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/* SPDX-License-Identifier: MIT */
/*
* Description: trigger segfault. A recent 6.4-rc kernel introduced a bug
* via vhost where segfaults for applications using io_uring
* would hang in D state forever upon trying to generate the
* core file. Perform a trivial test where a child process
* generates a NULL pointer dereference and ensure that we don't
* hang.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include "liburing.h"
#include "helpers.h"
static void test(void)
{
struct io_uring_sqe *sqe;
struct io_uring ring;
int *ptr = NULL;
int fds[2];
char r1;
if (pipe(fds) < 0) {
perror("pipe");
exit(0);
}
io_uring_queue_init(8, &ring, 0);
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[0], &r1, sizeof(r1), 0);
sqe->flags = IOSQE_ASYNC;
sqe->user_data = 1;
io_uring_submit(&ring);
*ptr = 0;
exit(0);
}
int main(int argc, char *argv[])
{
pid_t pid;
int wstat;
pid = fork();
if (pid < 0) {
perror("fork");
return T_EXIT_SKIP;
} else if (!pid) {
test();
}
wait(&wstat);
return T_EXIT_PASS;
}
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