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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sebastien Bacher (seb128):

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

** Affects: iproute2 (Ubuntu)
     Importance: Undecided
         Status: New

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ip-netns(8) unmounts /sys filesystem hierarchy within namespace
https://bugs.launchpad.net/bugs/1870554
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