Fw: [Bug 45571] New: The kernel disallows to reuse sockets which have TIME_WAIT pending connections

Begin forwarded message:

Date: Sat,  4 Aug 2012 11:13:11 +0000 (UTC)
From: bugzilla-daemon@bugzilla.kernel.org
To: shemminger@linux-foundation.org
Subject: [Bug 45571] New: The kernel disallows to reuse sockets which have TIME_WAIT pending connections


https://bugzilla.kernel.org/show_bug.cgi?id=45571

           Summary: The kernel disallows to reuse sockets which have
                    TIME_WAIT pending connections
           Product: Networking
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IPV4
        AssignedTo: shemminger@linux-foundation.org
        ReportedBy: t.artem@mailcity.com
        Regression: No


This is a follow up of the following bug report:
http://bugs.winehq.org/show_bug.cgi?id=26031

It's not Wine's problem, as it can be easily reproduced with native Linux
applications.

Bruno Jesus 2011-11-10 21:35:54 CST wrote:

Well, after reading a lot of internet pages and trying several different
attempts I think it's possible to say that it's a kernel bug or a
characteristic of the kernel tcp implementation.

The attached patch forces SO_REUSEADDR in before every bind in an attempt to
fix the problem but it only works if the program exits cleanly (so the kernel
sets the socket to TIME_WAIT), if you do "wineserver -k" the socket will remain
opened in an unknow broken state and no applications will be able to use it
(wine or native linux apps).

Output of strace:
getsockopt(24, SOL_SOCKET, SO_REUSEADDR, [0], [4]) = 0
setsockopt(24, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
bind(24, {sa_family=AF_INET, sin_port=htons(43012), sin_addr=inet_addr("0.     
0.0.0")}, 16) = -1 EADDRINUSE (Address already in use)

It's possible to see that I'm checking if SO_REUSEADDR is enabled and then
enable it. But the bind fails anyway.

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