[PATCH] test: poll cancellation with offset timeouts

[Pavel Begunkov <asml.silence@gmail.com>]

Test for a recent locking problem during poll cancellation with
offset timeouts queued.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 test/poll-cancel.c | 101 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 97 insertions(+), 4 deletions(-)

diff --git a/test/poll-cancel.c b/test/poll-cancel.c
index a74e915..408159d 100644
--- a/test/poll-cancel.c
+++ b/test/poll-cancel.c
@@ -26,7 +26,7 @@ static void sig_alrm(int sig)
 	exit(1);
 }
 
-int main(int argc, char *argv[])
+static int test_poll_cancel(void)
 {
 	struct io_uring ring;
 	int pipe1[2];
@@ -36,9 +36,6 @@ int main(int argc, char *argv[])
 	struct sigaction act;
 	int ret;
 
-	if (argc > 1)
-		return 0;
-
 	if (pipe(pipe1) != 0) {
 		perror("pipe");
 		return 1;
@@ -130,6 +127,102 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
+	close(pipe1[0]);
+	close(pipe1[1]);
 	io_uring_cqe_seen(&ring, cqe);
+	io_uring_queue_exit(&ring);
+	return 0;
+}
+
+
+static int __test_poll_cancel_with_timeouts(void)
+{
+	struct __kernel_timespec ts = { .tv_sec = 10, };
+	struct io_uring ring, ring2;
+	struct io_uring_sqe *sqe;
+	int ret, off_nr = 1000;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return 1;
+	}
+
+	ret = io_uring_queue_init(1, &ring2, 0);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return 1;
+	}
+
+	/* test timeout-offset triggering path during cancellation */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_timeout(sqe, &ts, off_nr, 0);
+
+	/* poll ring2 to trigger cancellation on exit() */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_poll_add(sqe, ring2.ring_fd, POLLIN);
+	sqe->flags |= IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_link_timeout(sqe, &ts, 0);
+
+	ret = io_uring_submit(&ring);
+	if (ret != 3) {
+		fprintf(stderr, "sqe submit failed\n");
+		return 1;
+	}
+
+	/* just drop all rings/etc. intact, exit() will clean them up */
+	return 0;
+}
+
+static int test_poll_cancel_with_timeouts(void)
+{
+	int ret;
+	pid_t p;
+
+	p = fork();
+	if (p == -1) {
+		fprintf(stderr, "fork() failed\n");
+		return 1;
+	}
+
+	if (p == 0) {
+		ret = __test_poll_cancel_with_timeouts();
+		exit(ret);
+	} else {
+		int wstatus;
+
+		if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
+			perror("waitpid()");
+			return 1;
+		}
+		if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus)) {
+			fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
+			return 1;
+		}
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	if (argc > 1)
+		return 0;
+
+	ret = test_poll_cancel();
+	if (ret) {
+		fprintf(stderr, "test_poll_cancel failed\n");
+		return -1;
+	}
+
+	ret = test_poll_cancel_with_timeouts();
+	if (ret) {
+		fprintf(stderr, "test_poll_cancel_with_timeouts failed\n");
+		return -1;
+	}
+
 	return 0;
 }
-- 
2.34.0