Hello, I've got a strange issue with ceph (ceph-adm). We use Incus (LXD reborn) and we used to add/remove containers. We had moved to Ceph for better scalability but sometimes we get this bug : https://discuss.linuxcontainers.org/t/howto-delete-container-with-ceph-rbd-v... And I respawn this old bug in Incus : https://discuss.linuxcontainers.org/t/incus-0-x-and-ceph-rbd-map-is-sometime... (thanks for Stephane GRABER help !) After working on it for several hours. I find this : I do a loop who do this script (create image / map it / format it /mount it / write on it / unmount / unmap / delete image) : rbd create image1 --size 1024 --pool customers-clouds.ix-mrs2.fr.eho || exit $? RBD_DEVICE=$(rbd map customers-clouds.ix-mrs2.fr.eho/image1 || exit $? ) mkfs.ext4 ${RBD_DEVICE} || exit $? mount ${RBD_DEVICE} /media/test || exit $? dd if=/dev/zero of=/media/test/test.out sleep 10 rm /media/test/test.out || exit $? umount ${RBD_DEVICE} || exit $? rbd unmap ${RBD_DEVICE} || exit $? rbd rm customers-clouds.ix-mrs2.fr.eho/image1 || exit $? sleep 1 It works for hours without any issue BUT if I add an OSD while doing this loop I get this : + sleep 10 + rm /media/test/test.out + umount /dev/rbd0 + rbd unmap /dev/rbd0 rbd: sysfs write failed rbd: unmap failed: (16) Device or resource busy + exit 16 And ... of course the winner is always the podman of the latest OSD i've added (it holds a copy of the mounting point) root@ceph01:~# grep rbd0 /proc/*/mountinfo/proc/1415299/mountinfo:1959 1837 252:0 / /rootfs/media/test rw,relatime - ext4 /dev/rbd0 rw,stripe=16/proc/1415301/mountinfo:1959 1837 252:0 / /rootfs/media/test rw,relatime - ext4 /dev/rbd0 rw,stripe=16 root@ceph01:~# cat /proc/1415299/cmdline /run/podman-init--/usr/bin/ceph-osd-nosd.26-f--setuserceph--setgroupceph--default-log-to-file=false--default-log-to-journald=true--default-log-to-stderr=falseroot@ceph01-b15r56-2r016.ix-mrs2.fr.eho.admin:~# root@ceph01:~# cat /proc/1415301/cmdline /usr/bin/ceph-osd-nosd.26-f--setuserceph--setgroupceph--default-log-to-file=false--default-log-to-journald=true--default-log-to-stderr=falseroot@ceph01-b15r56-2r016.ix-mrs2.fr.eho.admin:~# Our setup is straight forward : latest stable Ceph release, latest Debian stable release, and deploying via ceph-adm Did someone have such a problem ? Where is the best place to report this bug ?