Double swapon message

[Cristian Aravena Romero]

Hello,

dmesg:
[ 4.086945] swapon: swapfile has holes
[ 5.507148] swapon: swapfile has holes

Regards,
--
Cristian

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.13.0-25-generic 4.13.0-25.29
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: caravena 1664 F...m pulseaudio
 /dev/snd/controlC0: caravena 1664 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 12 09:50:39 2018
InstallationDate: Installed on 2017-10-13 (90 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.13.0-25-generic root=UUID=707d0f89-4b1d-4432-9d50-6058dc4c1ee9 ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-25-generic N/A
 linux-backports-modules-4.13.0-25-generic N/A
 linux-firmware 1.170
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.family: ChiefRiver System
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Colin Ian King (colin-king)]

systemd is reporting:

systemd[1]: swapfile.swap: Failed with result 'exit-code'.

so you are using a non-raw device swapfile called swapfile.swap that is not a contiguous swap file (that is, has no file holes), hence it can't be used as swap. Linux will create files with holes to save space (this is a sparse file) but swap files must not have holes.

The location of the swap file can be found using:

grep swap /etc/fstab

A good way to generate a swapfile without holes is to use dd, e.g.

sudo dd if=/dev/zero of=/path/swapfile.swap bs=1024 count=1048576
sudo chmod 0600 /path/swap.swp
sudo chown root:root /path/swap.swp

..where path is the path to the swapfile.

This is not a kernel bug, but a mis-configuration of the swap file.