Date: Wed, 8 Jun 2011 19:50:32 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-java@freebsd.org> Subject: jdk opening connection to self on socket creation Message-ID: <82AE59EF1F6D4E7FA7AF3E2CD549278B@multiplay.co.uk>
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I'm trying to find a bug which looks like its in the jdk
where by when you create a ServerSocket in java it opens
a connection to itself on loopback prior to creating
the requested socket.
This wouldn't be an issue if it was cleanly shutting dow
said socket but it isn't. This is preventing jail clean
shutdown in a timely manor as the socket is left in
TIME_WAIT.
The following code causes this behviour:-
import java.net.InetAddress;
import java.net.ServerSocket;
public class Main {
public static void main(String[] args) throws java.io.IOException {
InetAddress inetaddress = InetAddress.getByName( "10.10.0.21" );
ServerSocket d = new ServerSocket(25665, 0, inetaddress);
System.out.println( "Done" );
}
}
If you then perform a netstat -na | grep 127.0.0.1 you
will see the offending socket e.g.
tcp4 0 0 127.0.0.1.26948 127.0.0.1.46429 TIME_WAIT
This looks like it might be caused by libnet.so in the jre
being loaded bi SocketAddres?
write(1,"[Loaded java.net.SocksSocketImpl"...,74) = 74 (0x4a)
stat("/usr/local/openjdk6/jre/lib/amd64/libnet.so",{ mode=-rwxr-xr-x ,inode=76507,size=98571,blksize=98816 }) = 0 (0x0)
socket(PF_INET,SOCK_STREAM,0) = 5 (0x5)
listen(0x5,0x1,0x0,0x1a,0x2,0x80535a8b8) = 0 (0x0)
getsockname(5,{ AF_INET 0.0.0.0:12095 },0x7fffffbfe37c) = 0 (0x0)
socket(PF_INET,SOCK_STREAM,0) = 6 (0x6)
connect(6,{ AF_INET 127.0.0.1:12095 },16) = 0 (0x0)
fcntl(5,F_GETFL,) = 2 (0x2)
fcntl(5,F_SETFL,O_NONBLOCK|0x2) = 0 (0x0)
accept(5,{ AF_INET 127.0.0.1:38895 },0x7fffffbfe37c) = 7 (0x7)
shutdown(6,SHUT_RDWR) = 0 (0x0)
close(7) = 0 (0x0)
close(5) = 0 (0x0)
lseek(3,0x2cce5e0,SEEK_SET) = 46982624 (0x2cce5e0)
read(3,"PK\^C\^D\n\0\0\0\0\0I\M^W{>\M-/"...,30) = 30 (0x1e)
lseek(3,0x2cce61e,SEEK_SET) = 46982686 (0x2cce61e)
read(3,"\M-J\M-~\M-:\M->\0\0\0001\0z\n\0"...,3028) = 3028 (0xbd4)
lseek(3,0x2cce4b9,SEEK_SET) = 46982329 (0x2cce4b9)
read(3,"PK\^C\^D\n\0\0\0\0\0G\M^W{>K0"...,30) = 30 (0x1e)
lseek(3,0x2cce4f3,SEEK_SET) = 46982387 (0x2cce4f3)
read(3,"\M-J\M-~\M-:\M->\0\0\0001\0\^O\n"...,237) = 237 (0xed)
write(1,"[Loaded java.net.SocketAddress f"...,72) = 72 (0x48)
Any ideas?
Regards
Steve
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