linux-kernel - Re: [BUG] BUG: kernel NULL pointer dereference at ttm_device

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Date: Tue, 23 Jan 2024 10:43:04 +0100
From: Christian König <christian.koenig@....com>
To: Steven Rostedt <rostedt@...dmis.org>, Dave Airlie <airlied@...il.com>
Cc: "Bhardwaj, Rajneesh" <rajneesh.bhardwaj@....com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 LKML <linux-kernel@...r.kernel.org>, Felix Kuehling
 <Felix.Kuehling@....com>, dri-devel@...ts.freedesktop.org,
 Fedor Pchelkin <pchelkin@...ras.ru>
Subject: Re: [BUG] BUG: kernel NULL pointer dereference at
 ttm_device_init+0xb4

Am 23.01.24 um 03:52 schrieb Steven Rostedt:
> On Tue, 23 Jan 2024 12:32:39 +1000
> Dave Airlie <airlied@...il.com> wrote:
>
>> On Tue, 23 Jan 2024 at 12:21, Dave Airlie <airlied@...il.com> wrote:
>>> On Tue, 23 Jan 2024 at 12:15, Steven Rostedt <rostedt@...dmis.org> wrote:
>>>> On Mon, 22 Jan 2024 19:56:08 -0500
>>>> "Bhardwaj, Rajneesh" <rajneesh.bhardwaj@....com> wrote:
>>>>   
>>>>> On 1/22/2024 7:43 PM, Linus Torvalds wrote:
>>>>>> On Mon, 22 Jan 2024 at 15:17, Steven Rostedt<rostedt@...dmis.org>  wrote:
>>>>>>> Perhaps this is the real fix?
>>>>>> If you send a signed-off version, I'll apply it asap.
>>>>>
>>>>> I think a fix might already be in flight. Please see Linux-Kernel
>>>>> Archive: Re: [PATCH] drm/ttm: fix ttm pool initialization for
>>>>> no-dma-device drivers (iu.edu)
>>>>> <https://lkml.iu.edu/hypermail/linux/kernel/2401.1/06778.html>
>>>> Please use lore links. They are much easier to follow and use.
>>> https://lore.kernel.org/dri-devel/20240123022015.1288588-1-airlied@gmail.com/T/#u
>>>
>>> should also fix it, Linus please apply it directly if Steven has a
>>> chance to give it a run.
>> I see Linus applied the other one, that's fine too.
>>
> They don't look mutually exclusive. I can test the other one as well.

While applying the fix a week ago I was under the impression that QXL 
doesn't use a device structure because it doesn't have one and so can't 
give anything meaningful for this parameter.

If QXL does have a device structure and can provide it I would rather 
like to go down this route and make the device and with it the numa node 
mandatory for drivers to specify.

Regards,
Christian.

>
> -- Steve