[apparmor] Bug#885775: apparmor: Apparmor triggers NULL pointer dereference in kernel 4.14.7-1 when updating with aptitude

[intrigeri]

Control: forwarded -1 apparmor at lists.ubuntu.com

Hi AppArmor kernel developers,

we got this bug reported in Debian:

Kertesz Laszlo:
>    * What led up to the situation?
> 	Installed kernel 4.14 in Debian Testing and ever since at every upgrade where systemd or other important 
> 	packages were upgraded the system froze with the last 2 lines in the system log:

> 	Dec 29 21:25:26 laca-desktop kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000005
> 	Dec 29 21:25:26 laca-desktop kernel: IP: __task_pid_nr_ns+0xc7/0xf0

> 	The system became unresponsive, not even the sysrq combinations were working
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
> 	Restarted ran dpkg --configure -a and every time the system froze
> 	Booting with the 4.13 kernel was fine, dpkg finished its run

> 	At the next upgrade i still got the freeze, after reboot i disabled the kernel security features with the kernel command line security=false

>    * What was the outcome of this action?
> 	dpkg was working fine with the kernel 4.14 too

Do you need more info from me or from the bug reporter (Kertesz
Laszlo, Cc'ed)?

Cheers,
-- 
intrigeri