Re: WARNING: CPU: 0 PID: 8 at drivers/video/fbdev/core/fbmem.c:467 unregister_framebuffer+0x45/0x160

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On 9/3/24 11:56, V, Narasimhan wrote:
[AMD Official Use Only - AMD Internal Distribution Only]

Hi,


________________________________________
From: Helge Deller <deller@xxxxxx>
Sent: Tuesday, September 3, 2024 01:48 AM
To: V, Narasimhan; Thomas Zimmermann
Cc: Linux Next Mailing List; Daniel Vetter; linux-fbdev@xxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; open list; linux@xxxxxxxxxxxxxx; 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@xxxxxxx>
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.

Great.
Thanks for testing!

Helge





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