diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index cfbf0ade25..35e00249b0 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -27,7 +27,7 @@ steps:
     architecture: 'x64'
 
 - script: |
-    python -m pip install --upgrade pip setuptools wheel numpy tox setuptools-scm cython
+    python -m pip install --upgrade pip setuptools wheel numpy tox setuptools-scm cython psutil
   displayName: 'Install dependencies'
 
 - script: |
diff --git a/tiledb/tests/common.py b/tiledb/tests/common.py
index af594cf91e..c2acaf85e6 100644
--- a/tiledb/tests/common.py
+++ b/tiledb/tests/common.py
@@ -4,9 +4,11 @@
 import os
 import shutil
 import tempfile
+import traceback
 from unittest import TestCase
 
 class DiskTestCase(TestCase):
+    pathmap = dict()
 
     def setUp(self):
         prefix = 'tiledb-' + self.__class__.__name__
@@ -20,8 +22,14 @@ def tearDown(self):
             except OSError as exc:
                 print("test '{}' error deleting '{}'".format(self.__class__.__name__,
                                                              dirpath))
-                raise
+                print("registered paths and originating functions:")
+                for path,frame in self.pathmap.items():
+                    print("  '{}' <- '{}'".format(path,frame))
+                raise exc
 
     def path(self, path):
-        return os.path.abspath(os.path.join(self.rootdir, path))
+        out = os.path.abspath(os.path.join(self.rootdir, path))
+        frame = traceback.extract_stack(limit=2)[-2][2]
+        self.pathmap[out] = frame
+        return out
 
diff --git a/tiledb/tests/test_libtiledb.py b/tiledb/tests/test_libtiledb.py
index cb8c94377d..bead3d02cc 100644
--- a/tiledb/tests/test_libtiledb.py
+++ b/tiledb/tests/test_libtiledb.py
@@ -1559,9 +1559,9 @@ def test_pickle_roundtrip(self):
             with io.BytesIO() as buf, tiledb.DenseArray(uri) as V:
                 pickle.dump(V, buf)
                 buf.seek(0)
-                V2 = pickle.load(buf)
-                # make sure anonymous view pickles and round-trips
-                assert_array_equal(V, V2)
+                with pickle.load(buf) as V2:
+                    # make sure anonymous view pickles and round-trips
+                    assert_array_equal(V, V2)
 
     def test_pickle_with_config(self):
         import io, pickle