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SubjectRe: TCP Segmentation Offloading (TSO)

> Skb may have some pages in its skb_shared_info as frags, but each
> page may not have extra space in it while csum_partial() is used
> to compute checksum against each page.
> We can see skb_checksum() calls csum_partial() againt each page in skb.
> No one knows whether the next page exits or not as it may be mapped
> in kmap space.

It's sad that it happened on my machine.
And Oops said csum_partial() tried to accesse the next page which was not
kmapped yet.

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