When recursively removing a directory fails you may get this error message:

ERROR: Cannot delete workspace :Unable to delete 'C:\Jenkins\workspace\master@3'. Tried 3 times (of a maximum of 3) waiting 0,1 sec between attempts.

This error message doesn't say which file that couldn't be removed so it's hard to debug / understand what has happened.

However, it looks like the file name is returned to ws-cleanup-plugin as a suppressed exception inside the thrown CompositeIOException (thrown by class PathRemover). It would be helpful if the suppressed exceptions were logged by we-cleanup-plugin.

Git client plugin does:

try {
  Util.deleteContentsRecursive(workspace);
} catch (Exception e) {
  e.printStackTrace(listener.error("Failed to clean the workspace"));

... which seems to print the suppressed exceptions