Fixed my problem. While looking through /var/log/syslog, I noticed this line around the same time swap mount failed.
BTRFS warning (device sda3): swapfile must not be copy-on-write Then a few lines later... systemd[1]: swap.img.swap: Failed with result 'exit-code'. systemd[1]: Failed to activate swap /swap.img. systemd[1]: Dependency failed for Swap. systemd[1]: swap.target: Job swap.target/start failed with result 'dependency'. Yes my root is on btrfs and I did not see this error before. So I deleted /swap.img and started over. $ sudo rm -rf /swap.img $ sudo touch /swap.img $ sudo chattr +C /swap.img $ sudo fallocate -l 2G /swap.img $ sudo chmod 600 /swap.img $ sudo mkswap /swap.img $ sudo swapon /swap.img No error and "swapon --show" gives this: NAME TYPE SIZE USED PRIO /swap.img file 2G 0B -2 Just what I was expecting. So problem solved for me, maybe a check can be put in to see if it's on btrfs and apply the 'chattr +C' option. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788321/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
