memory problem

[Azuki]

Using Kos for dev an error occured :

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.
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post-magic is wrong at index 6 (29d4ca6c)
DAMAGED BLOCK DURING FREE
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Well, what means
"'magic' is not correct! 015e0000"
and is the
"DAMAGED BLOCK DURING FREE"
an hardware error saying DC memory is diying ?

is ther a way to check the DC ram quality ?

thanks for help :)