This was observed when trying to stack.sh:

2014-01-30 14:02:15.142 UTC [pool-25-thread-1] ERROR o.o.o.plugin.ConfigurationService - Error creating port : patch-int
Error : constraint violation
Details : Transaction causes multiple rows in "Port" table to have identical values (patch-int) for index on column "name". First row, with UUID c87b118f-1403-44b5-a7ae-aa18f1284119, existed in the database before this transaction and was not modified by the transaction. Second row, with UUID 8e092a97-3cb7-43c4-951b-ba9e0012e26e, was inserted by this transaction.
./run.internal.sh: line 240: 920 Killed $JAVA_HOME/bin/java ${extraJVMOpts} -Djava.io.tmpdir="${iotmpdir}/work/tmp" -Dosgi.install.area="${bdir}" -Dosgi.configuration.area="${confarea}/configuration" -Dosgi.frameworkClassPath="${fwclasspath}" -Dosgi.framework=file:"${bdir}/lib/org.eclipse.osgi-3.8.1.v20120830-144521.jar" -Djava.awt.headless=true -classpath "${CLASSPATH}" org.eclipse.equinox.launcher.Main -console -consoleLog

At this point, the OpenDaylight controller has died/exited.
The PC configuration used was:
o Mac laptop
o VMWare Fusion
o VMs running Fedora 20

The VM configuration was:
o memory sensitve VM
o OpenDaylight Virtual Edition controller
o DevStack Controller
o DevStack Compute