linux-kernel - Re: 3.8-rc2/rc3 write() blocked on CLOSE

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Message-ID: <CADVnQy==hkO5jFH9ah3U-1Joy2D-wkRq80n0dHf6HxfRLS9Hjg@mail.gmail.com>
Date:	Thu, 10 Jan 2013 21:40:01 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Eric Wong <normalperson@...t.net>,
	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 3.8-rc2/rc3 write() blocked on CLOSE_WAIT TCP socket

On Thu, Jan 10, 2013 at 9:18 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> On Thu, 2013-01-10 at 18:01 -0800, Eric Dumazet wrote:
>
>> Hmm, it might be commit c3ae62af8e755ea68380fb5ce682e60079a4c388
>> tcp: should drop incoming frames without ACK flag set
>>
>> It seems RST should be allowed to not have ACK set.
>>
>> I'll send a fix, thanks !
>
> Yes, thats definitely the problem, sorry for that.
>
>
> [PATCH] tcp: accept RST without ACK flag
>
> commit c3ae62af8e755 (tcp: should drop incoming frames without ACK flag
> set) added a regression on the handling of RST messages.
>
> RST should be allowed to come even without ACK bit set. We validate
> the RST by checking the exact sequence, as requested by RFC 793 and
> 5961 3.2, in tcp_validate_incoming()
>
> Reported-by: Eric Wong <normalperson@...t.net>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
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