Public bug reported:
When I installed Ubuntu 13.04 had my /home/marc encrypted and was able
to store large (~40G) files there.
Since upgrading to 13.10 it now *silently* truncates large files to 4G!
Below is a slighly edited session where a 1G file is created correctly,
but a 6G file only has 4G written and no errors are given. Notice dd
thinks it wrote 6.4G, but ls & df shows only 4G actually was.
This silent failure caused a 41G VM backing file to be truncated to 4G!
marc@hermes:~$ lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10
marc@hermes:~$ df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/sda7 360G 254G 88G 75% /home
/home/marc/.Private 360G 254G 88G 75% /home/marc
marc@hermes:~$ sudo time dd if=/dev/zero of=/home/marc/1.txt bs=1G count=1
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 27.2168 s, 39.5 MB/s
0.00user 4.27system 0:27.28elapsed 15%CPU (0avgtext+0avgdata
1049428maxresident)k
8inputs+2097880outputs (0major+262414minor)pagefaults 0swaps
marc@hermes:~$ ls -ls /home/marc/1.txt
1048588 -rw-r--r-- 1 root root 1073741824 Oct 25 11:33 /home/marc/1.txt
marc@hermes:~$ df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/sda7 360G 255G 87G 75% /home
/home/marc/.Private 360G 255G 87G 75% /home/marc
marc@hermes:~$ sudo time dd if=/dev/zero of=/home/marc/6.txt bs=1G count=6
6+0 records in
6+0 records out
6442450944 bytes (6.4 GB) copied, 188.545 s, 34.2 MB/s
0.00user 23.34system 3:08.66elapsed 12%CPU (0avgtext+0avgdata
1049428maxresident)k
56inputs+12589088outputs (1major+262412minor)pagefaults 0swaps
marc@hermes:~$ ls -ls /home/marc/6.txt
4194308 -rw-r--r-- 1 root root 6442450944 Oct 25 11:37 /home/marc/6.txt
marc@hermes:~$ df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/sda7 360G 259G 83G 76% /home
/home/marc/.Private 360G 259G 83G 76% /home/marc
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1244710
Title:
encryption on /home/$USER now silently truncates large files
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