backport-iwlwifi-dkms causes kernel panic

[chewy]

Yesterday I upgrade and apt installed backport-iwlwifi-dkms on my machine.
I received a notification telling me I could select a different driver or something. This opened "driver manager" (in kde) and I was able to select iwlwifi-something. I followed hint, but not really knowing what this would. I assumed it was a driver specific to my wifi card that would replace the default.
I was able to continue working but upon reboot, when I logged in, after a few seconde (when my system tried connecting to wifi) everything froze and I was only able to do a hard reboot.

After a few failed attempts to reboot and login normally, I switched to tty2, logged in, and tried to connect to wifi using nmcli. At the end of a long output, "kernel panic" was printed to my console before freeze.

When booting (with grub) to previous kernel version everything worked fine, and when I purged backport-iwlwifi-dkms from current kernel version it also worked. Everything now seems fine now that I have removed this package.

I am using ubuntu 19.10 with kde (kubuntu) with kernel version 5.3.0-24-generic
This is my first bug report so I hope this is the right place to report this, sorry if it isn't!

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[obix (e-chomas-g)]

Same here under Xubuntu 19.10 with Kernel 5.3.0-24-generic: System freezes when showing lightdm's login screen. When using recovery boot mode and choosing "network - activate network" a "kernel panic - not syncing: Fatal exception in interrupt" is shown.

With Kernel 5.3.0-23-generic everything is working fine.

[You-Sheng Yang (vicamo)]

Thanks for reporting. This issue duplicates bug 1855825, and has fix released as version 8042-0ubuntu2 on Focal, and we're working on SRU the fix to Eoan.