Getting this in fresh install of maverick 10.10, fully updated.
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/shim-root
230343852 107685244 110957772 50% /
none 4034012 340 4033672 1% /dev
none 4044064 47660 3996404 2% /dev/shm
none 4044064 752 4043312 1% /var/run
none 4044064 0 4044064 0% /var/lock
none 230343852 107685244 110957772 50%
/var/lib/ureadahead/debugfs
/dev/sda1 233191 75352 145398 35% /boot
$ cat /proc/self/mountinfo
14 19 0:14 / /sys rw,nosuid,nodev,noexec,relatime - sysfs none rw
15 19 0:3 / /proc rw,nosuid,nodev,noexec,relatime - proc none rw
16 19 0:5 / /dev rw,relatime - devtmpfs none
rw,size=4034012k,nr_inodes=1008503,mode=755
17 16 0:11 / /dev/pts rw,nosuid,noexec,relatime - devpts none
rw,gid=5,mode=620,ptmxmode=000
18 14 0:15 / /sys/fs/fuse/connections rw,relatime - fusectl fusectl rw
19 1 252:1 / / rw,relatime - ext4 /dev/mapper/shim-root
rw,errors=remount-ro,user_xattr,barrier=1,data=ordered
21 14 0:7 / /sys/kernel/debug rw,relatime - debugfs none rw
22 14 0:10 / /sys/kernel/security rw,relatime - securityfs none rw
23 16 0:16 / /dev/shm rw,nosuid,nodev,relatime - tmpfs none rw
24 19 0:17 / /var/run rw,nosuid,relatime - tmpfs none rw,mode=755
25 19 0:18 / /var/lock rw,nosuid,nodev,noexec,relatime - tmpfs none rw
26 19 8:1 / /boot rw,relatime - ext2 /dev/sda1 rw,errors=continue
27 15 0:19 / /proc/sys/fs/binfmt_misc rw,nosuid,nodev,noexec,relatime -
binfmt_misc binfmt_misc rw
20 19 0:20 / /home/aaron/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon
gvfs-fuse-daemon rw,user_id=1000,group_id=1000
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https://bugs.launchpad.net/bugs/499773
Title:
Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears
in /etc/mtab
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