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@suse.de>

quoted

quoted

quoted

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

quoted

Does it work if you revert one of these commits?

quoted

   c2fe0480cd77 ("fbdev/efifb: Use devm_register_framebuffer()")

Reverting this commit fixes the issue.

Good.

quoted

For the latter, there might be a fix at

quoted

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