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/* SPDX-License-Identifier: MIT */
/*
* Regression test for incorrect async_list io_should_merge() logic
* Bug was fixed in 5.5 by (commit: 561fb04 io_uring: replace workqueue usage with io-wq")
* Affects 5.4 lts branch, at least 5.4.106 is affected.
*/
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include "liburing.h"
#include "helpers.h"
int main(int argc, char *argv[])
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
int ret, fd, pipe1[2];
char buf[4096];
struct iovec vec = {
.iov_base = buf,
.iov_len = sizeof(buf)
};
struct __kernel_timespec ts = {.tv_sec = 3, .tv_nsec = 0};
if (argc > 1)
return 0;
ret = pipe(pipe1);
assert(!ret);
fd = open("testfile", O_RDWR | O_CREAT, 0644);
assert(fd >= 0);
unlink("testfile");
ret = ftruncate(fd, 4096);
assert(!ret);
ret = t_create_ring(4, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret < 0)
return 1;
/* REQ1 */
sqe = io_uring_get_sqe(&ring);
io_uring_prep_readv(sqe, pipe1[0], &vec, 1, 0);
sqe->user_data = 1;
/* REQ2 */
sqe = io_uring_get_sqe(&ring);
io_uring_prep_readv(sqe, fd, &vec, 1, 4096);
sqe->user_data = 2;
ret = io_uring_submit(&ring);
assert(ret == 2);
ret = io_uring_wait_cqe(&ring, &cqe);
assert(!ret);
assert(cqe->res == 0);
assert(cqe->user_data == 2);
io_uring_cqe_seen(&ring, cqe);
/*
* REQ3
* Prepare request adjacent to previous one, so merge logic may want to
* link it to previous request, but because of a bug in merge logic
* it may be merged with <REQ1> request
*/
sqe = io_uring_get_sqe(&ring);
io_uring_prep_readv(sqe, fd, &vec, 1, 2048);
sqe->user_data = 3;
ret = io_uring_submit(&ring);
assert(ret == 1);
/*
* Read may stuck because of bug there request was be incorrecly
* merged with <REQ1> request
*/
ret = io_uring_wait_cqe_timeout(&ring, &cqe, &ts);
if (ret == -ETIME) {
printf("TEST_FAIL: readv req3 stuck\n");
return 1;
}
assert(!ret);
assert(cqe->res == 2048);
assert(cqe->user_data == 3);
io_uring_cqe_seen(&ring, cqe);
io_uring_queue_exit(&ring);
return 0;
}
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