INFO: mock.py version 1.1.38 starting...
Start: init plugins
INFO: selinux enabled
Finish: init plugins
Start: run
INFO: Start(antlr-2.7.7-30.el7.src.rpm)  Config(c7.00.03-i686)
Start: lock buildroot
ERROR: Exception(antlr-2.7.7-30.el7.src.rpm) Config(c7.00.03-i686) 0 minutes 0 seconds
INFO: Results and/or logs in: logs/c7.00.03/antlr/20140610191937/2.7.7-30.el7.i386
INFO: Cleaning up build root ('clean_on_failure=True')
Start: lock buildroot
ERROR: Build root is locked by another process.