From d91d8c98f825b1d51837bb44f632a075fec32e0d Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Tue, 10 Feb 2026 17:09:56 +0200
Subject: [PATCH] * src/process.c (server_accept_connection): Fix assertion
 (bug#80237).

---
 src/process.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/process.c b/src/process.c
index ac29d403c6f..d40500cc050 100644
--- a/src/process.c
+++ b/src/process.c
@@ -5137,11 +5137,15 @@ server_accept_connection (Lisp_Object server, int channel)
   /* If the server process is locked to this thread, lock the client
      process to the same thread, otherwise clear the thread of its I/O
      descriptors.  */
-  eassert (!fd_callback_info[p->infd].thread);
   if (NILP (ps->thread))
-    set_proc_thread (p, NULL);
+    {
+      eassert (!fd_callback_info[p->infd].thread);
+      set_proc_thread (p, NULL);
+    }
   else
     {
+      eassert (!fd_callback_info[p->infd].thread
+	       || fd_callback_info[p->infd].thread == XTHREAD (ps->thread));
       eassert (XTHREAD (ps->thread) == current_thread);
       set_proc_thread (p, XTHREAD (ps->thread));
     }