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|
#!/bin/sh
#
# Copyright (c) 2024 Peter Holm <pho@FreeBSD.org>
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Demonstrate issue described in:
# [Bug 276002] nfscl: data corruption using both copy_file_range and mmap'd I/O
# This version only uses mapped read/write, read(2)/write(2), fstat(2) and ftruncate(2)
# Issue seen:
# 20241003 10:04:24 all: mmap48.sh
# 5257c5257
# < 0244200 80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f
# ---
# > 0244200 80 81 82 83 84 85 86 87 88 ee 8a 8b 8c 8d 8e 8f
# 256 -rw------- 1 root wheel 262144 Oct 3 10:05 file
# 256 -rw------- 1 root wheel 262144 Oct 3 10:04 file.orig
# FAIL mmap48.sh exit code 2
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
set -u
prog=$(basename "$0" .sh)
log=/tmp/$prog.log
serial=/tmp/$prog.serial
grep -q $mntpoint /etc/exports ||
{ echo "$mntpoint missing from /etc/exports"; exit 0; }
rpcinfo 2>/dev/null | grep -q mountd || exit 0
cat > /tmp/$prog.c <<EOF
#include <sys/mman.h>
#include <sys/stat.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <pthread.h>
#include <pthread_np.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static off_t siz;
static pthread_mutex_t write_mutex;
static int fd, go;
static char *cp;
#define THREADS 100
static void *
memread(void *arg __unused)
{
int i;
char c;
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
i = arc4random() % siz;
c = cp[i];
if (c != 0x77) /* No unused vars here */
usleep(arc4random() % 400);
}
return (NULL);
}
static void *
memwrite(void *arg __unused)
{
int i;
char c;
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
i = arc4random() % siz;
pthread_mutex_lock(&write_mutex);
c = cp[i];
cp[i] = 0xee; /* This value seems to linger with NFS */
cp[i] = c;
pthread_mutex_unlock(&write_mutex);
usleep(arc4random() % 400);
}
return (NULL);
}
static void *
wr(void *arg __unused)
{
off_t pos;
int r, s;
char buf[1024];
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
s = arc4random() % sizeof(buf) + 1;
pos = arc4random() % (siz - s);
pthread_mutex_lock(&write_mutex);
if (lseek(fd, pos, SEEK_SET) == -1)
err(1, "lseek(%d)", (int)pos);
if ((r = read(fd, buf, s)) != s) {
fprintf(stderr, "r = %d, s = %d, pos = %d\n", r, s, (int)pos);
err(1, "read():2");
}
if (lseek(fd, pos, SEEK_SET) == -1)
err(1, "lseek(%d)", (int)pos);
if (write(fd, buf, s) != s)
err(1, "write()");
pthread_mutex_unlock(&write_mutex);
usleep(arc4random() % 200);
}
return (NULL);
}
/* Both ftruncate() and fdatasync() triggers the problem */
static void *
sy(void *arg __unused)
{
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
if (fdatasync(fd) == -1)
err(1, "fdatasync()");
usleep(arc4random() % 1000);
}
return (NULL);
}
static void *
tr(void *arg __unused)
{
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
if (ftruncate(fd, siz) == -1) /* No size change */
err(1, "truncate)");
usleep(arc4random() % 1000);
}
return (NULL);
}
static void *
fs(void *arg __unused)
{
struct stat st;
if (arc4random() % 100 < 10)
return (0);
pthread_set_name_np(pthread_self(), __func__);
while (go == -1)
usleep(50);
while (go == 1) {
if (fstat(fd, &st) == -1)
err(1, "stat()");
usleep(arc4random() % 1000);
}
return (NULL);
}
int
main(int argc, char *argv[])
{
struct stat st;
pthread_t tp[THREADS];
int e, i, idx;
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
exit(1);
}
if ((fd = open(argv[1], O_RDWR)) == -1)
err(1, "open(%s)", argv[1]);
if (fstat(fd, &st) == -1)
err(1, "stat(%s)", argv[1]);
siz = st.st_size;
cp = mmap(NULL, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (cp == MAP_FAILED)
err(1, "mmap()");
go = -1;
pthread_mutex_init(&write_mutex, NULL);
idx = 0;
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, memread, NULL)) != 0)
errc(1, e, "pthread_create");
}
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, memwrite, NULL)) != 0)
errc(1, e, "pthread_create");
}
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, wr, NULL)) != 0)
errc(1, e, "pthread_create");
}
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, fs, NULL)) != 0)
errc(1, e, "pthread_create");
}
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, tr, NULL)) != 0)
errc(1, e, "pthread_create");
}
for (i = 0; i < (int)(arc4random() % 3 + 1); i++) {
if ((e = pthread_create(&tp[idx++], NULL, sy, NULL)) != 0)
errc(1, e, "pthread_create");
}
assert(idx <= THREADS);
sleep(1);
go = 1;
sleep(60);
go = 0;
for (i = 0; i < idx; i++)
pthread_join(tp[i], NULL);
if (munmap(cp, siz) == -1)
err(1, "munmap()");
close(fd);
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -lpthread || exit 1
mycc -o $serial -Wall -Wextra -O2 ../tools/serial.c || exit 1
mount | grep -q "on $mntpoint " && umount -f $mntpoint
mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
mdconfig -s 5g -u $mdstart
newfs -n $newfs_flags /dev/md$mdstart > /dev/null
mount /dev/md$mdstart $mntpoint
mp2=${mntpoint}2
mkdir -p $mp2
mount | grep -q "on $mp2 " && umount -f $mp2
mount -t nfs -o retrycnt=3 127.0.0.1:$mntpoint $mp2 || exit 1
sleep .2
here=`pwd`
cd $mp2
#$here/../testcases/swap/swap -t 5m -i 20 > /dev/null &
sleep 2
size=262144
$serial file $size
cp file file.orig
s=0
#ktrace -id -f $here/ktrace.out /tmp/$prog file || s=1
/tmp/$prog file || s=1
while pgrep -q swap; do pkill swap; done
wait
if ! cmp -s file.orig file; then
od -t x1 file.orig > /var/tmp/$prog.file1
od -t x1 file > /var/tmp/$prog.file2
diff /var/tmp/$prog.file1 /var/tmp/$prog.file2 > $log
head -20 $log
rm /var/tmp/$prog.file1 /var/tmp/$prog.file2
ls -ls file.orig file
s=2
fi
cd $here
umount $mp2
umount $mntpoint
mdconfig -d -u $mdstart
rm -f $serial /tmp/$prog /tmp/$prog.c $log
exit $s
|
