Null pointer dereference regression introduced by 326e1c208f3f24d14b93f910b8ae32c94923d22c

Null pointer deref

after reverting 326e1c208f3f24d14b93f910b8ae32c94923d22c the problem is gone and the kernel does not crash anymore

See this discussion for details:

https://bbs.archlinux.org/viewtopic.php?pid=2102715#p2102715

Hi,

I am running arch successfully since a couple of years on my Acer ConceptD 7 laptop. Since a kernel update on 24th of May I am having strange issues (never seen this before):

- sometimes I cannot even login (using gdm) - after entering password just a blank screen
- if I can login I can start working - after a while commands I enter in the console are accepted but do nothing (i.e. grub-mkconfig -o ..... can enter the command but just no output - it does nothing - happens with most other command then as well....)
- Reboot does not work - stuck somewhere - have to switch the machine off the hard way
- this happens even when entering runlevel 3 (so no window manager)
- same happens on the laptop of a friend (exact same model) - unfortunately I have no other piece of hardware which I could use for testing to potentially reproduce the problem

Managed to trace this down to all kernels after 6.3.3.arch1-1 - so 6.3.3.arch1-1 it the last one which works without any problems Same applies for the LTS kernels - not 100% sure but think 6.1.29 ist the last one which works

Currently I have marked linux linux-headers and nvidia to not upgrade. LTS kernels are upgraded but the latest two kernels (latest from today) up until 6.1.31-1 do NOT work

Problem: Since most of the command fail when using one of the latest kernel - it is almost impossible to debug - at least I am not knowledgable enough to know where to look.