Public bug reported:
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
** Patch added: "iproute2-4.3.0+no-remount-sysfs.patch"
https://bugs.launchpad.net/bugs/1870554/+attachment/5345647/+files/iproute2-4.3.0+no-remount-sysfs.patch
** Patch removed: "iproute2-4.3.0+no-remount-sysfs.patch"
https://bugs.launchpad.net/ubuntu/+source/iproute2/+bug/1870554/+attachment/5345647/+files/iproute2-4.3.0+no-remount-sysfs.patch
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https://bugs.launchpad.net/bugs/1870554
Title:
ip-netns(8) unmounts /sys filesystem hierarchy within namespace
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