INFO: mock.py version 1.1.38 starting...
Start: init plugins
INFO: tmpfs initialized
INFO: selinux disabled
Finish: init plugins
Start: run
INFO: Start(/mnt/dar/packages/dkms/dkms-2.2.0.3-21.fc20.art.src.rpm)  Config(fedora-15-i386)
Start: lock buildroot
Start: clean chroot
ERROR: Exception(/mnt/dar/packages/dkms/dkms-2.2.0.3-21.fc20.art.src.rpm) Config(fedora-15-i386) 0 minutes 2 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-15-i386/result
Traceback (most recent call last):
  File "/usr/sbin/mock", line 306, in <module>
    def do_buildsrpm(config_opts, chroot, options, args):
  File "/usr/sbin/mock", line 630, in main
    do_rebuild(config_opts, chroot, args)
  File "<peak.util.decorators.rewrap wrapping __main__.do_rebuild at 0x02A81320>", line 3, in do_rebuild
  File "/usr/lib/python2.7/site-packages/mockbuild/trace_decorator.py", line 70, in trace
    result = func(*args, **kw)
  File "/usr/sbin/mock", line 276, in do_rebuild
    chroot.clean()
  File "<peak.util.decorators.rewrap wrapping mockbuild.backend.clean at 0x02A58C80>", line 3, in clean
  File "/usr/lib/python2.7/site-packages/mockbuild/trace_decorator.py", line 70, in trace
    result = func(*args, **kw)
  File "/usr/lib/python2.7/site-packages/mockbuild/backend.py", line 205, in clean
    self._unlock_and_rm_chroot()
  File "<peak.util.decorators.rewrap wrapping mockbuild.backend._unlock_and_rm_chroot at 0x02A7F1B8>", line 3, in _unlock_and_rm_chroot
  File "/usr/lib/python2.7/site-packages/mockbuild/trace_decorator.py", line 70, in trace
    result = func(*args, **kw)
  File "/usr/lib/python2.7/site-packages/mockbuild/backend.py", line 216, in _unlock_and_rm_chroot
    mockbuild.util.rmtree(t, selinux=self.selinux)
  File "<peak.util.decorators.rewrap wrapping mockbuild.util.rmtree at 0x02A37DE8>", line 3, in rmtree
  File "/usr/lib/python2.7/site-packages/mockbuild/trace_decorator.py", line 70, in trace
    result = func(*args, **kw)
  File "/usr/lib/python2.7/site-packages/mockbuild/util.py", line 96, in rmtree
    shutil.rmtree(path, *args, **kargs)
  File "/usr/lib64/python2.7/shutil.py", line 247, in rmtree
    rmtree(fullname, ignore_errors, onerror)
  File "/usr/lib64/python2.7/shutil.py", line 256, in rmtree
    onerror(os.rmdir, path, sys.exc_info())
  File "/usr/lib64/python2.7/shutil.py", line 254, in rmtree
    os.rmdir(path)
OSError: [Errno 16] Device or resource busy: '/var/lib/mock/fedora-15-i386.tmp/root'