linux-kernel - Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443 kmem_cache_destroy, scsi_put_host_cmd

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Date:	Tue, 22 Apr 2008 15:10:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443
	kmem_cache_destroy, scsi_put_host_cmd_pool()


* James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> Thanks ... it looks like we may have trouble from devices that alter 
> the unchecked isa dma flag after scsi_host_alloc.  The guilty parties 
> appear to be gdth, eata, u14-34f, ultrastor, BusLogic and advansys.
> 
> The trouble is that if you alloc the host with it one way and free it 
> with it the other, the wrong freelist is used and the ref counts are 
> invalid.
> 
> Try this pseudo fix: it avoids allocating the freelist until add time 
> (by which time they should all have fixed the flag).  It still doesn't 
> change the fact that the host is allocated in the wrong region, but 
> that shouldn't matter too much.

ok - do you intend to push this pseudo-fix upstream? If yes then please 
consider it fixed as far as i'm concerned - i'll re-reply if the warning 
resurfaces (it wasnt lethal to the bootup otherwise). Or if you've got 
some other approach/fix then i can test that too.

	Ingo
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