Hi,
Since this commit:
commit ec44610fe2b86daef70f3f53f47d2a2542d7094f
Author: Amir Goldstein <amir73il@xxxxxxxxx>
Date: Tue Aug 10 18:12:19 2021 +0300
fsnotify: count all objects with attached connectors
Kernel fsnotify can't finish a stress testcase that used to pass quickly.
Kernel hung at umount. Can not be killed but restarting the server.
Reproducer text is attached.
Thanks,
Murphy
--- reproducer test.sh start -------------------------------------
#!/bin/bash
cc fanotify_init_stress.c -o fanotify_init_stress || exit
cc fanotify_flush_stress.c -o fanotify_flush_stress || exit
export TIMEOUT=10s
STRESSES="fanotify_flush_stress fanotify_init_stress"
function cleanup_processes()
{
while ps jf | egrep "fanotify_flush_stress|fanotify_init_stress" | grep -v grep ; do
killall fanotify_init_stress > /dev/null 2>&1
killall fanotify_flush_stress > /dev/null 2>&1
sleep 1
done
}
SCRATCH_MNT=/fsn
fallocate -l 1G fsn.img || exit
mkfs.xfs -f fsn.img || exit
mkdir -p $SCRATCH_MNT
mount -o loop fsn.img $SCRATCH_MNT || exit
touch $SCRATCH_MNT/testfile
for i in $STRESSES
do
for j in $STRESSES
do
echo testing $i $j
./$i $SCRATCH_MNT $TIMEOUT > /dev/null 2>&1 &
./$i $SCRATCH_MNT/testfile $TIMEOUT > /dev/null 2>&1 &
./$j $SCRATCH_MNT $TIMEOUT > /dev/null 2>&1 &
./$j $SCRATCH_MNT/testfile $TIMEOUT > /dev/null 2>&1 &
sleep $TIMEOUT
cleanup_processes
done
done
sleep $TIMEOUT
sync
umount $SCRATCH_MNT
rm -rf fsn* tmp
--- reproducer test.sh end -------------------------------------
--- reproducer fanotify_flush_stress.c start----------------
#define _GNU_SOURCE /* Needed to get O_LARGEFILE definition */
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/fanotify.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char *argv[])
{
char buf;
int fd;
#if 0
/* Check mount point is supplied */
if (argc != 2) {
fprintf(stderr, "Usage: %s MOUNT\n", argv[0]);
exit(EXIT_FAILURE);
}
#endif
printf("%s on %s\n", argv[0], argv[1]);
/* Create the file descriptor for accessing the fanotify API */
fd = fanotify_init(FAN_CLOEXEC | FAN_CLASS_CONTENT | FAN_NONBLOCK,
O_RDONLY | O_LARGEFILE);
if (fd == -1) {
perror("fanotify_init");
exit(EXIT_FAILURE);
}
/* Loop marking all kinds of events and flush */
while (1) {
if (fanotify_mark(fd, FAN_MARK_ADD | FAN_MARK_MOUNT,
FAN_ACCESS | FAN_MODIFY | FAN_OPEN_PERM | FAN_CLOSE |
FAN_OPEN | FAN_ACCESS_PERM | FAN_ONDIR |
FAN_EVENT_ON_CHILD, -1, argv[1]) == -1)
perror("fanotify_mark add");
if (fanotify_mark(fd, FAN_MARK_FLUSH | FAN_MARK_MOUNT,
0, -1, argv[1]) == -1)
perror("fanotify_mark flush mount");
if (fanotify_mark(fd, FAN_MARK_ADD | FAN_MARK_MOUNT,
FAN_ACCESS | FAN_MODIFY | FAN_OPEN_PERM | FAN_CLOSE |
FAN_OPEN | FAN_ACCESS_PERM | FAN_ONDIR |
FAN_EVENT_ON_CHILD, -1, argv[1]) == -1)
perror("fanotify_mark add");
if (fanotify_mark(fd, FAN_MARK_FLUSH, 0, -1, argv[1]) == -1)
perror("fanotify_mark flush");
}
close(fd);
exit(EXIT_SUCCESS);
}
--- reproducer fanotify_flush_stress.c end ----------------
--- reproducer fanotify_init_stress.c start -----------_
#define _GNU_SOURCE /* Needed to get O_LARGEFILE definition */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/fanotify.h>
int main(int argc, char *argv[])
{
char buf;
int fd;
#if 0
/* Check mount point is supplied */
if (argc != 2) {
fprintf(stderr, "Usage: %s MOUNT\n", argv[0]);
exit(EXIT_FAILURE);
}
#endif
printf("%s on %s\n", argv[0], argv[1]);
while (1) {
/* Create the file descriptor for accessing the fanotify API */
fd = fanotify_init(FAN_CLOEXEC | FAN_CLASS_CONTENT |
FAN_NONBLOCK, O_RDONLY | O_LARGEFILE);
if (fd == -1)
perror("fanotify_init");
if (fanotify_mark(fd, FAN_MARK_ADD | FAN_MARK_MOUNT,
FAN_ACCESS | FAN_MODIFY | FAN_OPEN_PERM |
FAN_CLOSE | FAN_OPEN | FAN_ACCESS_PERM |
FAN_ONDIR | FAN_EVENT_ON_CHILD, -1,
argv[1]) == -1)
perror("fanotify_mark");
close(fd);
}
exit(EXIT_SUCCESS);
}
--- reproducer fanotify_init_stress.c end -----------_
