I added debug into the kernel and observed /dev/vdb is being mounted by systemd:
[ 9.859895] mount: 1624 mount, parent 1 systemd [ 9.866398] mount: 1624 mount /dev/vdb and also snap-confine is mounting mount too: [ 9.966827] mount: 1663 snap-confine /mnt Curiously, I've not seen any associated umounts. I wonder if the namespace/confinement is causing the issue of not being able to see the mount. I need to debug this further. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1801349 Title: zpool create -f lxd /dev/vdb fails on cosmic (18.10) -- func27 Status in OpenStack LXD Charm: New Status in linux package in Ubuntu: In Progress Bug description: Test: tests/gate-basic-cosmic-rocky As part of the config, the lxd charm creates a pool device depending on the config. The test config is: lxd_config = { 'block-devices': '/dev/vdb', 'ephemeral-unmount': '/mnt', 'storage-type': 'zfs', 'overwrite': True } The config drive is normally mounted on /mnt, and the lxd charm umounts it as part of the start up. The /etc/fstab on the unit is: # cat /etc/fstab LABEL=cloudimg-rootfs / ext4 defaults 0 0 LABEL=UEFI /boot/efi vfat defaults 0 0 /dev/vdb /mnt auto defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig 0 2 /dev/vdc none swap sw,comment=cloudconfig 0 0 However, even after umount-ing the /mnt off of /dev/vdb, the zpool create command still fails: # zpool create -f lxd /dev/vdb /dev/vdb is in use and contains a unknown filesystem. If the /etc/fstab is edited so that /dev/vdb is *never* mounted and then rebooted, then the zpool create command succeeds: # zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT lxd 14.9G 106K 14.9G - 0% 0% 1.00x ONLINE - # zpool status lxd pool: lxd state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM lxd ONLINE 0 0 0 vdb ONLINE 0 0 0 errors: No known data errors Something odd is going on with cosmic (18.10) and the combination of lxd, zfs and the kernel lxd version: 3.6 zfsutils-linux/cosmic,now 0.7.9-3ubuntu6 Linux: 4.18.0-10-generic To manage notifications about this bug go to: https://bugs.launchpad.net/charm-lxd/+bug/1801349/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
