From 137d5928c475f1dfbb292ce70bc7a638d90d4ab8 Mon Sep 17 00:00:00 2001
From: Carlo Revelli <carlo.revelli@berkeley.edu>
Date: Fri, 3 Jul 2026 15:26:03 +0300
Subject: [PATCH] fix: run idle socket validation off setImmediate instead of
 setTimeout

---
 lib/dispatcher/client-h1.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/dispatcher/client-h1.js b/lib/dispatcher/client-h1.js
index 6d89dd09b5e..5ab9e6d699c 100644
--- a/lib/dispatcher/client-h1.js
+++ b/lib/dispatcher/client-h1.js
@@ -1050,7 +1050,7 @@ function onSocketClose () {
 
 function clearIdleSocketValidation (socket) {
   if (socket[kIdleSocketValidationTimeout]) {
-    clearTimeout(socket[kIdleSocketValidationTimeout])
+    clearImmediate(socket[kIdleSocketValidationTimeout])
     socket[kIdleSocketValidationTimeout] = null
   }
 
@@ -1059,14 +1059,14 @@ function clearIdleSocketValidation (socket) {
 
 function scheduleIdleSocketValidation (client, socket) {
   socket[kIdleSocketValidation] = 1
-  socket[kIdleSocketValidationTimeout] = setTimeout(() => {
+  socket[kIdleSocketValidationTimeout] = setImmediate(() => {
     socket[kIdleSocketValidationTimeout] = null
     socket[kIdleSocketValidation] = 2
 
     if (client[kSocket] === socket && !socket.destroyed) {
       client[kResume]()
     }
-  }, 0)
+  })
   socket[kIdleSocketValidationTimeout].unref?.()
 }