FULL PRODUCT VERSION :

java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)

and

java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode)

But not in:


java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux isidore 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
Segmentation fault occurs. here is gdb stack trace (no symbols, sorry):

(gdb) bt
#0 0x00007f6698a19df4 in Java_java_net_PlainDatagramSocketImpl_send () from /opt/installs/jdk/sun-jdk1.6.0_14/jre/lib/amd64/libnet.so
#1 0x00007f66fc89ff50 in ?? ()
#2 0x0000000041195810 in ?? ()
#3 0x0000000041195be8 in ?? ()
#4 0x00000000411b3800 in ?? ()
#5 0x00007f66985e9698 in ?? ()
#6 0x00007f669a214c28 in ?? ()
#7 0x00007f66985e9700 in ?? ()
#8 0x00007f669a218d00 in ?? ()
#9 0x0000000000000000 in ?? ()


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
  To recreate this problem, checkout the mobicents media server source code and build it with maven:

svn checkout http://mobicents.googlecode.com/svn/tags/servers/media/2.x.y/jsr-309/mobicents-jsr309-impl-2.0.0.BETA2

cd mobicents-jsr309-impl-2.0.0.BETA2
mvn test

a test of the MGCP component faults on sending a datagram.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Segmentation fault is not expected.
ACTUAL -
16:57:06,111 DEBUG [TransactionHandler] Send command event to /127.0.0.1, message
CRCX 1 /mobicents/media/IVR/$@127.0.0.1:2427 MGCP 1.0
C: 1
M: sendonly
N: ###@###.###:2727
Z2: /mobicents/media/packetrelay/$@127.0.0.1:2427

Segmentation fault (core dumped)
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
If downloading the mobicents code and running the test is not acceptable please let me know. I will take the time to isolate better.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Don't use a later version of jdk6 with mobicents.

Release Regression From : 6u13
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.