110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <setjmp.h>
|
|
#include <signal.h>
|
|
|
|
#include "vm_util.h"
|
|
#include "../kselftest.h"
|
|
|
|
#define INLOOP_ITER 100
|
|
|
|
static char *huge_ptr;
|
|
static size_t huge_page_size;
|
|
|
|
static sigjmp_buf sigbuf;
|
|
static bool sigbus_triggered;
|
|
|
|
static void signal_handler(int signal)
|
|
{
|
|
if (signal == SIGBUS) {
|
|
sigbus_triggered = true;
|
|
siglongjmp(sigbuf, 1);
|
|
}
|
|
}
|
|
|
|
/* Touch the memory while it is being madvised() */
|
|
void *touch(void *unused)
|
|
{
|
|
char *ptr = (char *)huge_ptr;
|
|
|
|
if (sigsetjmp(sigbuf, 1))
|
|
return NULL;
|
|
|
|
for (int i = 0; i < INLOOP_ITER; i++)
|
|
ptr[0] = '.';
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void *madv(void *unused)
|
|
{
|
|
usleep(rand() % 10);
|
|
|
|
for (int i = 0; i < INLOOP_ITER; i++)
|
|
madvise(huge_ptr, huge_page_size, MADV_DONTNEED);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
unsigned long free_hugepages;
|
|
pthread_t thread1, thread2;
|
|
/*
|
|
* On kernel 6.4, we are able to reproduce the problem with ~1000
|
|
* interactions
|
|
*/
|
|
int max = 10000;
|
|
int err;
|
|
|
|
ksft_print_header();
|
|
ksft_set_plan(1);
|
|
|
|
srand(getpid());
|
|
|
|
if (signal(SIGBUS, signal_handler) == SIG_ERR)
|
|
ksft_exit_skip("Could not register signal handler.");
|
|
|
|
huge_page_size = default_huge_page_size();
|
|
if (!huge_page_size)
|
|
ksft_exit_skip("Could not detect default hugetlb page size.");
|
|
|
|
ksft_print_msg("[INFO] detected default hugetlb page size: %zu KiB\n",
|
|
huge_page_size / 1024);
|
|
|
|
free_hugepages = get_free_hugepages();
|
|
if (free_hugepages != 1) {
|
|
ksft_exit_skip("This test needs one and only one page to execute. Got %lu\n",
|
|
free_hugepages);
|
|
}
|
|
|
|
while (max--) {
|
|
huge_ptr = mmap(NULL, huge_page_size, PROT_READ | PROT_WRITE,
|
|
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
|
|
-1, 0);
|
|
|
|
if ((unsigned long)huge_ptr == -1)
|
|
ksft_exit_skip("Failed to allocated huge page\n");
|
|
|
|
pthread_create(&thread1, NULL, madv, NULL);
|
|
pthread_create(&thread2, NULL, touch, NULL);
|
|
|
|
pthread_join(thread1, NULL);
|
|
pthread_join(thread2, NULL);
|
|
munmap(huge_ptr, huge_page_size);
|
|
}
|
|
|
|
ksft_test_result(!sigbus_triggered, "SIGBUS behavior\n");
|
|
|
|
err = ksft_get_fail_cnt();
|
|
if (err)
|
|
ksft_exit_fail_msg("%d out of %d tests failed\n",
|
|
err, ksft_test_num());
|
|
ksft_exit_pass();
|
|
}
|