netdev - Re: WARN due to local_bh_disable called with interrupts disabled

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Date:	Thu, 19 Nov 2015 22:19:21 -0000
From:	subashab@...eaurora.org
To:	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	"Jesper Dangaard Brouer" <brouer@...hat.com>,
	netfilter-devel@...r.kernel.org, pablo@...filter.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: WARN due to local_bh_disable called with interrupts disabled

>>
>> The call gic_handle_irq() sounds like a hardware IRQ func/context.
>>
>> The flush_backlog() call is due to the device is being unregistered.
>>

Yes, this is the ARM interrupt controller. It appeared as if wifi was
getting torn down around this.

>> I'm surprised to see kfree_skb() being called from hardirq context, I
>> though that was not allowed.
>>
>> AFAIK this is the reason we have: __dev_kfree_skb_any() which defer
>> freeing the SKB if (in_irq() || irqs_disabled()).
>>
>> Code:
>>  void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason
>> reason)
>>  {
>> 	if (in_irq() || irqs_disabled())
>> 		__dev_kfree_skb_irq(skb, reason);
>> 	else
>> 		dev_kfree_skb(skb);
>>  }
>
> Right, but flush_backlog() is processing packets coming from RX, that
> should have no conntracking attached at all.
>
> Might be a bug in a tunnel ?

Thanks Jesper \ Eric. I'll explore into why a conntrack entry is
associated with this skb.


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