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Bug#656754: linux-image-2.6.39-bpo.2-amd64: vlan malfunction

Package: linux-2.6
Version: 2.6.39-3~bpo60+1
Severity: important
Tags: d-i ipv6 upstream

The network functionality is only guaranteed on the underlying network interface with vlanid 0. dmesg does not report any problems concerning vlan. The 8021q module is loaded. It can be loaded and unloaded without problems. Network interfaces and bridge interfaces which have been set up to use vlan can not be used.
/proc/net/vlan/config reports interface-vlan-relations as usual. Manually setting up an interface using vconfig does not change the situation.
Monitoring an interface with iptraf shows traffic in eth0 (unidirectional), while traffic on vlan interface will always show non-ip traffic only.
Changing the raw interface does not show up a difference in this behaviour.
Installing ifupdown-scripts-zg2 and ifupdown-scripts-extras does not change anything.
Tested with amd64 on Asus M2A-VM board with RTL8111/8168B network chip a 3c905C-TX/TX-M [Tornado] network card.
The error is reproducible.
The same configuration works well on the 2.6.32 "stock" kernel.

-- Package-specific info:
** Kernel log: boot messages should be attached

currently unable to attach.

-- System Information:
Debian Release: 6.0.3
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'stable-updates'), (500, 'proposed-updates')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-vserver-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash

Versions of packages linux-image-2.6.39-bpo.2-amd64 depends on:
ii  cdebconf [debconf-2.0]    0.153+squeeze2 Debian Configuration Management Sy
ii  debconf [debconf-2.0]       Debian configuration management sy
ii  initramfs-tools [linux-in 0.99~bpo60+1   tools for generating an initramfs
ii  linux-base                3.3~bpo60+1    Linux image base package
ii  module-init-tools         3.12-1         tools for managing Linux kernel mo

Versions of packages linux-image-2.6.39-bpo.2-amd64 recommends:
ii  firmware-linux-free    2.6.32-39squeeze1 Binary firmware for various driver

Versions of packages linux-image-2.6.39-bpo.2-amd64 suggests:
ii  grub-pc        1.98+20100804-14+squeeze1 GRand Unified Bootloader, version 
pn  linux-doc-2.6. <none>                    (no description available)

Versions of packages linux-image-2.6.39-bpo.2-amd64 is related to:
ii  firmware-bnx2               0.32~bpo60+1 Binary firmware for Broadcom NetXt
ii  firmware-bnx2x              0.32~bpo60+1 Binary firmware for Broadcom NetXt
ii  firmware-ipw2x00            0.32~bpo60+1 Binary firmware for Intel Pro Wire
ii  firmware-ivtv               0.32~bpo60+1 Binary firmware for iTVC15-family 
ii  firmware-iwlwifi            0.32~bpo60+1 Binary firmware for Intel Wireless
ii  firmware-linux              0.32~bpo60+1 Binary firmware for various driver
ii  firmware-linux-nonfree      0.32~bpo60+1 Binary firmware for various driver
ii  firmware-qlogic             0.32~bpo60+1 Binary firmware for QLogic IBA7220
ii  firmware-ralink             0.32~bpo60+1 Binary firmware for Ralink wireles
pn  xen-hypervisor              <none>       (no description available)

-- debconf information:
  linux-image-2.6.39-bpo.2-amd64/prerm/removing-running-kernel-2.6.39-bpo.2-amd64: true
* linux-image-2.6.39-bpo.2-amd64/postinst/missing-firmware-2.6.39-bpo.2-amd64:
  linux-image-2.6.39-bpo.2-amd64/postinst/depmod-error-initrd-2.6.39-bpo.2-amd64: false

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