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/*
* Check for the corner case that previously lead to segfault
* due to an attempt to access uninitialised tcp->s_ent.
*
* 13994 ???( <unfinished ...>
* ...
* 13994 <... ??? resumed>) = ?
*
* Copyright (c) 2019-2025 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <sched.h>
#include <signal.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
#define ITERS 10000
#define SC_ITERS 10000
int
main(void)
{
volatile sig_atomic_t *const mem =
mmap(NULL, get_page_size(), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (mem == MAP_FAILED)
perror_msg_and_fail("mmap");
for (unsigned int i = 0; i < ITERS; ++i) {
mem[0] = mem[1] = 0;
const pid_t pid = fork();
if (pid < 0)
perror_msg_and_fail("fork");
if (!pid) {
/* wait for the parent */
while (!mem[0])
;
/* let the parent know we are running */
mem[1] = 1;
for (unsigned int j = 0; j < SC_ITERS; j++)
sched_yield();
pause();
return 0;
}
/* let the child know we are running */
mem[0] = 1;
/* wait for the child */
while (!mem[1])
;
if (kill(pid, SIGKILL))
perror_msg_and_fail("kill");
if (wait(NULL) != pid)
perror_msg_and_fail("wait");
}
return 0;
}
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