inotify07: Add test for kernel crash during event notification

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+/*
+ * Copyright (c) 2015 SUSE Linux.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * Started by Jan Kara <[email protected]>
+ *
+ * DESCRIPTION
+ * Test for inotify mark connector destruction race.
+ *
+ * Kernels prior to 4.17 have a race when the last fsnotify mark on the inode
+ * is being deleted while another process reports event happening on that
+ * inode. When the race is hit, the kernel crashes or loops.
+ *
+ * The problem has been fixed by commit:
+ * d90a10e2444b "fsnotify: Fix fsnotify_mark_connector race"
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <time.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/syscall.h>
+
+#include "tst_test.h"
+#include "inotify.h"
+
+#if defined(HAVE_SYS_INOTIFY_H)
+#include <sys/inotify.h>
+
+/* Number of test loops to run the test for */
+#define TEARDOWNS 1000000
+
+static void verify_inotify(void)
+{
+	int inotify_fd, fd;
+	int wd;
+	pid_t pid;
+	int tests;
+	char *name = "stress_fname";
+
+	fd = SAFE_OPEN(name, O_CREAT | O_RDWR, 0600);
+	pid = SAFE_FORK();
+	if (pid == 0) {
+		char buf[64];
+
+		memset(buf, 'a', sizeof(buf));
+		while (1) {
+			SAFE_WRITE(0, fd, buf, sizeof(buf));
+			SAFE_LSEEK(fd, 0, SEEK_SET);
+		}
+		/* Never reached */
+	}
+	SAFE_CLOSE(fd);
+
+	inotify_fd = myinotify_init1(0);
+	if (inotify_fd < 0)
+		tst_brk(TBROK | TERRNO, "inotify_init failed");
+	for (tests = 0; tests < TEARDOWNS; tests++) {
+		wd = myinotify_add_watch(inotify_fd, name, IN_MODIFY);
+		if (wd < 0)
+			tst_brk(TBROK | TERRNO, "inotify_add_watch() failed.");
+		wd = myinotify_rm_watch(inotify_fd, wd);
+		if (wd < 0)
+			tst_brk(TBROK | TERRNO, "inotify_rm_watch() failed.");
+	}
+	SAFE_CLOSE(inotify_fd);
+	/* We survived for given time - test succeeded */
+	tst_res(TPASS, "kernel survived inotify beating");
+
+	/* Kill the child writing to file and wait for it */
+	SAFE_KILL(pid, SIGKILL);
+	SAFE_WAIT(NULL);
+}
+
+static struct tst_test test = {
+	.timeout = 600,
+	.needs_tmpdir = 1,
+	.forks_child = 1,
+	.test_all = verify_inotify,
+};
+
+#else
+	TST_TEST_TCONF("system doesn't have required inotify support");
+#endif