diff --git a/mitogen/master.py b/mitogen/master.py
index 04399ab1..7a9f1dd9 100644
--- a/mitogen/master.py
+++ b/mitogen/master.py
@@ -714,8 +714,8 @@ class ModuleResponder(object):
             if tup[2] and is_stdlib_path(tup[2]):
                 # Prevent loading of 2.x<->3.x stdlib modules! This costs one
                 # RTT per hit, so a client-side solution is also required.
-                LOG.warning('%r: refusing to serve stdlib module %r',
-                            self, fullname)
+                LOG.debug('%r: refusing to serve stdlib module %r',
+                          self, fullname)
                 self._send_module_load_failed(stream, fullname)
                 return
 
diff --git a/mitogen/service.py b/mitogen/service.py
index 5f6f4048..d1285386 100644
--- a/mitogen/service.py
+++ b/mitogen/service.py
@@ -542,7 +542,7 @@ class Pool(object):
                 msg = self._select.get()
             except (mitogen.core.ChannelError, mitogen.core.LatchError):
                 e = sys.exc_info()[1]
-                LOG.info('%r: channel or latch closed, exitting: %s', self, e)
+                LOG.debug('%r: channel or latch closed, exitting: %s', self, e)
                 return
 
             func = self._func_by_recv[msg.receiver]
diff --git a/tests/data/six_brokenpkg/__init__.py b/tests/data/six_brokenpkg/__init__.py
index 42e633c7..e5944b83 100644
--- a/tests/data/six_brokenpkg/__init__.py
+++ b/tests/data/six_brokenpkg/__init__.py
@@ -29,9 +29,9 @@ import os.path
 
 try:
     import six as _system_six
-    print('six_brokenpkg: using system six:', _system_six)
+    #print('six_brokenpkg: using system six:', _system_six)
 except ImportError:
-    print('six_brokenpkg: no system six available')
+    #print('six_brokenpkg: no system six available')
     _system_six = None
 
 if _system_six:
diff --git a/tests/service_test.py b/tests/service_test.py
index 0ff16032..e57548da 100644
--- a/tests/service_test.py
+++ b/tests/service_test.py
@@ -54,8 +54,13 @@ class ActivationTest(testlib.RouterMixin, testlib.TestCase):
         l1 = self.router.fork()
         l2 = self.router.fork()
         l1.call_service(MyService, 'get_id')  # force framework activation
-        exc = self.assertRaises(mitogen.core.CallError,
-            lambda: l2.call(call_service_in, l1, MyService2.name(), 'get_id'))
+        capture = testlib.LogCapturer()
+        capture.start()
+        try:
+            exc = self.assertRaises(mitogen.core.CallError,
+                lambda: l2.call(call_service_in, l1, MyService2.name(), 'get_id'))
+        finally:
+            capture.stop()
         msg = mitogen.service.Activator.not_active_msg % (MyService2.name(),)
         self.assertTrue(msg in exc.args[0])
 
@@ -80,8 +85,13 @@ class PermissionTest(testlib.RouterMixin, testlib.TestCase):
         l1 = self.router.fork()
         l1.call_service(MyService, 'get_id')
         l2 = self.router.fork()
-        exc = self.assertRaises(mitogen.core.CallError, lambda:
-            l2.call(call_service_in, l1, MyService.name(), 'privileged_op'))
+        capture = testlib.LogCapturer()
+        capture.start()
+        try:
+            exc = self.assertRaises(mitogen.core.CallError, lambda:
+                l2.call(call_service_in, l1, MyService.name(), 'privileged_op'))
+        finally:
+            capture.stop()
         msg = mitogen.service.Invoker.unauthorized_msg % (
             u'privileged_op',
             MyService.name(),
diff --git a/tests/two_three_compat_test.py b/tests/two_three_compat_test.py
index babbbe39..f6f092d0 100644
--- a/tests/two_three_compat_test.py
+++ b/tests/two_three_compat_test.py
@@ -13,6 +13,7 @@ import testlib
 def roundtrip(*args):
     return args
 
+
 class TwoThreeCompatTest(testlib.RouterMixin, testlib.TestCase):
     if mitogen.core.PY3:
         python_path = 'python2'
diff --git a/tests/unix_test.py b/tests/unix_test.py
index ee9499ba..300efb84 100644
--- a/tests/unix_test.py
+++ b/tests/unix_test.py
@@ -62,9 +62,17 @@ class ListenerTest(testlib.RouterMixin, testlib.TestCase):
 
     def test_constructor_basic(self):
         listener = self.klass(router=self.router)
-        self.assertFalse(mitogen.unix.is_path_dead(listener.path))
-        os.unlink(listener.path)
-
+        capture = testlib.LogCapturer()
+        capture.start()
+        try:
+            self.assertFalse(mitogen.unix.is_path_dead(listener.path))
+            os.unlink(listener.path)
+            # ensure we catch 0 byte read error log message
+            self.broker.shutdown()
+            self.broker.join()
+            self.broker_shutdown = True
+        finally:
+            capture.stop()
 
 class ClientTest(testlib.TestCase):
     klass = mitogen.unix.Listener