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Date: Fri,  5 Nov 1999 06:32:29 -0800 (PST)
From: br@itchigo.com
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Subject: kern/14722: TCP connections hangs in FIN_WAIT_2 for >30min
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>Number:         14722
>Category:       kern
>Synopsis:       TCP connections hangs in FIN_WAIT_2 for >30min
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov  5 06:40:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator:     Bodo Rüskamp
>Release:        FreeBSD 3.3-STABLE
>Organization:
Itchigo Communications GmbH
>Environment:
FreeBSD alice.itchigo.com 3.3-STABLE FreeBSD 3.3-STABLE #2: Sat Oct 16 18:15:10 CEST 1999     roof@alice.itchigo.com:/usr/src/sys/compile/ALICE  i386

>Description:
A TCP connection hangs in FIN_WAIT_2 after the server process died.
The remote machine keeps sending TCP packets so that the TCP socket
won't go away. The socket is blocked, and the server cannot restart.

Captured output from tcpdump follows.
A is the local host, where the server died.
B is the remote host, where the connection originated.

15:19:28.851890 A.11110 > B.1720: . ack 1 win 4128 (ttl 246, id 102)
15:19:28.851931 B.1720 > A.11110: . ack 1 win 16680 (DF) (ttl 64, id 59322)
15:20:28.890800 A.11110 > B.1720: . ack 1 win 4128 (ttl 246, id 103)
15:20:28.890830 B.1720 > A.11110: . ack 1 win 16680 (DF) (ttl 64, id 59673)
15:21:28.936971 A.11110 > B.1720: . ack 1 win 4128 (ttl 246, id 104)
15:21:28.936995 B.1720 > A.11110: . ack 1 win 16680 (DF) (ttl 64, id 60213)

The server process died at 14:47.

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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