Update

Author: corona10

Modules/_randommodule.c

@@ -154,11 +154,13 @@ genrand_uint32(RandomObject *self)
         }
         y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
         mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1U];
-
-        FT_ATOMIC_STORE_INT(self->index, 0);
+        index = 0;
+#ifdef Py_GIL_DISABLED
+        FT_ATOMIC_STORE_INT(self->index, index);
+#endif
     }
-
-    y = mt[FT_ATMOIC_INT_INCREMENT(self->index)];
+    y = mt[index];
+    FT_ATMOIC_INT_INCREMENT(self->index);
     y ^= (y >> 11);
     y ^= (y << 7) & 0x9d2c5680U;
     y ^= (y << 15) & 0xefc60000U;