linux-kernel - Re: 2.6.22-rc2-mm1

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Message-ID: <Pine.LNX.4.64.0705231522060.22666@schroedinger.engr.sgi.com>
Date:	Wed, 23 May 2007 15:24:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc2-mm1

On Wed, 23 May 2007, Michal Piotrowski wrote:

> [   19.096577] Real Time Clock Driver v1.12ac
> [   21.650315] *** SLUB kmalloc-8: Redzone Active@...90f6d20 slab 0xc528c530
> [   21.657365]     offset=3360 flags=0x400000c3 inuse=61 freelist=0xc90f6d58
> [   21.664349]   Bytes b4 0xc90f6d10:  00 00 00 00 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ
> [   21.674305]     Object 0xc90f6d20:  31 30 31 39 2e 30 30 35                         1019.005        
> [   21.684259]    Redzone 0xc90f6d28:  00 cc cc cc                                     .ÿÿÿÿÿÿ            

Ok. We are writing a string of length 8 to an object allocated via 
kmalloc(8). A string of 8 bytes needs a 0x00 at the end though. This makes 
it 9 bytes. The kmalloc should have been for 9 bytes!