In mustang PIT b96 , test (j2se) java/net/Socket/LinkLocal.java failed on following linux box , detail system info:
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Linux 2.6.16-8-smp #1 SMP Tue Mar 28 11:00:06 UTC 2006 x86_64 x86_64 x86_64 GNU/Linux
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The .jtr file shows ( with e.printStackTrace() in test ):
**************************************
Test 1: TCP connect to /fe80:0:0:0:20c:76ff:fe16:4096%2
Test failed: java.net.ConnectException: Connection timed out
**************************************
... ...
3 test(s) executed, 1 failed.
----------System.err:(30/1673)----------
java.net.ConnectException: Connection timed out
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at java.net.Socket.connect(Socket.java:469)
        at LinkLocal.TcpTest(LinkLocal.java:28)
        at LinkLocal.TestAddress(LinkLocal.java:88)
        at LinkLocal.main(LinkLocal.java:127)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
        at java.lang.Thread.run(Thread.java:619)
java.lang.Exception: 1 test(s) failed.
        at LinkLocal.main(LinkLocal.java:143)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
        at java.lang.Thread.run(Thread.java:619)

JavaTest Message: Test threw exception: java.lang.Exception: 1 test(s) failed.

Test result can be found at :
http://sqeweb.sfbay/sec/status/pit_6.0_dtf_results/sec_6.0_regression-reg_linux-amd64-2006-08-09-17-08-40-0356/

This test passed on some other linux , but failed with the sys-info list as above.
linux-i586
PASS on "Linux 2.6.9-27.ELsmp #1 SMP Tue Dec 20 19:25:09 EST 2005 i686 i686 i386 GNU/Linux"
PASS on "Linux 2.6.5-7.97-default #1 Fri Jul 2 14:21:59 UTC 2004 i686 i686 i386 GNU/Linux"
PASS on "Linux 2.4.21-19.ELsmp #1 SMP Thu Aug 12 23:26:16 EDT 2004 i686 i686 i386 GNU/Linux"
linux-amd64
PASS on "Linux 2.6.5-7.97-smp #1 SMP Fri Jul 2 14:21:59 UTC 2004 x86_64 x86_64 x86_64 GNU/Linux"

Please let jsn-test know if you need the machine to reproduce.