Public bug reported:
After a patching and a reboot cycle (possibly only the ones that involve
running ureadahead triggers) a leftover mount entry is present in
/etc/mtab pointing to /var/lib/ureadahead/debugfs/tracing
root@localhost:~$ mount
/dev/mapper/sysvg-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
tracefs on /var/lib/ureadahead/debugfs/tracing type tracefs (rw,relatime)
/dev/sda1 on /boot type ext4 (rw)
systemd on /sys/fs/cgroup/systemd type cgroup
(rw,noexec,nosuid,nodev,none,name=systemd)
root@localhost:~$ mount | grep tracefs
tracefs on /var/lib/ureadahead/debugfs/tracing type tracefs (rw,relatime)
But that mount point doesn't exist
root@localhost:~$ ls -lha /var/lib/ureadahead/debugfs/
total 8.0K
drwxr-xr-x 2 root root 4.0K Jan 27 11:36 .
drwxr-xr-x 3 root root 4.0K Jan 27 11:16 ..
That mtab entry can be removed by running 'umount
/var/lib/ureadahead/debugfs/tracing', but only after creating that mount
point first
root@localhost:~$ mkdir /var/lib/ureadahead/debugfs/tracing
root@localhost:~$ ls -lh /var/lib/ureadahead/debugfs/
total 4.0K
drwxr-xr-x 2 root root 4.0K Jan 27 11:28 tracing
root@localhost:~$ umount /var/lib/ureadahead/debugfs/tracing
umount: /var/lib/ureadahead/debugfs/tracing: not mounted
root@localhost:~$ mount | grep tracefs
root@localhost:~$ mount
/dev/mapper/sysvg-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
/dev/sda1 on /boot type ext4 (rw)
systemd on /sys/fs/cgroup/systemd type cgroup
(rw,noexec,nosuid,nodev,none,name=systemd)
I'm experiencing this on several Ubuntu 14.04 servers, running on a VMware
cluster.
Package versions worth noting are:
ureadahead 0.100.0-16
linux-image-4.4.0-59-generic4.4.0-59.80~14.04.1
open-vm-tools 2:9.4.0-1280544-5ubuntu6.2
This also causes #1516451 and may be related to #499773
** Affects: ureadahead (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1659684
Title:
Leftover mount in /etc/mtab pointing to
/var/lib/ureadahead/debugfs/tracing after some runs of apt dist-
upgrade followed by a reboot
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