A new test was recently added to test-container-executor.c that has some problems.
It is attempting to mkdir() a hard-coded path: /tmp/2938rf2983hcqnw8ud/emptydir
This fails because the base directory is not there. These directories are not being cleaned up either.
It should be using TEST_ROOT.
I don't know what Jira this change was made under - the git commit from July 9 2018 does not reference a Jira.