This seems to be duplicate of 551968 (which was "fixed"^[] as of
3.6.19-2, somewhere before wheezy), so I guess this bug should be
merged/closed.
<rant>
^[] which annoyed me to no end, as this option provides only snake oil
privacy [(1) it is useless on SSD; (2) it does nothing about leaking
data in swap and temporary files; (3) and it is useless on
(fully-)journaling, deduplicating or compressing FS, as they are likely
to relocate zeroed-out blocks instead of rewriting physical storage] -
so if you /really/ care about [offline] safety of your data, you
should've beeh used full disk encryption; and by then, this option is
just useless waste of cpu cycles and I/O bandwidth.
Besides, as this option is available as runtime tuneable `pragma
secure_delete`, there are no good reason to twiddle it system-wide.
</>
