On Mon, Aug 01, 2005 at 08:33:20AM +0000, Guillaume Pelat wrote:
>
> I just tried the patch attached. :)
>
> The bug is still here (same symptoms), with a slightly different backtrace :
> ------------[ cut here ]------------
> kernel BUG at net/ipv4/tcp_output.c:918!
OK, let's try again :)
I bet it's the tcp_enter_cwr() call in tcp_transmit_skb(). So
the sequence is:
tcp_write_xmit
cwnd_quota = tcp_cwnd_test
tcp_transmit_skb
tcp_enter_cwr
tp->snd_cwnd = min(tp->snd_cwnd, in_flight + 1)
At this point cwnd_quota is out-of-sync with tp->snd_cwnd.
cwnd_quota -= tcp_skb_pcount(skb)
cwnd_quota > 0
tcp_tso_should_defer
BUG since tp->snd_cwnd is smaller than what
cwnd_quota indicated.
So I suppose we should reset cwnd_quota after tcp_transmit_skb?
Perhaps we should only transmit one MSS in this case?
Cheers,
--
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