead of Linux 4.15.0-32-generic. Also, no
  problems using Ubuntu 18.04.1 LTS Live CD.

  Regards.

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