From: Martin Steigerwald <Martin@lichtvoll.de>
To: LKML <linux-kernel@vger.kernel.org>
Subject: [REGRESSION] 3.6-rc2 and 3.6-rc3: TCP/IP network connection hang
Date: Thu, 23 Aug 2012 22:35:53 +0200
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Hi!

Its a bit difficult to describe. With 3.6-rc2 and 3.6-rc3 on an Lenovo
ThinkPad T520 from Linus git, I get occasional network hangs:

On for example sending a small mail via SMTP to my Debian Squeeze
based server via a ASUS WL-500gP Router with
Debian Squeeze and some 2.6.34 kernel KMail hangs.

It just doesn?t complete sending out the mail.

I have seen this once with 3.6-rc2 and now also with 3.6-rc3 that I
tried cause it had quite some network fixes.

Notebook: 10.0.0.10 (IP and MAC changed)
Gateway:  10.0.0.1 (IP and MAC changed)
Server: 194.150.191.11


Below is a tshark capture of such an occurence.

I had a network hang with 3.6-rc2 with something else as well, but I do
not remember what it was and whether it was upload or download.

This is upload.


I never seen this with any previous kernel upto 3.5.2 from Greg K.H. git.


merkaba:~> tshark -ni eth0
tshark: Lua: Error during loading:
 [string "/usr/share/wireshark/init.lua"]:45: dofile has been disabled
Running as user "root" and group "root". This could be dangerous.
Capturing on eth0
  0.000000    10.0.0.10 -> 194.150.191.11 TCP 74 58915 > 25 [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 
TSval=15189797 TSecr=0 WS=128
  0.025222 194.150.191.11 -> 10.0.0.10    TCP 74 25 > 58915 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1460 
SACK_PERM=1 TSval=108848542 TSecr=15189797 WS=16
  0.025309    10.0.0.10 -> 194.150.191.11 TCP 66 58915 > 25 [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=15189822 
TSecr=108848542
  0.066680 194.150.191.11 -> 10.0.0.10    SMTP 116 S: 220 mail.lichtvoll.de ESMTP Postfix (Debian/GNU)
  0.066745    10.0.0.10 -> 194.150.191.11 TCP 66 58915 > 25 [ACK] Seq=1 Ack=51 Win=14720 Len=0 TSval=15189864 
TSecr=108848553
  0.066881    10.0.0.10 -> 194.150.191.11 SMTP 89 C: EHLO merkaba.localnet
  0.092287 194.150.191.11 -> 10.0.0.10    TCP 66 25 > 58915 [ACK] Seq=51 Ack=24 Win=5792 Len=0 TSval=108848559 
TSecr=15189864
  0.092351 194.150.191.11 -> 10.0.0.10    SMTP 206 S: 250-mail.lichtvoll.de | 250-PIPELINING | 250-SIZE 20000000 | 250-VRFY | 
250-ETRN | 250-STARTTLS | 250-ENHANCEDSTATUSCODES | 250-8BITMIME | 250 DSN
  0.092485    10.0.0.10 -> 194.150.191.11 SMTP 76 C: STARTTLS
  0.118043 194.150.191.11 -> 10.0.0.10    SMTP 96 S: 220 2.0.0 Ready to start TLS
  0.157589    10.0.0.10 -> 194.150.191.11 TCP 66 58915 > 25 [ACK] Seq=34 Ack=221 Win=15744 Len=0 TSval=15189955 
TSecr=108848566
  0.166043    10.0.0.10 -> 194.150.191.11 SSL 292 Client Hello
  0.214300 194.150.191.11 -> 10.0.0.10    TLSv1 1510 Server Hello, Certificate, Server Key Exchange, Server Hello Done
  0.214389    10.0.0.10 -> 194.150.191.11 TCP 66 58915 > 25 [ACK] Seq=260 Ack=1665 Win=18688 Len=0 TSval=15190011 
TSecr=108848589
  0.218072    10.0.0.10 -> 194.150.191.11 TLSv1 264 Client Key Exchange, Change Cipher Spec, Encrypted Handshake Message
  0.254985 194.150.191.11 -> 10.0.0.10    TLSv1 316 New Session Ticket, Change Cipher Spec, Encrypted Handshake Message
  0.258463    10.0.0.10 -> 194.150.191.11 TLSv1 135 Application Data
  0.285463 194.150.191.11 -> 10.0.0.10    TLSv1 215 Application Data
  0.287155    10.0.0.10 -> 194.150.191.11 TLSv1 151 Application Data
  0.313450 194.150.191.11 -> 10.0.0.10    TLSv1 135 Application Data
  0.313706    10.0.0.10 -> 194.150.191.11 TLSv1 183 Application Data
  0.347362 194.150.191.11 -> 10.0.0.10    TLSv1 151 Application Data
  0.349485    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP segment of a reassembled PDU]
  0.349522    10.0.0.10 -> 194.150.191.11 TLSv1 1327 Application Data
  0.350700     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  0.384716 194.150.191.11 -> 10.0.0.10    TCP 78 [TCP Dup ACK 22#1] 25 > 58915 [ACK] Seq=2218 Ack=729 Win=7936 Len=0 
TSval=108848632 TSecr=15190111 SLE=2177 SRE=3438
  0.392573    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15190190 TSecr=108848632
  0.393809     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  0.624613    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15190422 TSecr=108848632
  0.625846     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  1.089586    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15190887 TSecr=108848632
  1.090836     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  2.018584    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15191816 TSecr=108848632
  2.019846     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  3.878591    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15193676 TSecr=108848632
  3.879797     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
  5.022069 10:00:00:01:aa:bb -> 10:00:00:10:cc:dd ARP 60 Who has 10.0.0.10?  Tell 10.0.0.1
  5.022115 10:00:00:10:cc:dd -> 10:00:00:01:aa:bb ARP 42 10.0.0.10 is at 10:00:00:10:cc:dd
  7.594598    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15197392 TSecr=108848632
  7.595882     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
 15.034613    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15204832 TSecr=108848632
 15.035919     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
 29.914590    10.0.0.10 -> 194.150.191.11 TCP 1514 [TCP Retransmission] 58915 > 25 [ACK] Seq=729 Ack=2218 Win=24448 
Len=1448 TSval=15219712 TSecr=108848632
 29.915903     10.0.0.1 -> 10.0.0.10    ICMP 590 Destination unreachable (Fragmentation needed)
 34.922706 10:00:00:10:cc:dd -> 10:00:00:01:aa:bb ARP 42 Who has 10.0.0.1?  Tell 10.0.0.10
 34.923296 10:00:00:01:aa:bb -> 10:00:00:10:cc:dd ARP 60 10.0.0.1 is at 10:00:00:01:aa:bb


Thats it. Nothing more is happening.


Notebook:

martin@merkaba:~> lspci -nn | grep Ethernet 
00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network Connection [8086:1502] (rev 04)

martin@merkaba:~> cat /proc/version
Linux version 3.5.2-tp520 (martin@merkaba) (gcc version 4.7.1 (Debian 4.7.1-7) ) #1 SMP PREEMPT Sun Aug 19 12:39:04 CEST 2012


ASUS WL-500gP Premium:

gayatri:~# lspci -nn
00:00.0 Host bridge [0600]: Broadcom Corporation BCM4704 PCI to SB Bridge [14e4:4704] (rev 09)
00:02.0 Network controller [0280]: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller 
[14e4:4318] (rev 02)
00:03.0 USB Controller [0c03]: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller [1106:3038] (rev 62)
00:03.1 USB Controller [0c03]: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller [1106:3038] (rev 62)
00:03.2 USB Controller [0c03]: VIA Technologies, Inc. USB 2.0 [1106:3104] (rev 65)

gayatri:~# cat /proc/version
Linux version 2.6.34.5 (amain@amain-laptop) (gcc version 4.3.3 (GCC) ) #1 Sun Sep 26 18:20:27 CEST 2010

(I tried to compile my own, but it didn?t work out.)

The ethernet seems to be missing from above. I am using 100 MBit wire based
ethernet port. Wireless is disabled.


Server is VMware ESX on some FSC server.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
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