kern/102653: TCP stack sends infinite retries for connection in LAST_ACK state

Radim Kolar hsn at netmag.cz
Tue Aug 29 18:20:23 UTC 2006


>Number:         102653
>Category:       kern
>Synopsis:       TCP stack sends infinite retries for connection in LAST_ACK state
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Aug 29 18:20:19 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Radim Kolar
>Release:        FreeBSD 6.1-STABLE i386
>Organization:
>Environment:
System: FreeBSD sanatana.dharma 6.1-STABLE FreeBSD 6.1-STABLE #3: Fri Aug 25 12:13:08 CEST 2006 root at sanatana.dharma:/usr/obj/usr/src/sys/UP i386

	
>Description:
I discovered that my machine sends infinite retries for these 2 connections:

tcp4       0      0  sanatana.61564         mail.xsec.it.http      LAST_ACK
tcp4       0      0  sanatana.59795         www.xiti.dk.http       LAST_ACK

it sends packets every 2 seconds or so and gets no reply from remote 
computer:

20:07:14.855393 IP sanatana.dharma.61564 > mail.xsec.it.http: . ack 1 win 0
20:07:14.855593 IP sanatana.dharma.61564 > mail.xsec.it.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42851121 1376192245>
20:07:14.855662 IP sanatana.dharma.59795 > www.xiti.gr.http: . ack 1 win 0
20:07:14.855797 IP sanatana.dharma.59795 > www.xiti.gr.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42851121 2800342>
20:07:16.726973 IP sanatana.dharma.61564 > mail.xsec.it.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42852993 1376192245>
20:07:17.214834 IP sanatana.dharma.59795 > www.xiti.gr.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42853481 2800342>
20:07:17.344771 IP sanatana.dharma.61564 > mail.xsec.it.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42853611 1376192245>
20:07:17.954631 IP sanatana.dharma.59795 > www.xiti.gr.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42854221 2800342>
20:07:18.380573 IP sanatana.dharma.61564 > mail.xsec.it.http: F 1:1(0) ack 1 win
 32832 <nop,nop,timestamp 42854647 1376192245>
20:07:19.234371 IP sanatana.dharma.59795 > www.xiti.gr.http: F 1:1(0) ack 1 win
  32832 <nop,nop,timestamp 42855501 2800342>

I watched this activity for about 15 minutes, so my guess is that bsd box never
gives up.
	
>How-To-Repeat:
	
>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted:


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