diff --git a/tests/integration/providers/test_cache_control_tool_call_marks_owned_proxy.py b/tests/integration/providers/test_cache_control_tool_call_marks_owned_proxy.py
index 46d6e9a40cb..2d8a50a2d33 100644
--- a/tests/integration/providers/test_cache_control_tool_call_marks_owned_proxy.py
+++ b/tests/integration/providers/test_cache_control_tool_call_marks_owned_proxy.py
@@ -1,20 +1,21 @@
 import asyncio
+import os
 import re
 import signal
 import socket
+import threading
 from collections import Counter
-from collections.abc import Sequence
+from collections.abc import Callable, Sequence
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Final
 
 import httpx
-import psutil
 import pytest
 from integration._support.client import Gateway, eventually
 from integration._support.database import read_rows
 from integration._support.process import owned_proxy_process
-from integration._support.wire import Request, wire_server
+from integration._support.wire import Reply, Request, wire_server
 from integration.providers._cache_control_marks_support import (
     ASK_LABEL,
     CITIES,
@@ -52,7 +53,6 @@ class _Sent:
     status: int
     text: str
     call_id: str
-    client_port: int
 
 
 def _free_port() -> int:
@@ -87,16 +87,9 @@ async def _fire(owned_url: str, key: str, *, tolerate_transport_errors: bool = F
         surface: Final = _SURFACES[index % len(_SURFACES)]
         marker: Final = new_marker()
         path, body = _surface_request(surface, marker)
-        async with client.stream("POST", path, json=body, headers={"Authorization": f"Bearer {key}"}) as response:
-            client_port: Final = int(response.extensions["network_stream"].get_extra_info("client_addr")[1])
-            await response.aread()
+        response: Final = await client.post(path, json=body, headers={"Authorization": f"Bearer {key}"})
         return _Sent(
-            surface,
-            marker,
-            response.status_code,
-            response.text,
-            response.headers.get("x-litellm-call-id", ""),
-            client_port,
+            surface, marker, response.status_code, response.text, response.headers.get("x-litellm-call-id", "")
         )
 
     async with httpx.AsyncClient(base_url=owned_url, timeout=30, trust_env=False) as client:
@@ -108,6 +101,14 @@ async def _fire(owned_url: str, key: str, *, tolerate_transport_errors: bool = F
     return tuple(result for result in results if isinstance(result, _Sent))
 
 
+def _held_anthropic_peer(release: threading.Event) -> Callable[[Request], Reply]:
+    def respond(request: Request) -> Reply:
+        assert release.wait(timeout=120), "Held upstream was never released"
+        return anthropic_peer(request)
+
+    return respond
+
+
 def _by_marker(received: Sequence[Request]) -> dict[str, tuple[Request, ...]]:
     counted: Final = Counter(marker_of(request) for request in received)
     return {marker: tuple(request for request in received if marker_of(request) == marker) for marker in counted}
@@ -176,7 +177,8 @@ async def test_capped_burst_rides_out_a_provider_outage_and_logs_every_request_o
 async def test_worker_sigkill_mid_burst_leaves_the_sibling_serving_capped_requests(
     gateway: Gateway, tmp_path: Path
 ) -> None:
-    with wire_server(anthropic_peer) as wire:
+    release: Final = threading.Event()
+    with wire_server(_held_anthropic_peer(release)) as wire:
         config: Final = owned_config(
             tmp_path, [anthropic_deployment(_MODEL, wire.url, cache_control_injection_points=POINTS)]
         )
@@ -188,26 +190,21 @@ async def test_worker_sigkill_mid_burst_leaves_the_sibling_serving_capped_reques
             )
             owned_url: Final = str(owned.gateway.client.base_url)
             burst: Final = asyncio.create_task(_fire(owned_url, owned.gateway.key, tolerate_transport_errors=True))
-            await asyncio.to_thread(eventually, lambda: wire.received.qsize(), lambda size: size >= 5, 30)
-            victim: Final = psutil.Process(workers[0])
-            victim.suspend()
-            victim_ports: Final = frozenset(
-                connection.raddr.port for connection in victim.net_connections(kind="tcp") if connection.raddr
-            )
-            victim.send_signal(signal.SIGKILL)
+            try:
+                await asyncio.to_thread(eventually, lambda: wire.received.qsize(), lambda size: size >= _BURST, 20)
+                os.kill(workers[0], signal.SIGKILL)
+            finally:
+                release.set()
             served: Final = await burst
             during: Final = wire.drain()
             after: Final = await _fire(owned_url, owned.gateway.key)
             after_received: Final = wire.drain()
+    assert 0 < len(served) < _BURST, len(served)
     assert all(len(requests) == 1 for requests in _by_marker(during).values())
-    _assert_capped(tuple(item for item in served if item.status == 200), during)
+    _assert_capped(served, during)
     _assert_capped(after, after_received)
-    survivors: Final = tuple(item for item in served if item.client_port not in victim_ports)
-    assert survivors, [item.client_port for item in served]
-    for item in (*survivors, *after):
+    for item in (*served, *after):
         _single_spend_row(item)
-    for item in served:
-        assert len(_spend_rows(item.call_id)) <= 1, item.call_id
 
 
 @pytest.mark.timeout(240)