Index: user/pho/stress2/misc/fdatasync.sh
===================================================================
--- user/pho/stress2/misc/fdatasync.sh	(revision 364803)
+++ user/pho/stress2/misc/fdatasync.sh	(revision 364804)
@@ -1,202 +1,199 @@
 #!/bin/sh
 
 #
 # Copyright (c) 2018 Dell EMC Isilon
 # All rights reserved.
 #
 # 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.
 #
 # $FreeBSD$
 #
 
 # fdatasync(2) fuzz.
 
 # Deadlock seen:
 # https://people.freebsd.org/~pho/stress/log/fdatasync.txt
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 . ../default.cfg
 
 dir=$RUNDIR
 nfiles=500
 [ `df -i $dir | tail -1 | awk '{print $7}'` -lt $nfiles ] && exit 0
 
 odir=`pwd`
 cd /tmp
 sed '1,/^EOF/d' < $odir/$0 > fdatasync.c
 rm -f /tmp/fdatasync
 mycc -o fdatasync -Wall -Wextra -O2 -g fdatasync.c -lpthread || exit 1
 rm -f fdatasync.c
 
 mkdir -p $dir && chmod 777 $dir
 
 cd $dir
 jot $nfiles | xargs touch
 jot $nfiles | xargs chmod 666
 cd $odir
 
 (cd /tmp; /tmp/fdatasync $dir)
 e=$?
 
 rm -rf $dir/* /tmp/fdatasync
 exit $e
 EOF
 #include <sys/param.h>
 #include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
 
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fts.h>
 #include <libutil.h>
 #include <pthread.h>
 #include <pwd.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #define N (128 * 1024 / (int)sizeof(u_int32_t))
 #define RUNTIME 180
 #define THREADS 2
 
 static int fd[900];
 static u_int32_t r[N];
 static char *args[2];
 
 static unsigned long
 makearg(void)
 {
 	unsigned long val;
 
 	val = arc4random();
 #if defined(__LP64__)
 	val = (val << 32) | arc4random();
 	val = val & 0x00007fffffffffffUL;
 #endif
 
 	return(val);
 }
 
 static void *
 test(void *arg __unused)
 {
 	FTS *fts;
 	FTSENT *p;
 	int ftsoptions, i, n;
 
 	ftsoptions = FTS_PHYSICAL;
 
 	for (;;) {
 		for (i = 0; i < N; i++)
 			r[i] = arc4random();
 		if ((fts = fts_open(args, ftsoptions, NULL)) == NULL)
 			err(1, "fts_open");
 
 		i = n = 0;
 		while ((p = fts_read(fts)) != NULL) {
 			if (fd[i] > 0)
 				close(fd[i]);
 			if ((fd[i] = open(p->fts_path, O_RDWR)) == -1)
 				if ((fd[i] = open(p->fts_path, O_WRONLY)) ==
 				    -1)
 				continue;
 			if (ftruncate(fd[i], 0) != 0)
 				err(1, "ftruncate");
 			i++;
 			i = i % nitems(fd);
 		}
 
 		if (fts_close(fts) == -1)
 			err(1, "fts_close()");
 		sleep(1);
 	}
 	return(0);
 }
 
 static void *
 calls(void *arg __unused)
 {
 	off_t offset;
 	time_t start;
 	int fd2;
 
 	start = time(NULL);
 	while ((time(NULL) - start) < RUNTIME) {
 		fd2 = makearg() % nitems(fd) + 3;
 		offset = makearg();
 		if (lseek(fd2, offset - 1, SEEK_SET) != -1) {
 			if (write(fd2, "x", 1) != 1)
 				if (errno != EBADF && errno != ENOSPC &&
 				    errno != E2BIG && errno != ESTALE &&
 				    errno != EFBIG)
 					warn("write");
 		} else
 			if (errno != EBADF)
 				warn("lseek");
 		if (fdatasync(fd2) == -1)
 			if (errno != EBADF)
 				warn("x");
 
 	}
 
 	return (0);
 }
 
 int
 main(int argc, char **argv)
 {
 	struct passwd *pw;
 	pthread_t rp, cp[THREADS];
 	int e, i;
 
 	if (argc != 2) {
 		fprintf(stderr, "Usage: %s <dir>\n", argv[0]);
 		exit(1);
 	}
 	args[0] = argv[1];
 	args[1] = 0;
 
 	if ((pw = getpwnam("nobody")) == NULL)
 		err(1, "failed to resolve nobody");
 	if (setgroups(1, &pw->pw_gid) ||
 	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
 	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
 		err(1, "Can't drop privileges to \"nobody\"");
 	endpwent();
 
 	if ((e = pthread_create(&rp, NULL, test, NULL)) != 0)
 		errc(1, e, "pthread_create");
 	usleep(1000);
 	for (i = 0; i < THREADS; i++)
 		if ((e = pthread_create(&cp[i], NULL, calls, NULL)) != 0)
 			errc(1, e, "pthread_create");
 	for (i = 0; i < THREADS; i++)
 		pthread_join(cp[i], NULL);
 
 	return (0);
 }
Index: user/pho/stress2/misc/fdatasync2.sh
===================================================================
--- user/pho/stress2/misc/fdatasync2.sh	(revision 364803)
+++ user/pho/stress2/misc/fdatasync2.sh	(revision 364804)
@@ -1,201 +1,198 @@
 #!/bin/sh
 
 #
 # Copyright (c) 2018 Dell EMC Isilon
 # All rights reserved.
 #
 # 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.
 #
 # $FreeBSD$
 #
 
 # fdatasync(2) fuzz. Variation of fdatasync.sh.
 # https://people.freebsd.org/~pho/stress/log/fdatasync2.txt
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 . ../default.cfg
 
 dir=$RUNDIR
 nfiles=10000
 [ `df -i $dir | tail -1 | awk '{print $7}'` -lt $nfiles ] && exit 0
 
 odir=`pwd`
 cd /tmp
 sed '1,/^EOF/d' < $odir/$0 > fdatasync2.c
 rm -f /tmp/fdatasync2
 mycc -o fdatasync2 -Wall -Wextra -O2 -g fdatasync2.c -lpthread || exit 1
 rm -f fdatasync2.c
 
 mkdir -p $dir && chmod 777 $dir
 
 cd $dir
 jot $nfiles | xargs touch
 jot $nfiles | xargs chmod 666
 cd $odir
 
 (cd /tmp; /tmp/fdatasync2 $dir)
 e=$?
 
 rm -rf $dir/* /tmp/fdatasync2
 exit $e
 EOF
 #include <sys/param.h>
 #include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
 
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fts.h>
 #include <libutil.h>
 #include <pthread.h>
 #include <pwd.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #define N (128 * 1024 / (int)sizeof(u_int32_t))
 #define RUNTIME 180
 #define THREADS 6
 
 static int fd[900];
 static u_int32_t r[N];
 static char *args[2];
 
 static unsigned long
 makearg(void)
 {
 	unsigned long val;
 
 	val = arc4random();
 #if defined(__LP64__)
 	val = (val << 32) | arc4random();
 	val = val & 0x00007fffffffffffUL;
 #endif
 
 	return(val);
 }
 
 static void *
 test(void *arg __unused)
 {
 	FTS *fts;
 	FTSENT *p;
 	int ftsoptions, i, n;
 
 	ftsoptions = FTS_PHYSICAL;
 
 	for (;;) {
 		for (i = 0; i < N; i++)
 			r[i] = arc4random();
 		if ((fts = fts_open(args, ftsoptions, NULL)) == NULL)
 			err(1, "fts_open");
 
 		i = n = 0;
 		while ((p = fts_read(fts)) != NULL) {
 			if (fd[i] > 0)
 				close(fd[i]);
 			if ((fd[i] = open(p->fts_path, O_RDWR)) == -1)
 				if ((fd[i] = open(p->fts_path, O_WRONLY)) ==
 				    -1)
 				continue;
 			if (ftruncate(fd[i], 0) != 0)
 				err(1, "ftruncate");
 			i++;
 			i = i % nitems(fd);
 		}
 
 		if (fts_close(fts) == -1)
 			err(1, "fts_close()");
 		sleep(1);
 	}
 	return(0);
 }
 
 static void *
 calls(void *arg __unused)
 {
 	off_t offset;
 	time_t start;
 	int fd2;
 
 	start = time(NULL);
 	while ((time(NULL) - start) < RUNTIME) {
 		fd2 = makearg() % nitems(fd) + 3;
 		offset = makearg();
 		if (lseek(fd2, offset - 1, SEEK_SET) != -1) {
 			if (write(fd2, "x", 1) != 1)
 				if (errno != EBADF && errno != ENOSPC &&
 				    errno != E2BIG && errno != ESTALE &&
 				    errno != EFBIG)
 					warn("write");
 		} else
 			if (errno != EBADF)
 				warn("lseek");
 		if (fdatasync(fd2) == -1)
 			if (errno != EBADF)
 				warn("x");
 
 	}
 
 	return (0);
 }
 
 int
 main(int argc, char **argv)
 {
 	struct passwd *pw;
 	pthread_t rp, cp[THREADS];
 	int e, i, threads;
 
 	if (argc != 2) {
 		fprintf(stderr, "Usage: %s <dir>\n", argv[0]);
 		exit(1);
 	}
 	args[0] = argv[1];
 	args[1] = 0;
 	threads = arc4random() % (THREADS -1 ) + 2; /* 2 - THREADS */
 
 	if ((pw = getpwnam("nobody")) == NULL)
 		err(1, "failed to resolve nobody");
 	if (setgroups(1, &pw->pw_gid) ||
 	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
 	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
 		err(1, "Can't drop privileges to \"nobody\"");
 	endpwent();
 
 	if ((e = pthread_create(&rp, NULL, test, NULL)) != 0)
 		errc(1, e, "pthread_create");
 	usleep(1000);
 	for (i = 0; i < threads; i++)
 		if ((e = pthread_create(&cp[i], NULL, calls, NULL)) != 0)
 			errc(1, e, "pthread_create");
 	for (i = 0; i < threads; i++)
 		pthread_join(cp[i], NULL);
 
 	return (0);
 }
Index: user/pho/stress2/misc/ftruncate.sh
===================================================================
--- user/pho/stress2/misc/ftruncate.sh	(revision 364803)
+++ user/pho/stress2/misc/ftruncate.sh	(revision 364804)
@@ -1,194 +1,191 @@
 #!/bin/sh
 
 #
 # Copyright (c) 2016 EMC Corp.
 # All rights reserved.
 #
 # 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.
 #
 # $FreeBSD$
 #
 
 # ftruncate(2) fuzz.
 
 # "panic: softdep_deallocate_dependencies: dangling deps" seen in
 # 10.3-STABLE:
 # https://people.freebsd.org/~pho/stress/log/ftruncate.txt
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 . ../default.cfg
 
 dir=$RUNDIR
 
 odir=`pwd`
 cd /tmp
 sed '1,/^EOF/d' < $odir/$0 > ftruncate.c
 rm -f /tmp/ftruncate
 mycc -o ftruncate -Wall -Wextra -O2 -g ftruncate.c -lpthread || exit 1
 rm -f ftruncate.c
 
 rm -rf $dir
 mkdir -p $dir
 chmod 777 $dir
 
 cd $dir
 jot 500 | xargs touch
 jot 500 | xargs chmod 666
 cd $odir
 
 (cd /tmp; /tmp/ftruncate $dir)
 e=$?
 
 rm -rf $dir
 
 rm -f /tmp/ftruncate
 exit $e
 EOF
 #include <sys/param.h>
 #include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
 
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fts.h>
 #include <libutil.h>
 #include <pthread.h>
 #include <pwd.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #define N (128 * 1024 / (int)sizeof(u_int32_t))
 #define RUNTIME 180
 #define THREADS 2
 
 static int fd[900];
 static u_int32_t r[N];
 static char *args[2];
 
 static unsigned long
 makearg(void)
 {
 	unsigned long val;
 
 	val = arc4random();
 #if defined(__LP64__)
 	val = (val << 32) | arc4random();
 	val = val & 0x00007fffffffffffUL;
 #endif
 
 	return(val);
 }
 
 static void *
 test(void *arg __unused)
 {
 	FTS *fts;
 	FTSENT *p;
 	int ftsoptions, i, n;
 
 	ftsoptions = FTS_PHYSICAL;
 
 	for (;;) {
 		for (i = 0; i < N; i++)
 			r[i] = arc4random();
 		if ((fts = fts_open(args, ftsoptions, NULL)) == NULL)
 			err(1, "fts_open");
 
 		i = n = 0;
 		while ((p = fts_read(fts)) != NULL) {
 			if (fd[i] > 0)
 				close(fd[i]);
 			if ((fd[i] = open(p->fts_path, O_RDWR)) == -1)
 				if ((fd[i] = open(p->fts_path, O_WRONLY)) == -1)
 				continue;
 			i++;
 			i = i % nitems(fd);
 		}
 
 		if (fts_close(fts) == -1)
 			err(1, "fts_close()");
 		sleep(1);
 	}
 	return(0);
 }
 
 static void *
 calls(void *arg __unused)
 {
 	off_t offset;
 	time_t start;
 	int fd2;
 
 	start = time(NULL);
 	while ((time(NULL) - start) < RUNTIME) {
 		fd2 = makearg() % nitems(fd) + 3;
 		offset = makearg();
 		if (ftruncate(fd2, offset) == 0) {
 			if (lseek(fd2, offset - 1, SEEK_SET) != -1)
 				write(fd2, "x", 1);
 		}
 
 	}
 
 	return (0);
 }
 
 int
 main(int argc, char **argv)
 {
 	struct passwd *pw;
 	pthread_t rp, cp[THREADS];
 	int e, i;
 
 	if (argc != 2) {
 		fprintf(stderr, "Usage: %s <dir>\n", argv[0]);
 		exit(1);
 	}
 	args[0] = argv[1];
 	args[1] = 0;
 
 	if ((pw = getpwnam("nobody")) == NULL)
 		err(1, "failed to resolve nobody");
 	if (setgroups(1, &pw->pw_gid) ||
 	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
 	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
 		err(1, "Can't drop privileges to \"nobody\"");
 	endpwent();
 
 	if ((e = pthread_create(&rp, NULL, test, NULL)) != 0)
 		errc(1, e, "pthread_create");
 	usleep(1000);
 	for (i = 0; i < THREADS; i++)
 		if ((e = pthread_create(&cp[i], NULL, calls, NULL)) != 0)
 			errc(1, e, "pthread_create");
 	for (i = 0; i < THREADS; i++)
 		pthread_join(cp[i], NULL);
 
 	return (0);
 }
Index: user/pho/stress2/misc/tmpfs16.sh
===================================================================
--- user/pho/stress2/misc/tmpfs16.sh	(revision 364803)
+++ user/pho/stress2/misc/tmpfs16.sh	(revision 364804)
@@ -1,205 +1,202 @@
 #!/bin/sh
 
 #
 # Copyright (c) 2016 EMC Corp.
 # All rights reserved.
 #
 # 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.
 #
 # $FreeBSD$
 #
 
 # A fuzz test using random file descriptors with random seeks.
 # "panic: Assertion (cookie & TMPFS_DIRCOOKIE_MASK) == cookie failed":
 # https://people.freebsd.org/~pho/stress/log/kostik922.txt
 # Fixed by r303916.
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 . ../default.cfg
 
 mount | grep -q "on $mntpoint " && umount -f $mntpoint
 mount -o size=1g -t tmpfs tmpfs $mntpoint
 RUNDIR=$mntpoint/stressX
 dir=$RUNDIR
 
 odir=`pwd`
 cd /tmp
 sed '1,/^EOF/d' < $odir/$0 > tmpfs16.c
 rm -f /tmp/tmpfs16
 mycc -o tmpfs16 -Wall -Wextra -O2 -g tmpfs16.c -lpthread || exit 1
 rm -f tmpfs16.c
 
 rm -rf $dir
 mkdir -p $dir
 chmod 777 $dir
 
 cd $dir
 jot 500 | xargs touch
 jot 500 | xargs chmod 666
 cd $odir
 
 (cd /tmp; /tmp/tmpfs16 $dir)
 e=$?
 
 rm -rf $dir
 umount $mntpoint
 
 rm -f /tmp/tmpfs16
 exit $e
 EOF
 #include <sys/param.h>
 #include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
 
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fts.h>
 #include <libutil.h>
 #include <pthread.h>
 #include <pwd.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #define N (128 * 1024 / (int)sizeof(u_int32_t))
 #define RUNTIME 180
 #define THREADS 2
 
 static int fd[900];
 static u_int32_t r[N];
 static char *args[2];
 
 static unsigned long
 makearg(void)
 {
 	unsigned long val;
 
 	val = arc4random();
 #if defined(__LP64__)
 	val = (val << 31) | arc4random();
 	val = val & 0x00007fffffffffffUL;
 #endif
 
 	return(val);
 }
 
 static void *
 test(void *arg __unused)
 {
 	FTS *fts;
 	FTSENT *p;
 	int ftsoptions, i, n;
 
 	ftsoptions = FTS_PHYSICAL;
 
 	for (;;) {
 		for (i = 0; i < N; i++)
 			r[i] = arc4random();
 		if ((fts = fts_open(args, ftsoptions, NULL)) == NULL)
 			err(1, "fts_open");
 
 		i = n = 0;
 		while ((p = fts_read(fts)) != NULL) {
 			if (fd[i] > 0)
 				close(fd[i]);
 			if ((fd[i] = open(p->fts_path, O_RDWR)) == -1)
 				if ((fd[i] = open(p->fts_path, O_WRONLY)) == -1)
 				continue;
 			if (ftruncate(fd[i], 0) != 0)
 				err(1, "ftruncate");
 			i++;
 			i = i % nitems(fd);
 		}
 
 		if (fts_close(fts) == -1)
 			err(1, "fts_close()");
 		sleep(1);
 	}
 	return(0);
 }
 
 static void *
 calls(void *arg __unused)
 {
 	off_t offset;
 	time_t start;
 	int fd2;
 
 	start = time(NULL);
 	while ((time(NULL) - start) < RUNTIME) {
 		fd2 = makearg() % nitems(fd) + 3;
 		offset = makearg();
 		if (lseek(fd2, offset - 1, SEEK_SET) != -1) {
 			if (write(fd2, "x", 1) != 1)
 				if (errno != EBADF && errno != ENOSPC)
 					warn("write");
 		} else
 			if (errno != EBADF)
 				warn("lseek");
 		if (fsync(fd2) == -1)
 			if (errno != EBADF)
 				warn("x");
 
 	}
 
 	return (0);
 }
 
 int
 main(int argc, char **argv)
 {
 	struct passwd *pw;
 	pthread_t rp, cp[THREADS];
 	int e, i;
 
 	if (argc != 2) {
 		fprintf(stderr, "Usage: %s <dir>\n", argv[0]);
 		exit(1);
 	}
 	args[0] = argv[1];
 	args[1] = 0;
 
 	if ((pw = getpwnam("nobody")) == NULL)
 		err(1, "failed to resolve nobody");
 	if (setgroups(1, &pw->pw_gid) ||
 	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
 	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
 		err(1, "Can't drop privileges to \"nobody\"");
 	endpwent();
 
 	if ((e = pthread_create(&rp, NULL, test, NULL)) != 0)
 		errc(1, e, "pthread_create");
 	usleep(1000);
 	for (i = 0; i < THREADS; i++)
 		if ((e = pthread_create(&cp[i], NULL, calls, NULL)) != 0)
 			errc(1, e, "pthread_create");
 	for (i = 0; i < THREADS; i++)
 		pthread_join(cp[i], NULL);
 
 	return (0);
 }