linux-kernel - Re: WARNING: CPU: 0 PID: 8 at drivers/video/fbdev/core/fbmem.c:467 unregister

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Message-ID:
 <DM4PR12MB50864B3F2396760358F2955589932@DM4PR12MB5086.namprd12.prod.outlook.com>
Date: Tue, 3 Sep 2024 09:56:34 +0000
From: "V, Narasimhan" <Narasimhan.V@....com>
To: Helge Deller <deller@....de>
CC: Linux Next Mailing List <linux-next@...r.kernel.org>, Daniel Vetter
	<daniel@...ll.ch>, "linux-fbdev@...r.kernel.org"
	<linux-fbdev@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, open list <linux-kernel@...r.kernel.org>,
	"linux@...ssschuh.net" <linux@...ssschuh.net>, Borislav Petkov
	<bp@...en8.de>, Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: WARNING: CPU: 0 PID: 8 at drivers/video/fbdev/core/fbmem.c:467
 unregister_framebuffer+0x45/0x160

[AMD Official Use Only - AMD Internal Distribution Only]

Hi,


________________________________________
From: Helge Deller <deller@....de>
Sent: Tuesday, September 3, 2024 01:48 AM
To: V, Narasimhan; Thomas Zimmermann
Cc: Linux Next Mailing List; Daniel Vetter; linux-fbdev@...r.kernel.org; dri-devel@...ts.freedesktop.org; open list; linux@...ssschuh.net; Borislav Petkov
Subject: Re: WARNING: CPU: 0 PID: 8 at drivers/video/fbdev/core/fbmem.c:467 unregister_framebuffer+0x45/0x160

>On 9/2/24 20:56, V, Narasimhan wrote:
>> From: Thomas Zimmermann <tzimmermann@...e.de>
>>>>> Seeing the following warning and bug on boot with linux-next-20240829
>>>>>
>>>>> WARNING: CPU: 0 PID: 8 at drivers/video/fbdev/core/fbmem.c:467 unregister_framebuffer+0x45/0x160
>>>>> BUG: kernel NULL pointer dereference, address: 0000000000000000
>>
>>> Does it work if you revert one of these commits?
>>
>>>    c2fe0480cd77 ("fbdev/efifb: Use devm_register_framebuffer()")
>>
>>
>> Reverting this commit fixes the issue.

> Good.

>>> For the latter, there might be a fix at
>>
>>> https://patchwork.freedesktop.org/patch/611902/?series=138008&rev=1

> Current fbdev git tree and for-next series have this newer patch already.
> I expect that the issue is already resolved with there, but it would
> be good if you could test.

> Helge

The patch seems to be already into linux-next tree and the issue is no more seen with today's linux-next build.

--
Regards
Narasimhan V