restarting container with a vlan interface results in kernel stack trace

I have the same problem.

Network config:
--------------
lxc.network.type=vlan
lxc.network.link=eth0
lxc.network.name=eth1
lxc.network.vlan.id = 3575
lxc.network.flags=up
--------------

From stack trace:
----------------
[63371.593308] WARNING: CPU: 6 PID: 10623 at /build/buildd/linux-lts-trusty-3.13.0/fs/sysfs/dir.c:486 sysfs_warn_dup+0x91/0xb0()
[63371.593310] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:06.0/0000:03:00.0/0000:04:00.0/net/eth0/upper_vlan3575'
---------------

It seems to be a problem with the kernel. This is the kernel version on this host:
# uname -r
3.13.0-32-generic

I have another host with the same lxc version. But with a different kernel that doesn't have this problem:
# uname -r
3.5.0-39-generic

Installation of kernel 3.16 (of course with boot option intel_pstate=disable) fixed the problem.

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1410852

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

I can easily reproduce this issue.
Tested with 3.16 mainline kernel and this did not occur. I can begin a bisect tomorrow, or test any proposals.

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

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

This bug was fixed in the package linux - 3.13.0-49.81

---------------
linux (3.13.0-49.81) trusty; urgency=low

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  * [Config] updateconfigs - enable X86_UP_APIC_MSI

  [ Upstream Kernel Changes ]

  * net: add sysfs helpers for netdev_adjacent logic
    - LP: #1410852
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    - LP: #1410852
  * net: rename sysfs symlinks on device name change
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    - LP: #1417915
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    - CVE-2015-1465
  * x86, mm/ASLR: Fix stack randomization on 64-bit systems
    - LP: #1423757
    - CVE-2015-1593
  * net: llc: use correct size for sysctl timeout entries
    - LP: #1425271
    - CVE-2015-2041
  * net: rds: use correct size for max unacked packets and bytes
    - LP: #1425274
    - CVE-2015-2042
  * Btrfs: clear compress-force when remounting with compress option
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    - LP: #1435441
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  * Bluetooth: sort the list of IDs in the source code
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  * Bluetooth: Add support for Intel bootloader devices
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  * Bluetooth: Add support for Acer [13D3:3432]
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  * Add a new PID/VID 0227/0930 for AR3012.
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  * spi: dw: Fix detecting FIFO depth
  * spi: dw-mid: fix FIFO size
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  * ASoC: omap-mcbsp: Correct CBM_CFS dai format configuration
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  * nfs: fix dio deadlock when O_DIRECT flag is flipped
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