[Bug 1788321] Re: swapon failed: invalid argument

[utnubudnai]

ubuntu 16.04, hit the same issue as this. swapon -v shows these:

```
swapon: /my/swap: found swap signature: version 1d, page-size 4, same byte order
swapon: /my/swap: pagesize=4096, swapsize=13..., devsize=13....
swapon: /my/swap: 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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