[Bug 1788321] Re: swapon failed: invalid argument

[Simon Shapiro]

Good News!

This bug is still here.  Same error on

Dell Inspiron 13-7353, Ubuntu 20.04.1 (Upgraded from 18.05.5),
Kernel:

Linux NOMIS-inspiron 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Filesystem btrfs, Storage: Samsung 650 SSD (1TB).
Was working properly on 18.04, and 20.04.1 on earlier kernels.
I did not try late kernels.

It seems like I have the worst combination of configuration but
innocently walked into this .

I reduced vm.swapiness to ZERO. in the hope I will encouner fewer
crashes.

Please advise.

Thanx.

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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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