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SubjectRe: [PATCH] __free_pages_ok oops
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   From: Andrew Morton <akpm@zip.com.au>
Date: Wed, 06 Feb 2002 22:19:32 -0800

It's only a problem if this is the final put_page(). In the
case of sendfile(), process-context code can be taught to take
a temporary reference on the page, and only release it after the network
stack is known to have finished with the page. sendfile is synchronous, yes?

Userspace can return long before the SKBs are free'd up. That SKB
free doesn't happen until the ACKs come back from the receiver.
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