fixup! libmpathutil: avoid segmentation violation in pthread_cancel()

Author: mwilck

libmpathutil/runner.c

@@ -132,7 +132,8 @@ static int cancel_runner(struct runner_context *rctx)
 		break;
 	case RUNNER_RUNNING:
 		pthread_cancel(rctx->thr);
-		uatomic_set(&rctx->status, RUNNER_DEAD);
+		assert(uatomic_cmpxchg(&rctx->status, RUNNER_CANCELLED,
+				       RUNNER_DEAD) == RUNNER_CANCELLED);
 		st_new = RUNNER_CANCELLED;
 		/* fallthrough */
 	case RUNNER_CANCELLED: