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),
** Patch added: "iproute2-4.3.0+no-remount-sysfs.patch"
https://bugs.launchpad.net/ubuntu/+source/iproute2/+bug/1870554/+attachment/5345648/+files/iproute2-4.3.0+no-remount-sysfs.patch
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