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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