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    Subject[PATCH] vlan:return error when real dev is enslaved
    Qinhuibin reported a kernel panic when he do some operation about vlan.

    The operation is as below:
    ifconfig eth2 up
    modprobe bonding
    modprobe 8021q
    ifconfig bond0 up
    ifenslave bond0 eth2
    vconfig add eth2 3300
    vconfig add bond0 33
    vconfig rem eth2.3300

    the panic stack is as below:
    [<ffffffffa002f1c9>] panic_event+0x49/0x70 [ipmi_msghandler]
    [<ffffffff80378917>] notifier_call_chain+0x37/0x70
    [<ffffffff80372122>] panic+0xa2/0x195
    [<ffffffff80376ed8>] oops_end+0xd8/0x140
    [<ffffffff8001bea7>] no_context+0xf7/0x280
    [<ffffffff8001c1a5>] __bad_area_nosemaphore+0x175/0x250
    [<ffffffff80376318>] page_fault+0x28/0x30
    [<ffffffffa039dabd>] igb_vlan_rx_kill_vid+0x4d/0x100 [igb]
    [<ffffffffa044045f>] bond_vlan_rx_kill_vid+0x9f/0x290 [bonding]
    [<ffffffffa047e636>] unregister_vlan_dev+0x136/0x180 [8021q]
    [<ffffffffa047ed20>] vlan_ioctl_handler+0x170/0x3f0 [8021q]
    [<ffffffff802c1d3f>] sock_ioctl+0x21f/0x280
    [<ffffffff800e6d7f>] vfs_ioctl+0x2f/0xb0
    [<ffffffff800e726b>] do_vfs_ioctl+0x3cb/0x5a0
    [<ffffffff800e74e1>] sys_ioctl+0xa1/0xb0
    [<ffffffff80007388>] system_call_fastpath+0x16/0x1b
    [<00007f108a2b8bd7>] 0x7f108a2b8bd7
    And the nic is as below:
    [root@localhost ~]# ethtool -i eth2
    driver: igb
    version: 3.0.6-k2
    firmware-version: 1.2-1
    bus-info: 0000:04:00.0
    kernel version: also happen in 2.6.32-131

    For kernel 2.6.32, the reason of this bug is that when we do "vconfig add bond0 33",
    adapter->vlgrp is overwritten in igb_vlan_rx_register. So when we do "vconfig rem
    eth2.3300", it can't find the correct vlgrp.

    And this bug is avoided by vlan cleanup patchset from Jiri Pirko
    <>, especially commit b2cb09b1a772(igb: do vlan cleanup).

    But it is not a correct operation to creat a vlan interface on eth2
    when it have been enslaved by bond0, so this patch is to return error
    when the real dev is already enslaved.

    Signed-off-by: Weiping Pan <>
    net/8021q/vlan.c | 5 +++++
    1 files changed, 5 insertions(+), 0 deletions(-)

    diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
    index 5471628..8ba9226 100644
    --- a/net/8021q/vlan.c
    +++ b/net/8021q/vlan.c
    @@ -148,6 +148,11 @@ int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
    const char *name = real_dev->name;
    const struct net_device_ops *ops = real_dev->netdev_ops;

    + if (real_dev->flags & IFF_SLAVE) {
    + pr_info("Error, %s was already enslaved\n", name);
    + return -EOPNOTSUPP;
    + }
    if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
    pr_info("VLANs not supported on %s\n", name);
    return -EOPNOTSUPP;
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      Last update: 2011-11-15 09:39    [W:0.021 / U:30.424 seconds]
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