From owner-freebsd-stable@freebsd.org  Wed Feb  1 13:18:32 2017
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Date: Wed, 1 Feb 2017 15:18:26 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Jakub Lach <jakub_lach@mailplus.pl>
Cc: freebsd-stable@freebsd.org
Subject: Re: FreeBSD 11.0-STABLE #0 r310265 amd64 seems to be cpi-ing garbage
 to mounted FAT32 fs after 10-20 GB.
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On Wed, Feb 01, 2017 at 06:02:45AM -0700, Jakub Lach wrote:
> Yes, it has happened also with another device. Which was not a card reader
> (HDD 
> mounted by USB), and I have used the same card reader configuration to copy 
> the memory card content with iMac.

Is your card reader USB-attached, same as the HDD you mentioned ?

Test with UFS filesystem put onto a card or HDD, does system read garbage
or panics due to metadata inconsistency, under the load ?