From: Val Henson <val@nmt.edu>
To: kuznet@ms2.inr.ac.ru
Cc: davem@redhat.com, linux-kernel@vger.kernel.org
Subject: Lost TCP retransmission timer (was Re: tcp connection hangs on connect)
Date: Thu, 30 Aug 2001 12:10:25 -0600 [thread overview]
Message-ID: <20010830121025.A15880@boardwalk> (raw)
In-Reply-To: <20010829195259.B11544@boardwalk> <200108301621.UAA05134@ms2.inr.ac.ru>
In-Reply-To: <200108301621.UAA05134@ms2.inr.ac.ru>; from kuznet@ms2.inr.ac.ru on Thu, Aug 30, 2001 at 08:21:16PM +0400
On Thu, Aug 30, 2001 at 08:21:16PM +0400, kuznet@ms2.inr.ac.ru wrote:
>
> Your hopes were groundless.
> Actually, you could change subject, this apparently has nothing
> to do with your problem and this is misleading.
You're right. I thought the subject was "tcp connection hangs." :)
> I have no idea what happens in your case, apparently, retransmission
> timer is lost on sender, which is absolutely impossible. :-)
> Well, send me cat of /proc/tcp after the stall happened.
At least one of the tcpdumps I took showed at least one successful
retransmission before the failure. Here's /proc/tcp at 1 second
intervals, starting just before the connection starts and ending after
I kill it. It looks to me like the timer is going off but the segment
isn't getting transmitted.
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 00000000:00000000 02:000AFC42 00000000 0 0 1502 3 c05c0040 21 4 5 2 -1
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 00000000:00000000 02:000AFBDD 00000000 0 0 1502 2 c05c0040 21 4 5 2 -1
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 00003890:00000000 01:00000011 00000000 0 0 1502 9 c05c0040 21 4 1 2 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:00000007 00000001 0 0 1502 15 c05c0040 46 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:000000B5 00000003 0 0 1502 15 c05c0040 184 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:0000004F 00000003 0 0 1502 15 c05c0040 184 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:00000159 00000004 0 0 1502 15 c05c0040 368 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:000000F3 00000004 0 0 1502 15 c05c0040 368 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:0000008D 00000004 0 0 1502 15 c05c0040 368 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:00000027 00000004 0 0 1502 15 c05c0040 368 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:000002A1 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:0000023B 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:000001D5 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:0000016F 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:00000109 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:000000A3 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 773 1 c05c0360 300 0 0 2 -1
1: C6116429:0016 C611642A:046B 01 000032E8:00000000 01:0000003D 00000005 0 0 1502 15 c05c0040 736 4 1 1 2
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
0: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 7
next prev parent reply other threads:[~2001-08-30 18:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20010828171705.F890@boardwalk>
[not found] ` <20010829082405.A5966@cubit.at>
2001-08-30 0:20 ` tcp connection hangs on connect Val Henson
2001-08-30 0:55 ` David S. Miller
2001-08-30 1:53 ` Val Henson
2001-08-30 16:21 ` kuznet
2001-08-30 18:10 ` Val Henson [this message]
2001-08-30 21:56 ` Lost TCP retransmission timer David S. Miller
2001-08-30 22:11 ` Val Henson
2001-09-01 14:36 ` kuznet
2001-09-04 21:07 ` Val Henson
2001-09-05 15:23 ` kuznet
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