diff --git a/ietf/submit/checkers.py b/ietf/submit/checkers.py
index b7d8d6026..991e86fe0 100644
--- a/ietf/submit/checkers.py
+++ b/ietf/submit/checkers.py
@@ -9,7 +9,6 @@ import shutil
 import tempfile
 import StringIO
 
-from collections import deque
 from django.conf import settings
 
 import debug                            # pyflakes:ignore
@@ -19,8 +18,6 @@ from ietf.utils.models import VersionInfo
 from ietf.utils.pipe import pipe
 from ietf.utils.test_runner import set_coverage_checking
 
-cmd_pipe_results = deque([], 4)
-
 class DraftSubmissionChecker():
     name = ""
 
@@ -74,8 +71,6 @@ class DraftIdnitsChecker(object):
         Error and warning list items are tuples:
             (line_number, line_text, message)
         """
-        global cmd_pipe_results
-
         items = []
         errors = 0
         warnings = 0
@@ -85,7 +80,6 @@ class DraftIdnitsChecker(object):
 
         cmd = "%s %s %s" % (settings.IDSUBMIT_IDNITS_BINARY, self.options, path)
         code, out, err = pipe(cmd)
-        cmd_pipe_results.append((code, out, err))
         if code != 0 or out == "":
             message = "idnits error: %s:\n  Error %s: %s" %( cmd, code, err)
             log(message)
@@ -210,7 +204,6 @@ class DraftYangChecker(object):
                 cmd_version = VersionInfo.objects.get(command=command).version
                 cmd = cmd_template.format(libs=modpath, model=path)
                 code, out, err = pipe(cmd)
-                cmd_pipe_results.append((code, out, err))
                 if code > 0 or len(err.strip()) > 0 :
                     error_lines = err.splitlines()
                     assertion('len(error_lines) > 0')
@@ -242,10 +235,9 @@ class DraftYangChecker(object):
                     cmd = cmd_template.format(model=path, rfclib=settings.SUBMIT_YANG_RFC_MODEL_DIR, tmplib=workdir,
                         draftlib=settings.SUBMIT_YANG_DRAFT_MODEL_DIR, ianalib=settings.SUBMIT_YANG_IANA_MODEL_DIR, )
                     code, out, err = pipe(cmd)
-                    cmd_pipe_results.append((code, out, err))
                     if code > 0 or len(err.strip()) > 0:
-                        error_lines = err.splitlines()
-                        for line in error_lines:
+                        err_lines = err.splitlines()
+                        for line in err_lines:
                             if line.strip():
                                 try:
                                     if 'err : ' in line:
diff --git a/ietf/submit/tests.py b/ietf/submit/tests.py
index c05be6a3e..1e8f3da05 100644
--- a/ietf/submit/tests.py
+++ b/ietf/submit/tests.py
@@ -31,8 +31,6 @@ from ietf.message.models import Message
 from ietf.name.models import FormalLanguageName
 from ietf.person.models import Person
 from ietf.person.factories import UserFactory, PersonFactory
-from ietf.submit.checkers import cmd_pipe_results
-
 from ietf.submit.models import Submission, Preapproval
 from ietf.submit.mail import add_submission_email, process_response_email
 from ietf.utils.mail import outbox, empty_outbox
@@ -1039,7 +1037,6 @@ class SubmitTests(TestCase):
         q = PyQuery(r.content)
         #
         self.assertContains(r, u'The yang validation returned 1 error')
-        self.assertIn('illegal keyword', cmd_pipe_results[-2][2])
         #
         m = q('#yang-validation-message').text()
         for command in ['xym', 'pyang', 'yanglint']:
diff --git a/ietf/utils/test_runner.py b/ietf/utils/test_runner.py
index 3d4d19b07..4892d26b2 100644
--- a/ietf/utils/test_runner.py
+++ b/ietf/utils/test_runner.py
@@ -80,6 +80,7 @@ old_destroy = None
 old_create = None
 
 template_coverage_collection = None
+code_coverage_collection = None
 url_coverage_collection = None
 
 
@@ -223,15 +224,18 @@ def save_test_results(failures, test_labels):
 
 def set_coverage_checking(flag=True):
     global template_coverage_collection
+    global code_coverage_collection
     global url_coverage_collection
     if settings.SERVER_MODE == 'test':
         if flag:
             settings.TEST_CODE_COVERAGE_CHECKER.collector.resume()
             template_coverage_collection = True
+            code_coverage_collection = True
             url_coverage_collection = True
         else:
             settings.TEST_CODE_COVERAGE_CHECKER.collector.pause()
             template_coverage_collection = False
+            code_coverage_collection = False
             url_coverage_collection = False
 
 class CoverageReporter(Reporter):
@@ -521,7 +525,6 @@ class IetfTestRunner(DiscoverRunner):
             settings.TEMPLATES[0]['OPTIONS']['loaders'] = ('ietf.utils.test_runner.TemplateCoverageLoader',) + settings.TEMPLATES[0]['OPTIONS']['loaders']
 
             settings.MIDDLEWARE = ('ietf.utils.test_runner.record_urls_middleware',) + tuple(settings.MIDDLEWARE)
-            url_coverage_collection = True
 
             self.code_coverage_checker = settings.TEST_CODE_COVERAGE_CHECKER
             if not self.code_coverage_checker._started:
@@ -628,7 +631,7 @@ class IetfTestRunner(DiscoverRunner):
         return test_apps, test_paths
 
     def run_tests(self, test_labels, extra_tests=[], **kwargs):
-        global old_destroy, old_create, test_database_name, template_coverage_collection
+        global old_destroy, old_create, test_database_name, template_coverage_collection, code_coverage_collection, url_coverage_collection
         from django.db import connection
         from ietf.doc.tests import TemplateTagTest
 
@@ -652,6 +655,8 @@ class IetfTestRunner(DiscoverRunner):
 
         if self.check_coverage:
             template_coverage_collection = True
+            code_coverage_collection = True
+            url_coverage_collection = True
             extra_tests += [
                 CoverageTest(test_runner=self, methodName='interleaved_migrations_test'),
                 CoverageTest(test_runner=self, methodName='url_coverage_test'),