Re: [BUG] skb corruption and kernel panic at forwarding with fragmentation

[Konstantin Khlebnikov]

On Thu, Jan 7, 2016 at 2:59 PM, Eric Dumazet <edumazet@xxxxxxxxxx> wrote:
> On Thu, Jan 7, 2016 at 6:38 AM, Konstantin Khlebnikov <koct9i@xxxxxxxxx> wrote:
>>
>> Also I've found strange thing: reason of expanding skb->cb from 40 to
>> 48 bypes in 2006
>> 3e3850e989c5d2eb1aab6f0fd9257759f0f4cbc6 was that struct inet6_skb_parm does
>> not fit. But it's is only 24 bytes. Does some arches add pad after
>> each _u16 field?
>
> "struct inet6_skb_parm" is part of struct tcp_skb_cb
>
> This is why Patrick had to increase skb->cb[]

Whoa. Funny. TCP moves that chunk back and forward instead of just
putting it at the first place in struct.
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