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Date: Tue, 19 Feb 2013 00:23:35 +0100
From: Marcin Slusarz <marcin.slusarz@gmail.com>
To: Jiri Slaby <jslaby@suse.cz>
Cc: bskeggs@redhat.com, dri-devel@lists.freedesktop.org,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: WARNING: at drivers/gpu/drm/nouveau/core/core/mm.c:242
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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".

Tomorrow I'll post a patch for page allocation failure.


Marcin