The issue is easily reproducible on my side:
$ uname -r
6.8.0-62-generic
$ sudo snap install microceph
2025-06-27T09:12:27Z INFO Waiting for automatic snapd restart...
microceph (squid/stable) 19.2.0+snapab139d4a1f from Canonical✓ installed
$ sudo microceph cluster bootstrap
$ sudo microceph.ceph osd crush rule rm replicated_rule
$ sudo microceph.ceph osd crush rule create-replicated single default osd
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 50.9M 1 loop /snap/snapd/24718
loop1 7:1 0 66.8M 1 loop /snap/core24/1006
loop2 7:2 0 111.8M 1 loop /snap/microceph/1393
sda 8:0 0 93.1G 0 disk
├─sda1 8:1 0 1G 0 part /boot/efi
└─sda2 8:2 0 92.1G 0 part /
sdb 8:16 0 20G 0 disk
$ sudo microceph disk add /dev/sdb --wipe
+----------+---------+
| PATH | STATUS |
+----------+---------+
| /dev/sdb | Success |
+----------+---------+
$ sudo microceph.ceph config set global osd_pool_default_size 1
$ sudo microceph.ceph osd pool create cephfs_metadata 8
pool 'cephfs_metadata' created
$ sudo microceph.ceph osd pool create cephfs_data 8
pool 'cephfs_data' created
$ sudo microceph.ceph fs new cephfs cephfs_metadata cephfs_data
Pool 'cephfs_data' (id '3') has pg autoscale mode 'on' but is not marked as
bulk.
Consider setting the flag by running
# ceph osd pool set cephfs_data bulk true
new fs with metadata pool 1 and data pool 3
$ sudo microceph.ceph auth get-or-create client.admin mon 'allow *' mds 'allow
*' osd 'allow *' mgr 'allow *'
[client.admin]
key = XXXYYYZZZ
$ sudo mkdir -p /mnt/cephfs
$ sudo mount -t ceph $(hostname -I | awk '{print $1}'):6789:/ /mnt/cephfs -o
name=admin,secret=XXXYYYZZZ
$ mount
...
192.168.1.20:6789:/ on /mnt/cephfs type ceph
(rw,relatime,name=admin,secret=<hidden>,acl)
$ cd /mnt/cephfs/
$ sudo touch before.txt
$ ll
total 4
drwxr-xr-x 2 root root 1 Jun 27 09:18 ./
drwxr-xr-x 3 root root 4096 Jun 27 09:14 ../
-rw-r--r-- 1 root root 0 Jun 27 09:18 before.txt
$ sudo dmesg | tail
...
[ 152.158221] netfs: FS-Cache loaded
[ 152.186537] ceph: loaded (mds proto 32)
[ 152.189962] libceph: mon0 (1)192.168.1.20:6789 session established
[ 152.190529] libceph: client14165 fsid 44252ee5-5d40-4334-8290-df906d1a0655
$ sudo apt install selinux-basics selinux-policy-default
$ sudo selinux-activate
$ sudo reboot
$ sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: default
Current mode: permissive
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: allowed
Memory protection checking: actual (secure)
Max kernel policy version: 33
$ sudo mount -t ceph $(hostname -I | awk '{print $1}'):6789:/ /mnt/cephfs -o
name=admin,secret=XXXYYYZZZ
$ cd /mnt/cephfs/
$ sudo touch after.txt
Killed
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/2115447
Title:
Ubuntu 24.04.2: NULL pointer dereference with Ceph and selinux
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