The following error is encountered under the following circumstances:

• Java version:
  $ java -version
  java version "1.6.0_11"
  Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
  Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)

• Freestyle project with a single ant step

• Custom workspace specified

Error:

Started by user anonymous
[] $ cmd.exe /C '"ant.bat -file build.xml -DlabelName=jg test && exit
%%ERRORLEVEL%%"'
Buildfile: build.xml

test:
[echo] Hello

BUILD SUCCESSFUL
Total time: 0 seconds
FATAL: Releasing unallocated workspace c:/build/test-multi_mainline_asc/
java.lang.AssertionError: Releasing unallocated workspace
c:/build/test-multi_mainline_asc/
at hudson.slaves.WorkspaceList.release(WorkspaceList.java:74)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:365)
at hudson.model.Run.run(Run.java:1090)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:122)