Fix kill id missing

nat-lab/tests/utils/tcpdump.py

@@ -44,9 +44,7 @@ def __init__(
         self.count = count
         self.stdout = ""
         self.stderr = ""
-        self.kill_id = (
-            "DO_NOT_KILL" + secrets.token_hex(8).upper() if session else None,
-        )
+        self.kill_id = "DO_NOT_KILL" + secrets.token_hex(8).upper() if session else None
 
         self.output_notifier.notify_output("listening on", self.start_event)
 
@@ -141,9 +139,14 @@ async def run(self) -> AsyncIterator["TcpDump"]:
             except TimeoutError as e:
                 print("tcpdump timed out, killing it to create a coredump 🗡️")
                 if self.connection.target_os != TargetOS.Windows:
-                    await self.connection.create_process(
-                        ["kill", "-11", str(self.kill_id)]
-                    ).execute()
+                    if self.kill_id:
+                        await self.connection.create_process(
+                            ["kill", "-11", str(self.kill_id)]
+                        ).execute()
+                    else:
+                        await self.connection.create_process(
+                            ["killall", "-11", "tcpdump"]
+                        ).execute()
                 raise TimeoutError from e
             yield self
             # Windump takes so long to flush packets to stdout/file