[Bug 1318268] [NEW] df says / out of space but isn't

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when I do a df, I get:/$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 20G 19G 4.6M 100% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 1.8G 12K 1.8G 1% /dev
tmpfs 356M 904K 355M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1.8G 80K 1.8G 1% /run/shm
none 100M 12K 100M 1% /run/user
/dev/sda1 80G 12G 65G 16% /home

but according to

/$ sudo du -hc --max-depth=1
12G ./home
15M ./etc
8.0K ./media
1.4G ./var
9.1M ./bin
153M ./boot
12K ./dev
666M ./lib
4.0K ./lib64
0 ./mnt
0 ./opt
du: cannot access ‘./proc/23086/task/23086/fd/4’: No such file or directory
du: cannot access ‘./proc/23086/task/23086/fdinfo/4’: No such file or directory
du: cannot access ‘./proc/23086/fd/4’: No such file or directory
du: cannot access ‘./proc/23086/fdinfo/4’: No such file or directory
0 ./proc
352K ./root
1000K ./run
13M ./sbin
0 ./selinux
0 ./srv
0 ./sys
4.0K ./tmp
4.0G ./usr
0 ./cdrom
4.0K ./.config
18G .
18G total

says that nothing in / could be taking that much space, so a bug

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
 df says / out of space but isn't
https://bugs.launchpad.net/bugs/1318268
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