From: David Ahern <david.ahern@xxxxxxxxxx>
Date: Sun, 22 Mar 2015 17:35:49 -0600
> I don't know if you caught Bob's message; he has a hack to bypass
> memcpy and memmove in mm/slab.c use a for loop to move entries. With
> the hack he is not seeing the problem.
>
> This is the hack:
>
> +static void move_entries(void *dest, void *src, int nr)
> +{
> + unsigned long *dp = dest;
> + unsigned long *sp = src;
> +
> + for (; nr; nr--, dp++, sp++)
> + *dp = *sp;
> +}
> +
>
> and then replace the mempy and memmove calls in transfer_objects,
> cache_flusharray and drain_array to use move_entries.
>
> I just put it on 4.0.0-rc4 and ditto -- problem goes away, so it
> clearly suggests the memcpy or memmove are the root cause.
Thanks, didn't notice that.
So, something is amuck.
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