Allow wakeup mutex to be used in trap context. (#13684)

1 files changed, 1 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 5575157728..0f1a1d6b8b 100644
--- a/thread.c
+++ b/thread.c
@@ -2847,6 +2847,7 @@ rb_thread_io_close_interrupt(struct rb_io *io)
 
     // This is used to ensure the correct execution context is woken up after the blocking operation is interrupted:
     io->wakeup_mutex = rb_mutex_new();
+    rb_mutex_allow_trap(io->wakeup_mutex, 1);
 
     // We need to use a mutex here as entering the fiber scheduler may cause a context switch:
     VALUE result = rb_mutex_synchronize(io->wakeup_mutex, thread_io_close_notify_all, (VALUE)io);