linux-kernel - Re: WARNING: at drivers/gpu/drm/nouveau/core/core/mm.c:242

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Date:	Tue, 19 Feb 2013 08:07:44 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	bskeggs@...hat.com, dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>
Subject: Re: WARNING: at drivers/gpu/drm/nouveau/core/core/mm.c:242

On Tue, Feb 19, 2013 at 12:43:06AM +0100, Jiri Slaby wrote:
> On 02/19/2013 12:23 AM, Marcin Slusarz wrote:
> > On Mon, Feb 18, 2013 at 11:27:43AM +0100, Jiri Slaby wrote:
> >> Hi,
> >>
> >> we have a report of WARNING from 3.7.6 in nouveau at
> >> drivers/gpu/drm/nouveau/core/core/mm.c:242 here:
> >> https://bugzilla.novell.com/show_bug.cgi?id=802347#c11
> >>
> >> There is an order 4 allocation failure in nouveau_drm_open ->
> >> nouveau_vm_create, i.e. this one failed:
> >> vm->pgt  = kcalloc(vm->lpde - vm->fpde + 1, sizeof(*vm->pgt), GFP_KERNEL);
> >>
> >> Then, on the error path in still in nouveau_drm_open, it is followed by
> >> a call to nouveau_cli_destroy. But that one calls nouveau_vm_ref ->
> >> nouveau_mm_fini -> nouveau_vm_del -> nouveau_mm_fini which triggers the
> >> warning.
> >>
> >> Any ideas?
> > 
> > Crash/warning should be fixed by commit cfd376b6bfccf33782a0748a9c70f7f752f8b869
> > "drm/nouveau/vm: fix memory corruption when pgt allocation fails".
> 
> Oh, thanks for the pointer. Could that bug cause real "memory
> corruption"? As we're hunting one there...

Yes.

> Isn't this a stable-3.7 candidate?

Should have been :/.

> > Tomorrow I'll post a patch for page allocation failure.
> 
> What do you mean -- what kind of patch?

A patch which will change pgt allocation to use vmalloc.

Marcin
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