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[Bug 1410852] Re: restarting container with a vlan interface results in kernel stack trace

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>
Date: Wed, 01 Apr 2015 15:48:29 -0000
Reply-to: Bug 1410852 <1410852@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Bug is easily reproducible with 3.13.0-48, cannot reproduce in
3.13.0-49. Marking as verified for trusty.

** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty

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https://bugs.launchpad.net/bugs/1410852

Title:
  restarting container with a vlan interface results in kernel stack
  trace

Status in lxc containers:
  Invalid
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  [Impact]
  Users of VLANs with LXC containers will see kernel BUGs when starting and stopping containers.

  [Test Case]
  - In trusty, install lxc and vlan.
  - Edit /etc/lxc/default.conf as follows:
      lxc.network.type=vlan 
      lxc.network.vlan.id=10
      lxc.network.flags=up
      lxc.network.link=eth0
      lxc.aa_profile = unconfined
  - Setup LXC container
      sudo lxc-create -t download -n u1 -- --dist ubuntu --release trusty --arch amd64
  - Run the following until you see the failure:
      lxc-start --name u1 -d
      lxc-stop --name u1

  [Fix]
  commit 5bb025fae53889cc99a21058c5dd369bf8cce820
  support patches:
  commit 0a59f3a9fd7e2801a445682465ea0522ea497183
  commit 3ee32707560955e92d30f7f6e5138cb92a3b1a7e

  --

  Stopping a container and starting it again results in kernel stack
  trace with a vlan interface.

  ---8<---
  lxc.network.type = vlan
  lxc.network.flags = up
  lxc.network.link = p3p1
  lxc.network.vlan.id = 2
  ---8<---

  dpkg -l | grep lxc
  ii  liblxc1                             1.0.6-0ubuntu0.1                    amd64        Linux Containers userspace tools (library)
  ii  lxc                                 1.0.6-0ubuntu0.1                    amd64        Linux Containers userspace tools
  ii  lxc-templates                       1.0.6-0ubuntu0.1                    amd64        Linux Containers userspace tools (templates)
  ii  python3-lxc                         1.0.6-0ubuntu0.1                    amd64        Linux Containers userspace tools (Python 3.x bindings)

  cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic root=UUID=6d1fc9aa-735c-4e61-ae1c-0a9d2587e77b ro acpi_osi=Linux acpi=force acpi_enforce_resources=lax i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1

  Snipplet from stack trace:
  ---8<---
  [35188.374621] WARNING: CPU: 4 PID: 3933 at /build/buildd/linux-3.13.0/fs/sysfs/dir.c:486 sysfs_warn_dup+0x86/0xa0()
  [35188.374623] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:1c.3/0000:02:00.0/net/p3p1/upper_vlan2'
  ---8<---

  Is deconfiguration on stop of an lxc instance not working anymore?

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