a problem tcp_v4_err()

[Alexey Kuznetsov]

Hello!

I looked at tcp_v4_err() and found something strange. Quite non-trivial operations
are performed on unlocked sockets. It looks like at least this BUG_ON():

                skb = tcp_write_queue_head(sk);
                BUG_ON(!skb);

can be easily triggered.

Do I miss something?

Alexey
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