[Bug 1238981] Re: iproute - Cannot remove /var/run/netns/namespace: Device or resource busy

[Chris J Arges]

This patch as it stands introduces a regression:

[ Test Case ]

ip netns add netns_old
ip link add name if_old type veth peer name if_old_peer
ip link set dev if_old_peer netns netns_old
ip netns exec netns_old bash

< upgrade package >

ip netns add netns_one
ip link add name if_one type veth peer name if_one_peer
ip link set dev if_one_peer netns netns_one
ip netns exec netns_one bash

ip netns exec netns_old bash

--
Here we get "seting the network namespace failed: Invalid argument"

If we don't upgrade the package it works, so its modifying something.

I also tested this with a no-change package from 1ubuntu2 and the above
works.


** Tags removed: verification-done
** Tags added: verification-failed

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https://bugs.launchpad.net/bugs/1238981

Title:
  iproute - Cannot remove /var/run/netns/namespace: Device or resource
  busy

Status in “iproute” package in Ubuntu:
  Fix Released
Status in “iproute” source package in Precise:
  Fix Committed
Status in “iproute” source package in Quantal:
  Fix Committed
Status in “iproute” source package in Raring:
  Fix Committed

Bug description:
  [Impact]
  Trying to remove a namespace when another namespace is mounted may fail.
  Upstream discussion here: http://comments.gmane.org/gmane.linux.network/240795
  This affects P/Q/R, but is fixed in S.

  [Test Case]
  Run this as root in one terminal:

  ip netns add netns_one
  ip netns add netns_two
  ip link add name if_one type veth peer name if_one_peer
  ip link add name if_two type veth peer name if_two_peer
  ip link set dev if_one_peer netns netns_one
  ip link set dev if_two_peer netns netns_two
  ip netns exec netns_one bash

  Run this as root in another terminal:
  ip netns delete netns_two

  It should pass, but this fails with:
  Cannot remove /var/run/netns/netns_two: Device or resource busy

  [Fix]
  This patch fixes the issue:
  https://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=58a3e8270fe72f8ed92687d3a3132c2a708582dd

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