Package: util-linux Version: 2.25.1-3ubuntu4 Severity: normal According to manpage, mount $single_argument looks for that argument in /etc/fstab. However, when said argument is an existing mountpoint not listed in the fstab, mount still tries to perform something, apparently mount the same device over the same mountpoint. Usually that results in “device busy” error (a particularly funny one if special filesystems such as /sys/kernel/debug are involved), but not in case of tmpfs, where it just creates a new tmpfs and attaches it to the same directory, hiding existing files until the new tmpfs is unmounted.
For example, call mount /run and ls /run. Expected: an error because there’s no entry for /run in fstab. Actually: all files under /run disappear until umount /run is called. Apparently mount behaves as though the contents of /proc/mounts were appended to /etc/fstab. This is contrary to documentation and doesn’t sound like a good idea anyway. What are the reasons for such behavior? Also, even when a tmpfs entry is present in fstab, having mount create new tmpfs’es each time seems error-prone. Given that uses for attaching more than one FS to the same mountpoint are narrow, I suggest mount only do that if explicitly instructed by means of the two-argument form, otherwise decline to perform a duplicate mount. -- System Information: Debian Release: jessie/sid APT prefers utopic-updates APT policy: (500, 'utopic-updates'), (500, 'utopic-security'), (500, 'utopic') Architecture: i386 (i686) Kernel: Linux 3.16.0-25-generic (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages util-linux depends on: ii initscripts 2.88dsf-41ubuntu18 ii libblkid1 2.25.1-3ubuntu4 ii libc6 2.19-10ubuntu2 ii libmount1 2.25.1-3ubuntu4 ii libncurses5 5.9+20140712-2ubuntu1 ii libpam0g 1.1.8-3ubuntu4 ii libselinux1 2.3-1build1 ii libslang2 2.2.4-17ubuntu1 ii libsmartcols1 2.25.1-3ubuntu4 ii libtinfo5 5.9+20140712-2ubuntu1 ii libuuid1 2.25.1-3ubuntu4 ii lsb-base 4.1+Debian11ubuntu8 ii tzdata 2014i-0ubuntu0.14.10 ii zlib1g 1:1.2.8.dfsg-1ubuntu1 util-linux recommends no packages. Versions of packages util-linux suggests: ii dosfstools 3.0.26-3 ii kbd 1.15.5-1ubuntu1 ii util-linux-locales 2.25.1-3ubuntu4 -- debconf information excluded -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
