diff --git a/mitmproxy/protocol/http2.py b/mitmproxy/protocol/http2.py
index a491f8e42..881dbf834 100644
--- a/mitmproxy/protocol/http2.py
+++ b/mitmproxy/protocol/http2.py
@@ -175,7 +175,7 @@ class Http2Layer(base.Layer):
     def _handle_data_received(self, eid, event, source_conn):
         bsl = self.config.options.body_size_limit
         if bsl and self.streams[eid].queued_data_length > bsl:
-            self.streams[eid].zombie = time.time()
+            self.streams[eid].kill()
             source_conn.h2.safe_reset_stream(
                 event.stream_id,
                 h2.errors.REFUSED_STREAM
@@ -196,7 +196,7 @@ class Http2Layer(base.Layer):
         return True
 
     def _handle_stream_reset(self, eid, event, is_server, other_conn):
-        self.streams[eid].zombie = time.time()
+        self.streams[eid].kill()
         if eid in self.streams and event.error_code == h2.errors.CANCEL:
             if is_server:
                 other_stream_id = self.streams[eid].client_stream_id
@@ -302,11 +302,7 @@ class Http2Layer(base.Layer):
 
     def _kill_all_streams(self):
         for stream in self.streams.values():
-            if not stream.zombie:
-                stream.zombie = time.time()
-                stream.request_data_finished.set()
-                stream.response_arrived.set()
-                stream.data_finished.set()
+            stream.kill()
 
     def __call__(self):
         self._initiate_server_conn()
@@ -377,6 +373,9 @@ class Http2SingleStreamLayer(http._HttpTransmissionLayer, basethread.BaseThread)
         self.response_headers = None
         self.pushed = False
 
+        self.timestamp_start = None
+        self.timestamp_end = None
+
         self.request_data_queue = queue.Queue()
         self.request_queued_data_length = 0
         self.request_data_finished = threading.Event()
@@ -393,6 +392,13 @@ class Http2SingleStreamLayer(http._HttpTransmissionLayer, basethread.BaseThread)
         self.priority_weight = None
         self.handled_priority_event = None
 
+    def kill(self):
+        if not self.zombie:
+            self.zombie = time.time()
+            self.request_data_finished.set()
+            self.response_arrived.set()
+            self.response_data_finished.set()
+
     def connect(self):  # pragma: no cover
         raise exceptions.Http2ProtocolException("HTTP2 layer should already have a connection.")
 
@@ -604,5 +610,4 @@ class Http2SingleStreamLayer(http._HttpTransmissionLayer, basethread.BaseThread)
         except exceptions.Kill:
             self.log("Connection killed", "info")
 
-        if not self.zombie:
-            self.zombie = time.time()
+        self.kill()
diff --git a/netlib/debug.py b/netlib/debug.py
index 29c7f655a..f9c700de1 100644
--- a/netlib/debug.py
+++ b/netlib/debug.py
@@ -37,7 +37,7 @@ def sysinfo():
     return "\n".join(data)
 
 
-def dump_info(sig, frm, file=sys.stdout):  # pragma: no cover
+def dump_info(signal=None, frame=None, file=sys.stdout):  # pragma: no cover
     print("****************************************************", file=file)
     print("Summary", file=file)
     print("=======", file=file)
@@ -81,7 +81,7 @@ def dump_info(sig, frm, file=sys.stdout):  # pragma: no cover
     print("****************************************************", file=file)
 
 
-def dump_stacks(signal, frame, file=sys.stdout):
+def dump_stacks(signal=None, frame=None, file=sys.stdout):
     id2name = dict([(th.ident, th.name) for th in threading.enumerate()])
     code = []
     for threadId, stack in sys._current_frames().items():