[JENKINS-26141] Failed to mkdirs IOException if Configuration Matrix's Name is empty

If the Configuration Matrix's Name field is empty, the build will immediately fail with:

java.io.IOException: Failed to mkdirs: /ubuntu-x86_64

	at hudson.FilePath.mkdirs(FilePath.java:1154)

	at hudson.model.AbstractProject.checkout(AbstractProject.java:1258)

	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)

	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)

	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)

	at hudson.model.Run.execute(Run.java:1759)

	at hudson.matrix.MatrixRun.run(MatrixRun.java:146)

	at hudson.model.ResourceController.execute(ResourceController.java:89)

	at hudson.model.Executor.run(Executor.java:240)

The line right before makes it seem like it's trying to build in the root directory (probably creating an invalid path somehow):

Building remotely on ubuntu-x86_64 (linux) in workspace /ubuntu-x86_64

When I set the Name to "slaves" (why do I need to set a name anyways?), the line will be:

Building remotely on ubuntu-x86_64 (linux) in workspace /home/jenkins/workspace/myproject/slaves/ubuntu-x86_64

---
Originally reported by kainjow, imported from: Failed to mkdirs IOException if Configuration Matrix's Name is empty

• assignee: kohsuke
  
• status: Open
  
• priority: Minor
  
• component(s): matrix-project-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 3
  
• imported: 2025-12-06
  

Raw content of original issue

If the Configuration Matrix's Name field is empty, the build will immediately fail with:




java.io.IOException: Failed to mkdirs: /ubuntu-x86_64

	at hudson.FilePath.mkdirs(FilePath.java:1154)

	at hudson.model.AbstractProject.checkout(AbstractProject.java:1258)

	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)

	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)

	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)

	at hudson.model.Run.execute(Run.java:1759)

	at hudson.matrix.MatrixRun.run(MatrixRun.java:146)

	at hudson.model.ResourceController.execute(ResourceController.java:89)

	at hudson.model.Executor.run(Executor.java:240)





The line right before makes it seem like it's trying to build in the root directory (probably creating an invalid path somehow):




Building remotely on ubuntu-x86_64 (linux) in workspace /ubuntu-x86_64





When I set the Name to "slaves" (why do I need to set a name anyways?), the line will be:




Building remotely on ubuntu-x86_64 (linux) in workspace /home/jenkins/workspace/myproject/slaves/ubuntu-x86_64

• environment: OS X 10.10.1, Ubuntu 14.04.1

Start with the workspace and checkout paths shown in the stack trace, especially MatrixRun.run and AbstractProject.checkout, and reproduce a build with an empty Configuration Matrix Name. Trace how the workspace path is formed; done means the build no longer attempts /ubuntu-x86_64 or fails to create its workspace when the Name is empty.

Written by the indexing model from the issue text.