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

[Chris J Arges]

Public bug reported:

[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

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

** Affects: iproute (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: iproute (Ubuntu Precise)
     Importance: Medium
     Assignee: Chris J Arges (arges)
         Status: In Progress

** Affects: iproute (Ubuntu Quantal)
     Importance: Medium
     Assignee: Chris J Arges (arges)
         Status: In Progress

** Affects: iproute (Ubuntu Raring)
     Importance: Medium
     Assignee: Chris J Arges (arges)
         Status: In Progress

** Also affects: iproute (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: iproute (Ubuntu Quantal)
   Importance: Undecided
       Status: New

** Also affects: iproute (Ubuntu Raring)
   Importance: Undecided
       Status: New

** Changed in: iproute (Ubuntu)
       Status: New => Fix Released

** Changed in: iproute (Ubuntu Precise)
     Assignee: (unassigned) => Chris J Arges (arges)

** Changed in: iproute (Ubuntu Quantal)
     Assignee: (unassigned) => Chris J Arges (arges)

** Changed in: iproute (Ubuntu Raring)
     Assignee: (unassigned) => Chris J Arges (arges)

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

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

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

** Changed in: iproute (Ubuntu Precise)
       Status: New => Triaged

** Changed in: iproute (Ubuntu Quantal)
       Status: New => Triaged

** Changed in: iproute (Ubuntu Raring)
       Status: New => Triaged

** Changed in: iproute (Ubuntu Precise)
       Status: Triaged => In Progress

** Changed in: iproute (Ubuntu Quantal)
       Status: Triaged => In Progress

** Changed in: iproute (Ubuntu Raring)
       Status: Triaged => In Progress

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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:
  In Progress
Status in “iproute” source package in Quantal:
  In Progress
Status in “iproute” source package in Raring:
  In Progress

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

  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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