linux-kernel - Re: [Bug #13112] Oops in drain

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Date:	Mon, 27 Apr 2009 13:36:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Bart <mmx@....pl>
cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [Bug #13112] Oops in drain_array

On Mon, 27 Apr 2009, Bart wrote:

> After turning the suggested debuging options I've got tons of these when
> trying to stress the tape device like before:
> 
> Apr 27 16:57:30 fs kernel: [   96.446708] slab error in verify_redzone_free():
> cache `size-128': memory outside object was overwritten
> Apr 27 16:57:30 fs kernel: [   96.446713] Pid: 0, comm: swapper Not tainted
> 2.6.29.1-64 #2
> Apr 27 16:57:30 fs kernel: [   96.446715] Call Trace:
> Apr 27 16:57:30 fs kernel: [   96.446717]  <IRQ>  [<ffffffff8029adc5>]
> __slab_error+0x1f/0x25
> Apr 27 16:57:30 fs kernel: [   96.446728]  [<ffffffff8029b24b>]
> cache_free_debugcheck+0x108/0x1d6
> Apr 27 16:57:30 fs kernel: [   96.446731]  [<ffffffff8029b473>]
> kfree+0x81/0xc2
> Apr 27 16:57:30 fs kernel: [   96.446735]  [<ffffffff802bd311>]
> bio_free_map_data+0xc/0x1e

This appears to be kfree(bmd->iovecs) in bio_free_map_data().  It looks 
like the memcpy size in bio_set_map_data() overrides the kmalloc size; in 
other words, for a redzone error, bio->bi_vcnt > nr_pages in 
bio_copy_user_iov().
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