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