[Bug 1881847] [NEW] If NFS server reboots, client somethings fails to remount the file system properly

[Robert Dinse]

Public bug reported:

If the NFS server reboots, sometimes client servers fail to re-establish
the NFS mount properly.  This is using NFS v4.2.  The client machine
will hang if I try to do a df when an NFS mount is in this condition.
Attempting to access a file will likewise hang indefinitely.  This is a
problem with the stock 5.3.0.x kernel and it is a problem with 5.6
still.  I have not tried 5.7 yet.  I filed this against nfs-kernel, but
I am not 100% sure it is not nfs-common but there is some sort of
communications not happening between them.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: nfs-kernel-server 1:1.3.4-2.5ubuntu3
Uname: Linux 5.6.0 x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Tue Jun  2 21:34:31 2020
InstallationDate: Installed on 2017-05-27 (1102 days ago)
InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: nfs-utils
UpgradeStatus: Upgraded to focal on 2020-04-26 (38 days ago)

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

  If the NFS server reboots, sometimes client servers fail to re-establish
  the NFS mount properly.  This is using NFS v4.2.  The client machine
  will hang if I try to do a df when an NFS mount is in this condition.
  Attempting to access a file will likewise hang indefinitely.  This is a
  problem with the stock 5.3.0.x kernel and it is a problem with 5.6
- still.  I have not tried 5.7 yet.
+ still.  I have not tried 5.7 yet.  I filed this against nfs-kernel, but
+ I am not 100% sure it is not nfs-common but there is some sort of
+ communications not happening between them.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: nfs-kernel-server 1:1.3.4-2.5ubuntu3
  Uname: Linux 5.6.0 x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Tue Jun  2 21:34:31 2020
  InstallationDate: Installed on 2017-05-27 (1102 days ago)
  InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: nfs-utils
  UpgradeStatus: Upgraded to focal on 2020-04-26 (38 days ago)

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https://bugs.launchpad.net/bugs/1881847

Title:
  If NFS server reboots, client somethings fails to remount the file
  system properly

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  If the NFS server reboots, sometimes client servers fail to re-
  establish the NFS mount properly.  This is using NFS v4.2.  The client
  machine will hang if I try to do a df when an NFS mount is in this
  condition.  Attempting to access a file will likewise hang
  indefinitely.  This is a problem with the stock 5.3.0.x kernel and it
  is a problem with 5.6 still.  I have not tried 5.7 yet.  I filed this
  against nfs-kernel, but I am not 100% sure it is not nfs-common but
  there is some sort of communications not happening between them.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: nfs-kernel-server 1:1.3.4-2.5ubuntu3
  Uname: Linux 5.6.0 x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Tue Jun  2 21:34:31 2020
  InstallationDate: Installed on 2017-05-27 (1102 days ago)
  InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: nfs-utils
  UpgradeStatus: Upgraded to focal on 2020-04-26 (38 days ago)

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