Date: Tue, 20 Nov 2018 09:30:26 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r340665 - user/pho/stress2/misc Message-ID: <201811200930.wAK9UQFM064166@repo.freebsd.org>
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Author: pho Date: Tue Nov 20 09:30:26 2018 New Revision: 340665 URL: https://svnweb.freebsd.org/changeset/base/340665 Log: Added a kevent(2) test. PR: 228858 Sponsored by: Dell EMC Isilon Added: user/pho/stress2/misc/kevent12.sh (contents, props changed) Added: user/pho/stress2/misc/kevent12.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/kevent12.sh Tue Nov 20 09:30:26 2018 (r340665) @@ -0,0 +1,234 @@ +#!/bin/sh + +# +# SPDX-License-Identifier: BSD-2-Clause-FreeBSD +# +# Copyright (c) 2018 Dell EMC Isilon +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# +# $FreeBSD$ +# + +# Bug 228858 - panic when delivering knote to a process who has opened a +# kqueue() is dying +# Page fault seen: https://people.freebsd.org/~pho/stress/log/mark052.txt + +# Test scenario based on analysis by siddharthtuli gmail com + +. ../default.cfg + +odir=`pwd` + +cd /tmp +sed '1,/^EOF/d' < $odir/$0 > kevent12.c +mycc -o kevent12 -Wall -Wextra -O2 -g kevent12.c || exit 1 +rm -f kevent12.c +cd $odir + +(cd $odir/../testcases/swap; ./swap -t 5m -i 20 -l 100 > /dev/null 2>&1) & +pid=$! +/tmp/kevent12 +while pgrep -q swap; do + pkill -9 swap +done +wait $pid + +rm -f /tmp/kevent12 +exit 0 +EOF +#include <sys/types.h> +#include <sys/event.h> +#include <sys/wait.h> + +#include <err.h> +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + +#define PARALLEL 64 +#define RUNTIME (5 * 60) + +static pid_t parent; +static int kq; + +static void +hand(int i __unused) { /* handler */ + kill(parent, SIGINT); + _exit(1); +} + +static void +init_kq() +{ + kq = kqueue(); + if (kq == -1) + err(1, "kqueue"); +} + +static void +add_watch(pid_t pid) +{ + struct kevent kev; + char msg[64]; + + bzero(&kev, sizeof(kev)); + kev.ident = pid; + kev.flags = EV_ADD | EV_ENABLE; + kev.filter = EVFILT_PROC; + kev.fflags = NOTE_EXIT | NOTE_EXEC | NOTE_TRACK | NOTE_TRACKERR; + + for (;;) { + int res = kevent(kq, &kev, 1, NULL, 0, NULL); + if (res == -1) { + if (errno == EINTR) + continue; + if (errno == ESRCH) + break; + + snprintf(msg, sizeof(msg), + "kevent - add watch for pid %u", pid); + err(1, "%s", msg); + } + else + break; + } +} + +static void +polling() +{ + struct kevent kev[10]; +#if defined(DEBUG) + pid_t pid; + int i; +#endif + + for (;;) { + bzero(&kev, sizeof(kev)); + if (arc4random() % 100 < 10) { + signal(SIGALRM, hand); + ualarm(10000, 0); + } + int res = kevent(kq, NULL, 0, kev, + sizeof(kev) / sizeof(kev[0]), NULL); + if (res == -1) { + if (errno == EINTR) + continue; + + if (errno == ESRCH) + continue; + + err(1, "kevent"); + } + +#if defined(DEBUG) + for (i = 0; i < res; i++) { + pid = kev[i].ident; + if (kev[i].fflags & NOTE_CHILD) { + add_watch(pid); + printf("%u - new process, parent %u\n", pid, + (unsigned int)kev[i].data); + } + if (kev[i].fflags & NOTE_FORK) { + printf("%u forked\n", pid); + } + if (kev[i].fflags & NOTE_EXEC) { + printf("%u called exec\n", pid); + } + if (kev[i].fflags & NOTE_EXIT) { + printf("%u exited\n", pid); + if (parent == pid) + return; + } + if (kev[i].fflags & NOTE_TRACK) { + printf("%u forked - track\n", pid); + } + if (kev[i].fflags & NOTE_TRACKERR) { + fprintf(stderr, "%u - track error\n", pid); + } + } +#endif + } +} + +void +churn(void) +{ + pid_t pid; + time_t start; + char *cmdline[] = { "/usr/bin/true", NULL }; + + start = time(NULL); + while (time(NULL) - start < RUNTIME) { + if ((pid = fork()) == -1) + err(1, "fork"); + if (pid == 0) { + if (execve(cmdline[0], cmdline, NULL) == -1) + err(1, "execve"); + } + if (waitpid(pid, NULL, 0) != pid) + err(1, "waitpid(%d):%d", pid, __LINE__); + } + + _exit(0); +} + +int +test(void) +{ + if ((parent = fork()) == 0) + churn(); + + init_kq(); + add_watch(parent); + polling(); + if (waitpid(parent, NULL, 0) != parent) + err(1, "waitpid(%d):%d", parent, __LINE__); + + _exit(0); +} + +int +main(void) +{ + pid_t pids[PARALLEL]; + time_t start; + int i; + + start = time(NULL); + while (time(NULL) - start < RUNTIME) { + for (i = 0; i < PARALLEL; i++) { + if ((pids[i] = fork()) == 0) + test(); + } + for (i = 0; i < PARALLEL; i++) + if (waitpid(pids[i], NULL, 0) != pids[i]) + err(1, "waitpid(%d):%d", pids[i], __LINE__); + } + + return (0); +}
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