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linux - df -h shows 100% usage but sizes don't add up

I have a situation where my root filesystem is supposed to have plenty of free space, but Debian behaves as if it had no free space left. Non-root users even refute to write anything complaining about the lack of free space. I.e. for example:



~$ echo "qwertyu" > test
-bash: echo: write error: Spazio esaurito sul device


(Sorry about the language, I didn't install the server myself. The error reads "ran out of free space on the device").
But root writes to the same directory without complaints. Also if I do df -h as root I get this:



/# df -h

File system                                             Dim. Usati Dispon. Uso% Montato su
rootfs                                                   48G   46G       0 100% /
udev                                                     10M     0     10M   0% /dev
tmpfs                                                   397M   88M    310M  23% /run
/dev/disk/by-uuid/8063903c-80ad-4f72-81b0-cd67dbd48fc7   48G   46G       0 100% /
tmpfs                                                   2,0G     0    2,0G   0% /dev/shm
tmpfs                                                   2,0G     0    2,0G   0% /sys/fs/cgroup
tmpfs                                                   5,0M     0    5,0M   0% /run/lock
tmpfs                                                   100M     0    100M   0% /run/user
/dev/sdb1                                                99G  9,6G     84G  11% /disk2



But du entries don't add up:



/# du -sh /* | sort -hr
du: impossibile accedere a "/proc/12905/task/12905/fd/4": File o directory non esistente
du: impossibile accedere a "/proc/12905/task/12905/fdinfo/4": File o directory non esistente
du: impossibile accedere a "/proc/12905/fd/4": File o directory non esistente
du: impossibile accedere a "/proc/12905/fdinfo/4": File o directory non esistente
9,4G    /disk2

3,8G    /var
3,2G    /data
1,6G    /usr
277M    /opt
130M    /root
129M    /lib
88M /run
45M /home
18M /boot
7,6M    /bin

6,0M    /sbin
5,2M    /etc
28K /tmp
16K /lost+found
8,0K    /media
4,0K    /srv
4,0K    /selinux
4,0K    /mnt
4,0K    /lib64
0   /vmlinuz

0   /sys
0   /proc
0   /initrd.img
0   /dev


(Error says "Cannot access yada yada: No such file or directory").
Be aware that /disk2 is a mount for an another partition.



Checking the filesystem didn't help either:




/# e2fsck -n /dev/sda1
e2fsck 1.42.5 (29-Jul-2012)
Warning!  /dev/sda1 is mounted.
Attenzione: essendo un controllo a sola lettura, il journal non verrà ripristinato.
/dev/sda1: clean, 86568/3145728 files, 11666588/12563712 blocks


("Being it a read-only check, the journal will not be recovered", but I guess the "clean" just below rules out this possibility).




Any idea what might be going on here? Consider the system runs on a VM somewhere and I can only access it via SSH.

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