[Bug 1870554] Re: ip-netns(8) unmounts /sys filesystem hierarchy within namespace

[Mathew Hodson]

** Changed in: iproute2 (Ubuntu)
   Importance: Undecided => Medium

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Title:
  ip-netns(8) unmounts /sys filesystem hierarchy within namespace

Status in iproute2 package in Ubuntu:
  New

Bug description:
  Filesystems ordinarily mounted beneath /sys, particularly /sys/fs/cgroup, are not mounted within network namespaces created by ip-netns(8), as lib/namespace.c:netns_switch() explicitly remounts /sys.
  The patch enclosed removes the offending calls to umount2(2) and mount(2), leaving the /sys hierarchy intact within network namespaces.

  $ lsb_release -rd
  Description:    Ubuntu 18.04.4 LTS
  Release:        18.04

  $ apt-cache policy iproute2
  iproute2:
    Installed: 4.15.0-2ubuntu1
    Candidate: 4.15.0-2ubuntu1
    Version table:
   *** 4.15.0-2ubuntu1 500
          500 http://fr2.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  Nota bene: this bug was reported in [1] (unresolved) and, on Arch
  Linux, [2].

  References:
  [1] https://answers.launchpad.net/ubuntu/+source/iproute2/+question/659146
  [2] https://bugs.archlinux.org/task/33328

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