linux-kernel - Re: 4.0.0-rc4: panic in free

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Message-Id: <20150322.195403.1653355516554747742.davem@davemloft.net>
Date:	Sun, 22 Mar 2015 19:54:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	david.ahern@...cle.com
Cc:	torvalds@...ux-foundation.org, sparclinux@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, bpicco@...oft.net
Subject: Re: 4.0.0-rc4: panic in free_block

From: David Ahern <david.ahern@...cle.com>
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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