Add test case for missing local task_work run

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/Makefile

@@ -67,6 +67,7 @@ test_srcs := \
 	d77a67ed5f27.c \
 	defer.c \
 	defer-taskrun.c \
+	defer-tw-timeout.c \
 	double-poll-crash.c \
 	drop-submit.c \
 	eeed8b54e0df.c \

test/defer-tw-timeout.c

@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: test waiting for more events than what will be posted with
+ *		a timeout with DEFER_TASKRUN. All kernels should time out,
+ *		but a non-buggy kernel will end up with one CQE available
+ *		for reaping. Buggy kernels will not have processed the
+ *		task_work and will have 0 events.
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "liburing.h"
+#include "helpers.h"
+
+struct d {
+	int fd;
+};
+
+static void *thread_fn(void *data)
+{
+	struct d *d = data;
+	int ret;
+
+	usleep(100000);
+	ret = write(d->fd, "Hello", 5);
+	if (ret < 0)
+		perror("write");
+	return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	struct io_uring ring;
+	struct __kernel_timespec ts;
+	int ret, fds[2], i;
+	pthread_t thread;
+	char buf[32];
+	struct d d;
+	void *tret;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	if (pipe(fds) < 0) {
+		perror("pipe");
+		return 1;
+	}
+	d.fd = fds[1];
+
+	ret = io_uring_queue_init(2, &ring, IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN);
+	if (ret == -EINVAL)
+		return T_EXIT_SKIP;
+
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_read(sqe, fds[0], buf, sizeof(buf), 0);
+
+	pthread_create(&thread, NULL, thread_fn, &d);
+
+	ts.tv_sec = 1;
+	ts.tv_nsec = 0;
+
+	ret = io_uring_submit_and_wait_timeout(&ring, &cqe, 2, &ts, NULL);
+	if (ret != 1) {
+		fprintf(stderr, "unexpected wait ret %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	for (i = 0; i < 2; i++) {
+		ret = io_uring_peek_cqe(&ring, &cqe);
+		if (ret)
+			break;
+		io_uring_cqe_seen(&ring, cqe);
+	}
+
+	if (i != 1) {
+		fprintf(stderr, "Got %d request, expected 1\n", i);
+		return T_EXIT_FAIL;
+	}
+
+	pthread_join(thread, &tret);
+	return T_EXIT_PASS;
+}