I want the Jenkins master to build a small project on a slave.
Slave and Master run Suse Linux.
The same user (hans) which runs Jenkins is available on both machines and has rw permissions on the slave's remote working directory (/var/jenkins).
The slave agent is launched on the slave ('ttvm3').

Building the project locally works.

When I configure the project to be build on the slave, it fails. The console output on the master is:

Started by user anonymous
Building on master in workspace /home/hans/.jenkins/jobs/testproject/workspace
Checkout:workspace / /home/hans/.jenkins/jobs/testproject/workspace - hudson.remoting.LocalChannel@11b1e39
Using strategy: Default
Last Built Revision: Revision 97957e558fed7d0b116950e09dec1c248d1d0b54 (origin/HEAD, origin/master)
Checkout:workspace / /home/hans/.jenkins/jobs/testproject/workspace - hudson.remoting.LocalChannel@11b1e39
Fetching changes from 1 remote Git repository
Fetching upstream changes from <<blablabla>>
Commencing build of Revision 69e242182e55e57b56c836a9c3a34f0232e5d56c (origin/master)
Checking out Revision 69e242182e55e57b56c836a9c3a34f0232e5d56c (origin/master)
Triggering ttvm3
ttvm3 completed with result FAILURE
Finished: FAILURE

The output on the slave for this build is:

Started by upstream project "testproject" build number 29
Building remotely on ttvm3 in workspace /ttvm3
java.io.IOException: Failed to mkdirs: /ttvm3
at hudson.FilePath.mkdirs(FilePath.java:847)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1193)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:576)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:465)
at hudson.model.Run.run(Run.java:1409)
at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)
Finished: FAILURE

It seems as if Jenkins wants to create a directory called "ttvm3" (which is the name of the slave) in the root directory of the slave.

When I (just for the fun of it) create the directory /ttvm3 on the slave and build the project again, the output for this build on the slave is:

Started by upstream project "testproject" build number 30
Building remotely on ttvm3 in workspace /ttvm3
Checkout:ttvm3 / /ttvm3 - hudson.remoting.Channel@c4931d:ttvm3
Using strategy: Default
Checkout:ttvm3 / /ttvm3 - hudson.remoting.LocalChannel@146c0f
Cloning the remote Git repository
Cloning repository origin
ERROR: Failed to clean the workspace
java.io.IOException: Unable to delete /ttvm3
at hudson.Util.deleteFile(Util.java:237)
at hudson.Util.deleteRecursive(Util.java:287)
at hudson.FilePath$9.invoke(FilePath.java:856)
at hudson.FilePath$9.invoke(FilePath.java:854)
at hudson.FilePath.act(FilePath.java:788)
at hudson.FilePath.act(FilePath.java:770)
at hudson.FilePath.deleteRecursive(FilePath.java:854)
at hudson.plugins.git.GitAPI.clone(GitAPI.java:205)
at hudson.plugins.git.GitSCM$2.invoke(GitSCM.java:1027)
at hudson.plugins.git.GitSCM$2.invoke(GitSCM.java:968)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2099)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
ERROR: Error cloning remote repo 'origin' : Failed to delete workspace
ERROR: Cause: Unable to delete /ttvm3
Trying next repository
ERROR: Could not clone repository
FATAL: Could not clone
hudson.plugins.git.GitException: Could not clone
at hudson.plugins.git.GitSCM$2.invoke(GitSCM.java:1042)
at hudson.plugins.git.GitSCM$2.invoke(GitSCM.java:968)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2099)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)