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|
#!/bin/sh
# File corruption scenario
# Test program by Rob Norris <rob norris klarasystems com>
# Test program obtained from: https://gist.github.com/robn/9804c60cd0275086d26893d73e7af35c
# https://github.com/openzfs/zfs/issues/15654
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
set -u
prog=$(basename "$0" .sh)
cat > /tmp/$prog.c <<EOF
/*
* Some kind of clone-related crasher. Not sure if legit or just outdated
* assertion.
*
* Creates clone, maps it, writes from map back into itself.
*
* Compile a recent (2.2+) ZFS with --enable-debug.
*
* cc -o mapwrite mapwrite.c
*
* echo 1 > /sys/modules/zfs/parameters/zfs_bclone_enabled
* zpool create tank ...
* cd /tank
* mapwrite
*
* [ 7.666305] VERIFY(arc_released(db->db_buf)) failed
* [ 7.666443] PANIC at dbuf.c:2150:dbuf_redirty()
* [ 7.666489] Showing stack for process 608
* [ 7.666534] CPU: 1 PID: 608 Comm: mapwrite Tainted: P O 5.10.170 #3
* [ 7.666610] Call Trace:
* [ 7.666646] dump_stack+0x57/0x6e
* [ 7.666717] spl_panic+0xd3/0xfb [spl]
* [ 7.667113] ? zfs_btree_find+0x16a/0x300 [zfs]
* [ 7.667278] ? range_tree_find_impl+0x55/0xa0 [zfs]
* [ 7.667333] ? _cond_resched+0x1a/0x50
* [ 7.667371] ? __kmalloc_node+0x14a/0x2b0
* [ 7.667415] ? spl_kmem_alloc_impl+0xb0/0xd0 [spl]
* [ 7.667555] ? __list_add+0x12/0x30 [zfs]
* [ 7.667681] spl_assert+0x17/0x20 [zfs]
* [ 7.667807] dbuf_redirty+0xad/0xb0 [zfs]
* [ 7.667963] dbuf_dirty+0xe76/0x1310 [zfs]
* [ 7.668011] ? mutex_lock+0xe/0x30
* [ 7.668133] ? dbuf_noread+0x112/0x240 [zfs]
* [ 7.668271] dmu_write_uio_dnode+0x101/0x1b0 [zfs]
* [ 7.668411] dmu_write_uio_dbuf+0x4a/0x70 [zfs]
* [ 7.668555] zfs_write+0x500/0xc80 [zfs]
* [ 7.668610] ? page_add_file_rmap+0xe/0xb0
* [ 7.668740] zpl_iter_write+0xe4/0x130 [zfs]
* [ 7.668803] new_sync_write+0x119/0x1b0
* [ 7.668843] vfs_write+0x1ce/0x260
* [ 7.668880] __x64_sys_pwrite64+0x91/0xc0
* [ 7.668918] do_syscall_64+0x30/0x40
* [ 7.668957] entry_SYSCALL_64_after_hwframe+0x61/0xc6
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/mman.h>
#define DATASIZE (1024*1024)
char data[DATASIZE];
#define NDATA (512)
#define FILE_NAME "file"
#define CLONE_NAME "clone"
static int
_create_file(void)
{
memset(data, 0x5a, DATASIZE);
int fd;
if ((fd = open(FILE_NAME, O_RDWR | O_CREAT | O_APPEND,
S_IRUSR | S_IWUSR)) < 0) {
perror("open '" FILE_NAME "'");
abort();
}
for (int i = 0; i < NDATA; i++) {
int nwr = write(fd, data, DATASIZE);
if (nwr < 0) {
perror("write");
abort();
}
if (nwr < DATASIZE) {
fprintf(stderr, "short write\n");
abort();
}
}
if (lseek(fd, 0, SEEK_SET) < 0) {
perror("lseek");
abort();
}
sync();
return (fd);
}
static int
_clone_file(int sfd)
{
int dfd;
if ((dfd = open(CLONE_NAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) < 0) {
perror("open '" CLONE_NAME "'");
abort();
}
if (copy_file_range(sfd, 0, dfd, 0, DATASIZE * NDATA, 0) < 0) {
perror("copy_file_range");
abort();
}
return (dfd);
}
static void *
_map_file(int fd)
{
void *p = mmap(NULL, DATASIZE*NDATA, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
perror("mmap");
abort();
}
return (p);
}
static void
_map_write(void *p, int fd)
{
if (pwrite(fd, p, DATASIZE, 0) < 0) {
perror("pwrite");
abort();
}
}
int
main(void)
{
int sfd = _create_file();
int dfd = _clone_file(sfd);
void *p = _map_file(dfd);
_map_write(p, dfd);
return (0);
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O2 /tmp/$prog.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
mycc -o /tmp/swap -Wall -Wextra -O0 ../tools/swap.c || exit 1
timeout -k 90 60 /tmp/swap -d 100 &
for i in `jot 10`; do
capacity=`swapinfo | tail -1 | sed 's/.* //; s/%//'`
[ $capacity -gt 1 ] && break
sleep 2 # Wait for swapping
done
cd $mntpoint
/tmp/$prog; s=$?
pkill swap
wait
cmp $mntpoint/file $mntpoint/clone || { echo Fail; s=1; }
cd -
umount $mntpoint
mdconfig -d -u $mdstart
rm /tmp/$prog /tmp/$prog.c
exit $s
|
