[Bug 288881] ZFS checksum error at `software' level

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288881

--- Comment #3 from dirkx@webweaving.org ---
We've only seen it in that exact same place and with that exact length. Never
in any tother location.

I've tried to dd the entire disk (dd if=/dev/ada0 or ada0p3 of/dev/null) anmd

     dd if=/dev/ada0p3 skip=`expr 1793168560128 / 512` bs=512 count=1024
of=/dev/null

to trigger it (but am not sure if above calculation/mapping is right). Sofar
not managed to trigger it.

Is there a way to get ZFS reveal what file is at that location ? 

Given that it always triggers around 10 to the hour I suspect it is some
crontab on something in baseline FreeBSD OS itself (as the production side is
all encrypted ZFS with very regular checkpointing/rollbacks and lots of change
-- whereas the location is always that `offset=1793168560128 size=32768'.

Also - if we ignore the error for months - it does not change/get worse.

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