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#1 2016-10-24 09:05:20

marius-arc
Member
Registered: 2016-04-17
Posts: 42

[SOLVED] Unable to handle kernel NULL pointer - can't boot/login

Yesterday I ran pacman -Syu before logging off, and today I can't log in anymore. I'm getting a lot of spam at the login prompt, and if I try to log in it just hangs.
I made a bootable USB and chroot'ed to try to run pacman again in case there was a bad package published or something. But no luck, still the same issue.
My journalctl is also empty after chroot'ing so I don't have any logs to show. I took a video so I could pause to see the messages, but the first and only one that sticks out for me is:

BUG: unable to handle kernel NULL pointer

Here is the video if anyone would like to take a look:
https://youtu.be/Zj5I2gAnbJw

Any tips on how to start fixing this?

Last edited by marius-arc (2016-10-24 10:17:17)

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#2 2016-10-24 09:28:40

seth
Member
Registered: 2012-09-03
Posts: 49,996

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

looks like related to the wifi kernel module, broadcom.
maybe https://bbs.archlinux.org/viewtopic.php?id=146008
figure the kernel module from the live system and blacklist it in the chrooted system.

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#3 2016-10-24 09:31:18

marius-arc
Member
Registered: 2016-04-17
Posts: 42

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

Thanks I will try that!

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#4 2016-10-24 09:52:23

marius-arc
Member
Registered: 2016-04-17
Posts: 42

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

No luck, here is what I tried.

Made a .conf file in /etc/modprobe.d/ containing "blacklist broadcom-wl"
Reboot, same issue.
Added "blacklist broadcom-wl-dkms" in the same file on a new line.
Reboot, same issue.
Edited /etc/mkinitcpio.conf and added /etc/modprobe.d/myfile.conf to the FILES section.
Ran mkinitcpio -p linux.
Reboot, same issue.

Last edited by marius-arc (2016-10-24 09:59:12)

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#5 2016-10-24 10:17:02

marius-arc
Member
Registered: 2016-04-17
Posts: 42

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

I completely removed broadcom-wl-dkms and all is well again.

Last edited by marius-arc (2016-10-24 10:17:29)

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#6 2016-10-24 10:19:27

seth
Member
Registered: 2012-09-03
Posts: 49,996

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

Why and how did you have both installed? They're conflicting.

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#7 2016-10-24 10:55:36

marius-arc
Member
Registered: 2016-04-17
Posts: 42

Re: [SOLVED] Unable to handle kernel NULL pointer - can't boot/login

seth wrote:

Why and how did you have both installed? They're conflicting.

I didn't. I had just forgotten that I had the DKMS one.

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