blkid output was above. and as I said in my first comment the entry in /etc/fstab is wrong. there is no LABEL=METADATA device. So 'mount' *should* fail, but I would have expected it to exit non-zero.
I noticed just now that '/etc/fstab' has 'nofail' for that line. I removed that, and it fails as you show and as expected. So the issue here is really just 2 things a.) the Canonical provided image has a bogus and confusing entry in /etc/fstab b.) mount really should not exit '0' when explicitly asked to mount something even if it has 'nofail'. heres the info you asked for: $ mount -l -vvv /var/lib/cloud/seed/config_drive; echo $? 0 $ blkid /dev/xvda1: LABEL="cloudimg-bootfs" UUID="63ea63a7-f64c-493c-90d4-384adc196be9" TYPE="ext3" PARTUUID="3276fc6f-01" /dev/xvda2: LABEL="cloudimg-rootfs" UUID="82ca1e17-8bc2-4895-96bb-3c39e5863238" TYPE="ext4" PARTUUID="3276fc6f-02" /dev/xvdh: SEC_TYPE="msdos" LABEL="config-2" UUID="9796-932E" TYPE="vfat" /dev/xvdb1: LABEL="SWAP-xvdb1" UUID="d51fcca0-6b10-4934-a572-f3898dfd8840" TYPE="swap" PARTUUID="00025cdb-01" $ cat /proc/mounts sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 udev /dev devtmpfs rw,nosuid,relatime,size=483664k,nr_inodes=120916,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=101204k,mode=755 0 0 /dev/xvda2 / ext4 rw,relatime,data=ordered 0 0 securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0 tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0 cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0 pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0 cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0 cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0 cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0 cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0 cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0 cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0 cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0 cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0 cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0 debugfs /sys/kernel/debug debugfs rw,relatime 0 0 systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=37,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0 mqueue /dev/mqueue mqueue rw,relatime 0 0 none /proc/xen xenfs rw,relatime 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 /dev/xvda1 /boot ext3 rw,relatime,data=ordered 0 0 lxcfs /var/lib/lxcfs fuse.lxcfs rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other 0 0 tmpfs /run/user/0 tmpfs rw,nosuid,nodev,relatime,size=101204k,mode=700 0 0 /dev/xvdh /mnt vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0 $ ls -altr /dev/disk/by-label/ total 0 drwxr-xr-x 4 root root 80 Dec 5 15:39 .. drwxr-xr-x 2 root root 120 Dec 5 15:39 . lrwxrwxrwx 1 root root 10 Dec 5 15:39 config-2 -> ../../xvdh lrwxrwxrwx 1 root root 11 Dec 5 15:39 cloudimg-bootfs -> ../../xvda1 lrwxrwxrwx 1 root root 11 Dec 5 15:39 SWAP-xvdb1 -> ../../xvdb1 lrwxrwxrwx 1 root root 11 Dec 5 15:40 cloudimg-rootfs -> ../../xvda2 ** Changed in: util-linux (Ubuntu) Status: New => Confirmed ** Changed in: util-linux (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1736556 Title: mount can exit (success) when it fails Status in util-linux package in Ubuntu: Confirmed Bug description: I'm on softlayer in an official Ubuntu image and 'mount' exits success even when it fails. $ cat /etc/cloud/build.info build_name: server serial: 20171116 $ cat /etc/fstab LABEL=cloudimg-rootfs / ext4 defaults,relatime 0 0 # Added by Cloud Image build process LABEL=cloudimg-bootfs /boot ext3 defaults,relatime 0 0 # CLOUD_IMG: This file was created/modified by the Cloud Image build process # Mount the metadata disk for cloud-init, if present LABEL=METADATA /var/lib/cloud/seed/config_drive vfat defaults,nofail 0 0 LABEL=SWAP-xvdb1 none swap sw,comment=cloudconfig 0 2 $ blkid /dev/xvda1: LABEL="cloudimg-bootfs" UUID="63ea63a7-f64c-493c-90d4-384adc196be9" TYPE="ext3" PARTUUID="3276fc6f-01" /dev/xvda2: LABEL="cloudimg-rootfs" UUID="82ca1e17-8bc2-4895-96bb-3c39e5863238" TYPE="ext4" PARTUUID="3276fc6f-02" /dev/xvdh: SEC_TYPE="msdos" LABEL="config-2" UUID="9796-932E" TYPE="vfat" /dev/xvdb1: LABEL="SWAP-xvdb1" UUID="d51fcca0-6b10-4934-a572-f3898dfd8840" TYPE="swap" PARTUUID="00025cdb-01" $ whoami root $ grep /var/lib/cloud/seed/config_drive /proc/mounts $ mount /var/lib/cloud/seed/config_drive $ echo $? 0 ## it exited 0 so it should be mounted, but it is not. $ ls /var/lib/cloud/seed/config_drive $ grep /var/lib/cloud/seed/config_drive /proc/mounts ## try somewhere else and with /dev/ path. it works. $ mount /dev/xvdh /mnt $ echo $? 0 $ grep /mnt /proc/mounts /dev/xvdh /mnt vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0 $ find /mnt/ /mnt/ /mnt/openstack /mnt/openstack/latest /mnt/openstack/latest/meta_data.json /mnt/openstack/latest/network_data.json /mnt/openstack/latest/user_data /mnt/openstack/latest/vendor_data.json $ journalctl -o short-monotonic --boot --no-pager | pastebinit http://paste.ubuntu.com/26119983/ ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: mount 2.27.1-6ubuntu3.3 ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90 Uname: Linux 4.4.0-98-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.12 Architecture: amd64 Date: Tue Dec 5 17:52:14 2017 ProcEnviron: TERM=screen PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: util-linux UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1736556/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp