Possible swap corruption

[Julian Kassat]

These log lines of "swap_dup: Bad swap file entry 2000000000000000" preceded a false OOM kill of a process, which is being investigated in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655842.

Also attached kern.log containing the full output.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-64-generic 4.4.0-64.85
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Feb 24 09:21 seq
 crw-rw---- 1 root audio 116, 33 Feb 24 09:21 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Fri Mar 3 09:11:56 2017
HibernationDevice: RESUME=/dev/mapper/riemann1--vg-swap_1
InstallationDate: Installed on 2016-11-21 (101 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
JournalErrors:
 -- Logs begin at Wed 2017-03-01 21:57:47 CET, end at Fri 2017-03-03 08:57:33 CET. --
 Mar 02 09:40:59 hostname systemd-tmpfiles[31014]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
 Mar 03 08:56:34 hostname su[16784]: pam_authenticate: Authentication failure
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: innotek GmbH VirtualBox
PciMultimedia:

ProcEnviron:
 LC_CTYPE=de_DE.UTF-8
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 vboxdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-64-generic root=/dev/mapper/hostname--vg-root ro biosdevname=0 net.ifnames=0 quiet
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-64-generic N/A
 linux-backports-modules-4.4.0-64-generic N/A
 linux-firmware 1.157.8
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.10 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10.1

[Julian Kassat (j.kassat)]

This issue occurs when an OOM kill is triggered (see [0]). This was observed for the first time on kernel version 4.4.0-59-generic #80-Ubuntu.

On the affected machine, I will give the mainline kernel a try add the tags accordingly.

Thanks so far.

[0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655842