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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1729993
Title:
proc umounts on nfsroot client when nfs server is heavily loaded
Status in linux package in Ubuntu:
Confirmed
Bug description:
We've got a cluster of diskless compute nodes that we use for highly
CPU-intensive tasks. To keep them minimal, they're headless and
diskless, and they PXE-boot and run NFS-root from a central server.
We recently upgraded the PXE-boot kernel for these nodes to an Ubuntu
16.04 series kernel. Specifically, uname -a on the nodes returns:
Linux fluorine 4.4.0-83-generic #106-Ubuntu SMP Mon Jun 26 17:54:43
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
After the upgrade, we started noticing that anytime the NFS link got
heavily loaded, and the NFS server started getting bogged down trying
to keep up with the requests, the diskless clients would spontaneously
unmount their /proc filesystem. It sounds an awful lot like this
report:
https://forums.gentoo.org/viewtopic-t-1010040-start-0.html
...the fix for which was supposedly integrated into the mainline
kernel as of 3.19.2. But we never saw this issue until just recently,
right after upgrading to 4.4.0. Did the patch that fixed this in 3.19
get somehow reverted in 4.4? Or was a new trigger for this bug
somehow introduced?
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-83-generic (not installed)
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: chaz 2928 F.... pulseaudio
/dev/snd/controlC0: chaz 2928 F.... pulseaudio
CurrentDesktop: XFCE
Date: Fri Nov 3 14:26:29 2017
InstallationDate: Installed on 2014-07-22 (1200 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64
(20140416.2)
MachineType: Micro-Star International Co., Ltd. GT70 2PC
ProcFB:
0 inteldrmfb
1 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-97-generic
root=UUID=9dda5f94-8c6c-45a4-8a4c-38b3f69a8b15 ro rootfstype=btrfs
rootflags=discard,ssd,compress=no,subvol=@ nosplash
RelatedPackageVersions:
linux-restricted-modules-4.4.0-97-generic N/A
linux-backports-modules-4.4.0-97-generic N/A
linux-firmware 1.157.12
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-08-08 (452 days ago)
dmi.bios.date: 04/17/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: E1763IMS.71D
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: MS-1763
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: REV:0.C
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 10
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrE1763IMS.71D:bd04/17/2015:svnMicro-StarInternationalCo.,Ltd.:pnGT702PC:pvrREV0.C:rvnMicro-StarInternationalCo.,Ltd.:rnMS-1763:rvrREV0.C:cvnMicro-StarInternationalCo.,Ltd.:ct10:cvrToBeFilledByO.E.M.:
dmi.product.name: GT70 2PC
dmi.product.version: REV:0.C
dmi.sys.vendor: Micro-Star International Co., Ltd.
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