155 lines
3.9 KiB
Bash
Executable File
155 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2014 EMC Corp.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# The issue makes it possible for applications to get wrong EINTR
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# or ERESTART (the later is not directly visible) when doing write
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# to the file on suspended UFS volume. I.e. the thread is sleeping
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# when fs is suspended, and process is signaled.
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# Test scenario mostly by kib.
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# Fixed in r275744.
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# Deadlock seen:
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# https://people.freebsd.org/~pho/stress/log/pcatch.txt
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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[ -z "$DEBUG" ] && exit 0 # Waiting for fix
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. ../default.cfg
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > pcatch.c
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mycc -o pcatch -Wall -Wextra -O0 -g pcatch.c || exit 1
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rm -f pcatch.c
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cd $here
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mount | grep -q "$mntpoint" && umount $mntpoint
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mdconfig -l | grep -q $mdstart && mdconfig -d -u $mdstart
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mdconfig -a -t swap -s 1g -u $mdstart
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bsdlabel -w md$mdstart auto
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newfs $newfs_flags md${mdstart}$part > /dev/null
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mount /dev/md${mdstart}$part $mntpoint
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start=`date '+%s'`
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while [ $((`date '+%s'` - start)) -lt 120 ]; do
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/tmp/pcatch $mntpoint
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done
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while mount | grep -q "on $mntpoint "; do
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umount $mntpoint || sleep 1
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done
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mdconfig -d -u $mdstart
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rm -f /tmp/pcatch
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exit 0
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EOF
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/wait.h>
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#include <ufs/ffs/fs.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void
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hand_sigaction(int signo __unused, siginfo_t *si __unused, void *c __unused)
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{
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}
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static void
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suspend(char *path)
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{
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struct statfs s;
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int fd, error;
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if (fork() == 0) {
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if ((error = statfs(path, &s)) != 0)
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err(1, "statfs %s", path);
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fd = open("/dev/ufssuspend", O_RDWR);
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if ((error = ioctl(fd, UFSSUSPEND, &s.f_fsid)) != 0)
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err(1, "UFSSUSPEND");
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sleep(1);
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if ((error = ioctl(fd, UFSRESUME, &s.f_fsid)) != 0)
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err(1, "UFSRESUME");
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_exit(0);
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}
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}
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static void
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test(char *mp)
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{
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pid_t pid;
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struct sigaction sa;
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int fd;
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char buf[80], file[80];
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = hand_sigaction;
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if (sigaction(SIGUSR1, &sa, NULL) == -1)
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err(1, "sigaction");
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snprintf(file, sizeof(file), "%s/file", mp);
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if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0640)) == -1)
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err(1, "open(%s). %s:%d", file, __FILE__, __LINE__);
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suspend(mp);
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if ((pid = fork()) == 0) {
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if (write(fd, buf, sizeof(buf)) == -1)
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warn("FAIL: write");
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_exit(0);
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}
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usleep(10000);
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if (kill(pid, SIGUSR1) == -1)
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err(1, "kill");
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wait(NULL);
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wait(NULL);
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close(fd);
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}
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int
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main(int argc, char *argv[])
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{
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if (argc != 2)
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errx(1, "Usage: %s <UFS mount point>", argv[0]);
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test(argv[1]);
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return (0);
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}
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