Zheng, please address Kens' comment.

Steps to Reproduce:

1. git clone upstream ceph source
2. git checkout -b nautilus origin/nautilus
3. git show 4802061055d676fb8b98cb03a3e441b3537acfc0 | patch -p1 -R #revert fix
4. ./do_cmake.sh; cd build; make -j8 # compile ceph
5. ../src/vstart.sh -n # setup vstart cluster
6. edit ./ceph.conf and add 'osd_deep_scrub_large_omap_object_key_threshold = 1000' to mds section
7. killall ceph-mds; bin/ceph-mds -i a # restart mds
8. mount cephfs at /mnt/ceph # must be kernel mount, you can find admin keyring at ./keyring
9. run following python script with sudo


#!/bin/python
import os
import sys
import time

mnt_path = '/mnt/ceph'
ceph_path = os.getcwd()


def flush_journal():
    os.chdir(ceph_path)
    os.system('bin/ceph daemon mds.a flush journal')
    os.chdir(mnt_path)

fd = -1

os.chdir(mnt_path)
os.system('echo 3 > /proc/sys/vm/drop_caches')

while True:
    fds = []
    for i in range(1, 1010):
        f = os.open("file%d" % i, os.O_CREAT | os.O_RDWR, 0666)
        fds.append(f)

    if fd >= 0:
        os.close(fd)
        os.system('echo 3 > /proc/sys/vm/drop_caches')
        time.sleep(10)
        flush_journal()


    fd= os.open("file0", os.O_CREAT | os.O_RDWR, 0666)
    flush_journal()

    for f in fds:
        os.close(f)
    os.system('echo 3 > /proc/sys/vm/drop_caches')
    time.sleep(10)
    flush_journal()

9. run 'rados -p cephfs.a.meta ls | grep mds0_openfiles' in another terminal. keep if object count keep increasing (about every 30s)


Actual Results:

count of 'mds0_openfiles.xxx' objects keeps increasing


Expected Results:

Above python script only create two mds0_openfiles objects.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:2231