diff --git a/src/core/lib/iomgr/pollset_set_windows.c b/src/core/lib/iomgr/pollset_set_windows.c
index 0b14e446ae6..720fc331edc 100644
--- a/src/core/lib/iomgr/pollset_set_windows.c
+++ b/src/core/lib/iomgr/pollset_set_windows.c
@@ -37,7 +37,7 @@
 
 #include "src/core/lib/iomgr/pollset_set_windows.h"
 
-grpc_pollset_set* grpc_pollset_set_create(pollset_set) { return NULL; }
+grpc_pollset_set* grpc_pollset_set_create(void) { return NULL; }
 
 void grpc_pollset_set_destroy(grpc_pollset_set* pollset_set) {}
 
diff --git a/src/ruby/ext/grpc/rb_byte_buffer.c b/src/ruby/ext/grpc/rb_byte_buffer.c
index db7cac363a3..9b617e13d3c 100644
--- a/src/ruby/ext/grpc/rb_byte_buffer.c
+++ b/src/ruby/ext/grpc/rb_byte_buffer.c
@@ -50,21 +50,18 @@ grpc_byte_buffer* grpc_rb_s_to_byte_buffer(char *string, size_t length) {
 }
 
 VALUE grpc_rb_byte_buffer_to_s(grpc_byte_buffer *buffer) {
-  size_t length = 0;
-  char *string = NULL;
-  size_t offset = 0;
+  VALUE rb_string;
   grpc_byte_buffer_reader reader;
   gpr_slice next;
   if (buffer == NULL) {
     return Qnil;
-
   }
-  length = grpc_byte_buffer_length(buffer);
-  string = xmalloc(length + 1);
+  rb_string = rb_str_buf_new(grpc_byte_buffer_length(buffer));
   grpc_byte_buffer_reader_init(&reader, buffer);
   while (grpc_byte_buffer_reader_next(&reader, &next) != 0) {
-    memcpy(string + offset, GPR_SLICE_START_PTR(next), GPR_SLICE_LENGTH(next));
-    offset += GPR_SLICE_LENGTH(next);
+    rb_str_cat(rb_string, (const char *) GPR_SLICE_START_PTR(next),
+               GPR_SLICE_LENGTH(next));
+    gpr_slice_unref(next);
   }
-  return rb_str_new(string, length);
+  return rb_string;
 }
diff --git a/src/ruby/ext/grpc/rb_call.c b/src/ruby/ext/grpc/rb_call.c
index cd0aa6aaf20..b0829efdc78 100644
--- a/src/ruby/ext/grpc/rb_call.c
+++ b/src/ruby/ext/grpc/rb_call.c
@@ -551,13 +551,26 @@ static void grpc_run_batch_stack_init(run_batch_stack *st,
 /* grpc_run_batch_stack_cleanup ensures the run_batch_stack is properly
  * cleaned up */
 static void grpc_run_batch_stack_cleanup(run_batch_stack *st) {
+  size_t i = 0;
+
   grpc_metadata_array_destroy(&st->send_metadata);
   grpc_metadata_array_destroy(&st->send_trailing_metadata);
   grpc_metadata_array_destroy(&st->recv_metadata);
   grpc_metadata_array_destroy(&st->recv_trailing_metadata);
+
   if (st->recv_status_details != NULL) {
     gpr_free(st->recv_status_details);
   }
+
+  if (st->recv_message != NULL) {
+    grpc_byte_buffer_destroy(st->recv_message);
+  }
+
+  for (i = 0; i < st->op_num; i++) {
+    if (st->ops[i].op == GRPC_OP_SEND_MESSAGE) {
+      grpc_byte_buffer_destroy(st->ops[i].data.send_message);
+    }
+  }
 }
 
 /* grpc_run_batch_stack_fill_ops fills the run_batch_stack ops array from
@@ -643,7 +656,6 @@ static VALUE grpc_run_batch_stack_build_result(run_batch_stack *st) {
         break;
       case GRPC_OP_SEND_MESSAGE:
         rb_struct_aset(result, sym_send_message, Qtrue);
-        grpc_byte_buffer_destroy(st->ops[i].data.send_message);
         break;
       case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
         rb_struct_aset(result, sym_send_close, Qtrue);
diff --git a/test/distrib/node/run_distrib_test.sh b/test/distrib/node/run_distrib_test.sh
index 9b8f15771b8..13a42fcb0a2 100755
--- a/test/distrib/node/run_distrib_test.sh
+++ b/test/distrib/node/run_distrib_test.sh
@@ -28,23 +28,31 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+function finish() {
+  rv=$?
+  kill $STATIC_PID || true
+  curl "localhost:32767/drop/$STATIC_PORT" || true
+  exit $rv
+}
+
+trap finish EXIT
+
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 cd $(dirname $0)
 
 nvm install $NODE_VERSION
+set -ex
 
 npm install -g node-static
 
-# Kill off existing static servers
-kill -9 $(ps aux | grep '[n]ode .*static' | awk '{print $2}') || true
-
 STATIC_SERVER=127.0.0.1
-STATIC_PORT=8080
+# If port_server is running, get port from that. Otherwise, assume we're in
+# docker and use 8080
+STATIC_PORT=$(curl 'localhost:32767/get' || echo '8080')
 
-# Serves the input_artifacts directory statically at localhost:8080
+# Serves the input_artifacts directory statically at localhost:
 static "$EXTERNAL_GIT_ROOT/input_artifacts" -a $STATIC_SERVER -p $STATIC_PORT &
 STATIC_PID=$!
 
@@ -52,6 +60,4 @@ STATIC_URL="http://$STATIC_SERVER:$STATIC_PORT/"
 
 npm install --unsafe-perm $STATIC_URL/grpc.tgz --grpc_node_binary_host_mirror=$STATIC_URL
 
-kill -9 $STATIC_PID
-
 ./distrib_test.js
diff --git a/tools/run_tests/build_artifact_node.sh b/tools/run_tests/build_artifact_node.sh
index 6aa48245383..ef3476a0381 100755
--- a/tools/run_tests/build_artifact_node.sh
+++ b/tools/run_tests/build_artifact_node.sh
@@ -30,9 +30,9 @@
 
 NODE_TARGET_ARCH=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use 4
+set -ex
 
 cd $(dirname $0)/../..
 
diff --git a/tools/run_tests/build_artifact_python.sh b/tools/run_tests/build_artifact_python.sh
index 7ba04d75463..1f23f9fade8 100755
--- a/tools/run_tests/build_artifact_python.sh
+++ b/tools/run_tests/build_artifact_python.sh
@@ -35,15 +35,18 @@ cd $(dirname $0)/../..
 if [ "$SKIP_PIP_INSTALL" == "" ]
 then
   pip install --upgrade six
-  pip install --upgrade setuptools
+  # There's a bug in newer versions of setuptools (see
+  # https://bitbucket.org/pypa/setuptools/issues/503/pkg_resources_vendorpackagingrequirementsi)
+  pip install --upgrade 'setuptools==18'
   pip install -rrequirements.txt
 fi
 
+export GRPC_PYTHON_USE_CUSTOM_BDIST=0
+export GRPC_PYTHON_BUILD_WITH_CYTHON=1
+
 # Build the source distribution first because MANIFEST.in cannot override
 # exclusion of built shared objects among package resources (for some
 # inexplicable reason).
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     sdist
 
@@ -51,15 +54,11 @@ ${SETARCH_CMD} python setup.py  \
 # and thus ought to be run in a shell command separate of others. Further, it
 # trashes the actual bdist_wheel output, so it should be run first so that
 # bdist_wheel may be run unmolested.
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     build_tagged_ext
 
 # Wheel has a bug where directories don't get excluded.
 # https://bitbucket.org/pypa/wheel/issues/99/cannot-exclude-directory
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     bdist_wheel
 
diff --git a/tools/run_tests/build_node.sh b/tools/run_tests/build_node.sh
index 9c4af071856..cbe0e31d2eb 100755
--- a/tools/run_tests/build_node.sh
+++ b/tools/run_tests/build_node.sh
@@ -31,9 +31,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 CONFIG=${CONFIG:-opt}
 
diff --git a/tools/run_tests/build_package_node.sh b/tools/run_tests/build_package_node.sh
index aca90a37500..540c8263117 100755
--- a/tools/run_tests/build_package_node.sh
+++ b/tools/run_tests/build_package_node.sh
@@ -29,9 +29,9 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use 4
+set -ex
 
 cd $(dirname $0)/../..
 
diff --git a/tools/run_tests/pre_build_node.sh b/tools/run_tests/pre_build_node.sh
index 11f46d60fc2..1f55df0b7bc 100755
--- a/tools/run_tests/pre_build_node.sh
+++ b/tools/run_tests/pre_build_node.sh
@@ -31,9 +31,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 export GRPC_CONFIG=${CONFIG:-opt}
 
diff --git a/tools/run_tests/run_node.sh b/tools/run_tests/run_node.sh
index d33890068dd..b94dc3ec628 100755
--- a/tools/run_tests/run_node.sh
+++ b/tools/run_tests/run_node.sh
@@ -30,9 +30,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 CONFIG=${CONFIG:-opt}