Kernel 2.6.28.7 + KVM

[wire <wiro.wire@gmail.com>]

Hello,

I use debian system on our academic network and we are using KVM for
virtual machines.
Yesterday I setup new virtual machine and I saw some interesting
messages from kernel.

[300407.316614] WARNING: at net/core/dst.c:266 dst_release+0x23/0x2c()
[300407.316615] Modules linked in: 8021q kvm_intel kvm bridge stp llc
xfs coretemp w83627hf w83793 hwmon_vid shpchp rng_core pci_hotplug
i2c_i801 psmouse iTCO_wdt container button ext3 jbd mbcache ehci_hcd
uhci_hcd sg sd_mod sr_mod thermal processor fan
[300407.316626] Pid: 0, comm: swapper Tainted: G        W  2.6.28.7 #1
[300407.316628] Call Trace:
[300407.316628]  <IRQ>  [<ffffffff80235189>] warn_on_slowpath+0x51/0x75
[300407.316632]  [<ffffffff805cc0c7>] tcp_v4_do_rcv+0x1db/0x37c
[300407.316634]  [<ffffffff805b962b>] inet_twsk_schedule+0x2b/0x191
[300407.316636]  [<ffffffff805cc73a>] tcp_v4_rcv+0x4d2/0x771
[300407.316638]  [<ffffffff805983dd>] dst_release+0x23/0x2c
[300407.316643]  [<ffffffffa016658e>] br_nf_local_in+0x2c/0x3b [bridge]
[300407.316644]  [<ffffffff805ac652>] nf_iterate+0x41/0x7d
[300407.316646]  [<ffffffff80594500>] netif_receive_skb+0x0/0x399
[300407.316648]  [<ffffffff805ac6f0>] nf_hook_slow+0x62/0xc3
[300407.316650]  [<ffffffff80594500>] netif_receive_skb+0x0/0x399
[300407.316654]  [<ffffffffa016291c>] br_handle_frame_finish+0x104/0x148
[bridge]
[300407.316659]  [<ffffffffa0166a2f>]
br_nf_pre_routing_finish+0x2b6/0x2c3 [bridge]
[300407.316664]  [<ffffffffa0166779>] br_nf_pre_routing_finish+0x0/0x2c3
[bridge]
[300407.316665]  [<ffffffff805ac6f0>] nf_hook_slow+0x62/0xc3
[300407.316670]  [<ffffffffa0166779>] br_nf_pre_routing_finish+0x0/0x2c3
[bridge]
[300407.316674]  [<ffffffffa01670c1>] br_nf_pre_routing+0x685/0x69f [bridge]
[300407.316676]  [<ffffffff805ac652>] nf_iterate+0x41/0x7d
[300407.316680]  [<ffffffffa0162818>] br_handle_frame_finish+0x0/0x148
[bridge]
[300407.316682]  [<ffffffff805ac6f0>] nf_hook_slow+0x62/0xc3
[300407.316686]  [<ffffffffa0162818>] br_handle_frame_finish+0x0/0x148
[bridge]
[300407.316691]  [<ffffffffa0162afb>] br_handle_frame+0x19b/0x1c0 [bridge]
[300407.316693]  [<ffffffff805947ca>] netif_receive_skb+0x2ca/0x399
[300407.316695]  [<ffffffff804bf28c>] igb_clean_rx_irq_adv+0x3c8/0x487
[300407.316697]  [<ffffffff804bf4ca>] igb_clean_rx_ring_msix+0x35/0x143
[300407.316699]  [<ffffffff8023d158>] run_timer_softirq+0x49/0x202
[300407.316700]  [<ffffffff80593269>] net_rx_action+0x71/0x175
[300407.316702]  [<ffffffff80239aa2>] __do_softirq+0x7c/0x136
[300407.316704]  [<ffffffff8020c44c>] call_softirq+0x1c/0x28
[300407.316706]  [<ffffffff8020d870>] do_softirq+0x2c/0x68
[300407.316708]  [<ffffffff8020d971>] do_IRQ+0xc5/0xe4
[300407.316709]  [<ffffffff8020b796>] ret_from_intr+0x0/0xa
[300407.316710]  <EOI>  [<ffffffff8021190f>] mwait_idle+0x3c/0x3f
[300407.316713]  [<ffffffff8020a4ce>] cpu_idle+0x40/0x7c
[300407.316715] ---[ end trace eb5e2280f5644308 ]---


I think i starts when I start using VLAN on interfaces (kernel module 
8021q)

Thanks