diff --git a/serve/server.py b/serve/server.py
index 768f6bcc374..72b81495550 100644
--- a/serve/server.py
+++ b/serve/server.py
@@ -3435,6 +3435,12 @@ def gpu_speed_scores(indices: list[int]) -> dict[int, float] | None:
     return got if all(i in got and got[i] > 0 for i in indices) else None
 
 
+
+def _read_lines(path: str):
+    """The lines of `path`, with the file closed when the caller is done (the HIP properties probe reads two)."""
+    with open(path) as fh:
+        return fh.readlines()
+
 def hip_speed_scores(indices: list[int], root: str = "/sys/class/kfd/kfd/topology/nodes") -> dict[int, float] | None:
     """AMD on Linux: SIMDs x max engine clock of each card, from the KFD topology (the order setup and the engine use
     for "gpu" there: the GPU nodes in node order).  None when the files are not there (Windows, no ROCm driver)."""
@@ -3445,7 +3451,7 @@ def hip_speed_scores(indices: list[int], root: str = "/sys/class/kfd/kfd/topolog
     cards = []
     for n in nodes:
         try:
-            props = dict(line.split() for line in open(os.path.join(root, str(n), "properties")) if len(line.split()) == 2)
+            props = dict(line.split() for line in _read_lines(os.path.join(root, str(n), "properties")) if len(line.split()) == 2)
             simd, clk = int(props.get("simd_count", 0)), int(props.get("max_engine_clk_fcompute", 0))
         except (OSError, ValueError):
             continue
@@ -3482,7 +3488,7 @@ def hip_gpu_archs(root: str = "/sys/class/kfd/kfd/topology/nodes") -> dict[int,
     out: dict[int, str] = {}
     for n in nodes:
         try:
-            props = dict(line.split() for line in open(os.path.join(root, str(n), "properties")) if len(line.split()) == 2)
+            props = dict(line.split() for line in _read_lines(os.path.join(root, str(n), "properties")) if len(line.split()) == 2)
             ver, simd = int(props.get("gfx_target_version", 0)), int(props.get("simd_count", 0))
         except (OSError, ValueError):
             continue
diff --git a/serve/telemetry.py b/serve/telemetry.py
index f56da0907f0..8722f62fa5f 100644
--- a/serve/telemetry.py
+++ b/serve/telemetry.py
@@ -455,7 +455,8 @@ def _cpu_topology(root: str = "/sys/devices/system"):
         packages = set()
         for f in glob.glob(os.path.join(root, "cpu", "cpu[0-9]*", "topology", "physical_package_id")):
             try:
-                packages.add(open(f, encoding="utf-8").read().strip())
+                with open(f, encoding="utf-8") as fh:
+                    packages.add(fh.read().strip())
             except OSError:
                 continue
         nodes = len(glob.glob(os.path.join(root, "node", "node[0-9]*")))
@@ -473,9 +474,10 @@ def _cpu_name():
         except OSError:
             pass
     elif os.path.exists("/proc/cpuinfo"):
-        for line in open("/proc/cpuinfo", encoding="utf-8", errors="replace"):
-            if line.startswith("model name"):
-                return line.split(":", 1)[1].strip()
+        with open("/proc/cpuinfo", encoding="utf-8", errors="replace") as fh:
+            for line in fh:
+                if line.startswith("model name"):
+                    return line.split(":", 1)[1].strip()
     return platform.processor() or None
 
 
@@ -492,7 +494,8 @@ def _times(self):
                 return idle.value, kern.value + user.value           # kernel time includes idle
             return None
         try:
-            f = [int(x) for x in open("/proc/stat").readline().split()[1:]]
+            with open("/proc/stat") as fh:
+                f = [int(x) for x in fh.readline().split()[1:]]
             return f[3] + f[4], sum(f)
         except (OSError, ValueError):
             return None
@@ -519,7 +522,8 @@ class MS(ctypes.Structure):
                 return m.ullTotalPhys - m.ullAvailPhys, m.ullTotalPhys
             return None, None
         try:
-            info = dict(line.split(":", 1) for line in open("/proc/meminfo"))
+            with open("/proc/meminfo") as fh:
+                info = dict(line.split(":", 1) for line in fh)
             total = int(info["MemTotal"].split()[0]) * 1024
             avail = int(info["MemAvailable"].split()[0]) * 1024
             return total - avail, total