From: Thomas De Schampheleire <[email protected]>
Date: Tue, 12 Jul 2011 11:23:28 +0200
> Note that the reason we are seeing this problem, may be because the
> kernel we are using contains some patches from Freescale.
> Specifically, in dev_queue_xmit(), support is added for hardware queue
> handling, just before entering the rcu_read_lock_bh():
>
> if (dev->features & NETIF_F_HW_QDISC) {
> txq = dev_pick_tx(dev, skb);
> return dev_hard_start_xmit(skb, dev, txq);
> }
>
> /* Disable soft irqs for various locks below. Also
> * stops preemption for RCU.
> */
> rcu_read_lock_bh();
>
> We just tried moving the escaping to dev_hard_start_xmit() after
> taking the lock, but this gives a large number of other problems, e.g.
This is definitely why you are seeing this behavior.
You cannot invoke dev_hard_start_xmit() without softirqs
being disabled. It breaks everything.
This is what happens when you integrate networking patches
which were not reviewed and vetted on netdev.
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