There is bug in the receive path of the asix driver at the time a packet is received larger than MTU size and DF bit set: BUG: unable to handle kernel paging request at 0000004000000001 IP: [] skb_release_head_state+0x2d/0xd2 ... Call Trace: [] ? skb_release_all+0x9/0x1e [] ? __kfree_skb+0x9/0x6f [] ? asix_rx_fixup_internal+0xff/0x1ae [asix] [] ? usbnet_bh+0x4f/0x226 [usbnet] ... It is easily reproducable by setting an MTU of 512 e. g. and sending something like ping -s 1472 -c 1 -M do $SELF from another box. And this is because the rx->ax_skb is freed on error, but rx->ax_skb is not reset, and the size is not reset to zero in this case. And since the skb is added again to the usbnet->done skb queue it is accessing already freed memory, resulting in the BUG when freeing a 2nd time. I therefore think the value 0x0000004000000001 show in the trace is more or less random data. Signed-off-by: Holger Eitzenberger Index: linux-stable-3.8.y/drivers/net/usb/asix_common.c =================================================================== --- linux-stable-3.8.y.orig/drivers/net/usb/asix_common.c 2013-05-02 11:28:32.000000000 +0200 +++ linux-stable-3.8.y/drivers/net/usb/asix_common.c 2013-05-03 11:33:00.000000000 +0200 @@ -100,6 +100,9 @@ netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n", rx->size); kfree_skb(rx->ax_skb); + rx->ax_skb = NULL; + rx->size = 0U; + return 0; } -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html