imx6 silent memory corruption

[Nikolay Dimitrov <picmaster@mail.bg>]

Hi folks,

I observe a behavior of my system, which I think is a silent memory
corruption. My setup is imx6d, 3.10.17-1.0.0ga, daisy. Here's a simple
script that usually should not fail:


set -e

for i in `seq 1 100`; do
     echo "Test $i"
     sha256sum -c test.dat.sha256
done


test.dat contains 64MB random data, test.dat.sha256 contains the SHA256
file hash.

The files are copied in /tmp and test is run there, to avoid unwanted
interactions with most of the filesystem drivers and storage devices.
What actually happens is that sooner or later the hash verification
fails, which should not happen (and doesn't happen on my x64
workstation). During the verification failure there are no errors in
the system log.

Performed also a similar test where I compared in a loop the content of
2 copies of the same file, and again after some iterations the
comparison fails, neither with system log errors, nor oopses.

I will appreciate if you can share ideas what could be wrong with this
setup, and also I'll be happy to hear from you suggestions for similar
simple tests for system reliability.

Regards,
Nikolay