106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2018 SUSE Linux. All Rights Reserved.
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* Author: Jan Kara <jack@suse.cz>
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* Chnaged to use fzsync library by Cyril Hrubis <chrubis@suse.cz>
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*
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* DESCRIPTION
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* Test for inotify mark connector destruction race.
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*
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* Kernels prior to 4.17 have a race when the last fsnotify mark on the inode
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* is being deleted while another process reports event happening on that
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* inode. When the race is hit, the kernel crashes or loops.
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*
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* The problem has been fixed by commit:
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* d90a10e2444b "fsnotify: Fix fsnotify_mark_connector race"
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*/
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <time.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/syscall.h>
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#include "tst_test.h"
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#include "tst_safe_pthread.h"
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#include "tst_fuzzy_sync.h"
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#include "inotify.h"
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#define FNAME "stress_fname"
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#if defined(HAVE_SYS_INOTIFY_H)
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#include <sys/inotify.h>
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static struct tst_fzsync_pair fzsync_pair;
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static int fd;
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static void *write_seek(void *unused)
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{
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char buf[64];
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while (tst_fzsync_run_b(&fzsync_pair)) {
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tst_fzsync_start_race_b(&fzsync_pair);
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SAFE_WRITE(0, fd, buf, sizeof(buf));
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SAFE_LSEEK(fd, 0, SEEK_SET);
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tst_fzsync_end_race_b(&fzsync_pair);
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}
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return unused;
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}
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static void setup(void)
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{
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fd = SAFE_OPEN(FNAME, O_CREAT | O_RDWR, 0600);
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tst_fzsync_pair_init(&fzsync_pair);
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}
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static void cleanup(void)
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{
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if (fd > 0)
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SAFE_CLOSE(fd);
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tst_fzsync_pair_cleanup(&fzsync_pair);
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}
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static void verify_inotify(void)
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{
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int inotify_fd;
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int wd;
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inotify_fd = SAFE_MYINOTIFY_INIT1(0);
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tst_fzsync_pair_reset(&fzsync_pair, write_seek);
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while (tst_fzsync_run_a(&fzsync_pair)) {
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wd = SAFE_MYINOTIFY_ADD_WATCH(inotify_fd, FNAME, IN_MODIFY);
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tst_fzsync_start_race_a(&fzsync_pair);
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wd = myinotify_rm_watch(inotify_fd, wd);
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tst_fzsync_end_race_a(&fzsync_pair);
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if (wd < 0)
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tst_brk(TBROK | TERRNO, "inotify_rm_watch() failed.");
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}
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SAFE_CLOSE(inotify_fd);
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/* We survived for given time - test succeeded */
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tst_res(TPASS, "kernel survived inotify beating");
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_inotify,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "d90a10e2444b"},
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{}
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}
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};
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#else
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TST_TEST_TCONF("system doesn't have required inotify support");
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#endif
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