Use atomic load to read interrupt mask

1 files changed, 2 insertions, 1 deletions

diff --git a/thread.c b/thread.c
index 0494524510..dcd5a64f6b 100644
--- a/thread.c
+++ b/thread.c
@@ -2465,8 +2465,9 @@ threadptr_get_interrupts(rb_thread_t *th)
     rb_atomic_t interrupt;
     rb_atomic_t old;
 
+    old = ATOMIC_LOAD_RELAXED(ec->interrupt_flag);
     do {
-        interrupt = ec->interrupt_flag;
+        interrupt = old;
         old = ATOMIC_CAS(ec->interrupt_flag, interrupt, interrupt & ec->interrupt_mask);
     } while (old != interrupt);
     return interrupt & (rb_atomic_t)~ec->interrupt_mask;