From 1ad719ff19b385ade87ca8d5c0cd48df6873ef6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kacper=20Michaj=C5=82ow?= <kasper93@gmail.com>
Date: Mon, 8 Jun 2026 01:20:56 +0200
Subject: [PATCH] osdep/subprocess-posix: restore signal mask on detached fork
 failure

---
 osdep/subprocess-posix.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/osdep/subprocess-posix.c b/osdep/subprocess-posix.c
index d583ab07d0..3e9d15120c 100644
--- a/osdep/subprocess-posix.c
+++ b/osdep/subprocess-posix.c
@@ -224,8 +224,10 @@ void mp_subprocess2(struct mp_subprocess_opts *opts,
         sigfillset(&sigmask);
         pthread_sigmask(SIG_BLOCK, &sigmask, &oldmask);
         pid_t fres = fork();
-        if (fres < 0)
+        if (fres < 0) {
+            pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
             goto done;
+        }
         if (fres == 0) {
             // child
             setsid();