something's using space, can't figure out what - how to debug?

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Here is one of my ext4 filesystems, which uses 2x more space as it
should:

# df -h /srv
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvdf             194G  134G   51G  73% /srv

# du -sh /srv/
60G     /srv/

# lsof -n|grep /srv
# 


So df says 134 GB is used, while du says 60 GB is used.
No removed but used files, according to lsof.

How do I best debug what happened to ~70 GB?

This is EC2 kernel, nothing interesting in dmesg:

# uname -a
Linux ec2.agenteimovel.com.br 3.0.0-12-virtual #20-Ubuntu SMP Fri Oct 7
18:19:02 UTC 2011 x86_64 GNU/Linux


-- 
Tomasz Chmielewski
http://www.ptraveler.com
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