Kernel Bug When High Memory Usage

[zhanghongce]

Dmesg shows that there is a kernel bug

[825979.477960] /build/linux-SwhOyu/linux-4.4.0/mm/pgtable-generic.c:33: bad pmd ffff8809452bcc00(0000000dc62009e2)
[826927.570746] huge_memory: mapcount 0 page_mapcount 1
[826927.570920] ------------[ cut here ]------------
[826927.571060] kernel BUG at /build/linux-SwhOyu/linux-4.4.0/mm/huge_memory.c:1941!
[826927.571300] invalid opcode: 0000 [#1] SMP

At the same time, we observed high memory usage. (I'm not sure which is the cause, in other words, high memory usage causes this bug or this bug causes high memory usage)

$uname -a
Linux sat-10 4.4.0-104-generic #127-Ubuntu SMP Mon Dec 11 12:16:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-104-generic 4.4.0-104.127
ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
Uname: Linux 4.4.0-104-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Jan 8 15:21 seq
 crw-rw---- 1 root audio 116, 33 Jan 8 15:21 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.15
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: Thu Jan 18 10:39:00 2018
HibernationDevice: RESUME=/dev/mapper/satx--vg-swap_1
InstallationDate: Installed on 2017-12-19 (30 days ago)
InstallationMedia: Ubuntu-Server 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
 Bus 002 Device 002: ID 8087:8002 Intel Corp.
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub
 Bus 001 Device 002: ID 8087:800a Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge T630
PciMultimedia:

ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-104-generic.efi.signed root=/dev/mapper/satx--vg-root ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-104-generic N/A
 linux-backports-modules-4.4.0-104-generic N/A
 linux-firmware 1.157.14
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/17/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.5.4
dmi.board.name: 0NT78X
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 17
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.5.4:bd08/17/2017:svnDellInc.:pnPowerEdgeT630:pvr:rvnDellInc.:rn0NT78X:rvrA06:cvnDellInc.:ct17:cvr:
dmi.product.name: PowerEdge T630
dmi.sys.vendor: Dell Inc.

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

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 v4.15 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/v4.15-rc8

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]