From c184ca2c68abfc6864c7fc64d7b3c3e657afd7a8 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Tue, 18 Aug 2026 17:50:28 +0200
Subject: [PATCH] fix(lifecycle): ignore signals during os_exit

Problem:
SIGTERM received during `os_exit()` can cause it to "nest":

    os_exit src/nvim/main.c:720
    preserve_exit src/nvim/main.c:910
    deadly_signal src/nvim/os/signal.c:205
    on_signal src/nvim/os/signal.c:240
    signal_event src/nvim/event/signal.c:45
    multiqueue_process_events src/nvim/event/multiqueue.c:159
    event_teardown src/nvim/main.c:178
    os_exit src/nvim/main.c:720

Solution:
Call `signal_reject_deadly()` at the start of `os_exit()` like
`preserve_exit()` already does.
---
 src/nvim/main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/nvim/main.c b/src/nvim/main.c
index 467d9ddb54..b87f32fb90 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -706,6 +706,8 @@ void os_exit(int r)
   FUNC_ATTR_NORETURN
 {
   exiting = true;
+  // Avoid recursion in case SIGTERM arrives during `os_exit`.
+  signal_reject_deadly();
 
   if (ui_client_channel_id) {
     ui_client_stop();