more information, 1. on ubuntu14.04.4, after this panic reproduced, all the 4.4.x kernel will get panic when cat /sys/module/apparmor/parameters/audit 2. on ubuntu14.04.5, it is fine with all 4.4.x kernels.
more information, apparmor/ parameters/ audit
1. on ubuntu14.04.4, after this panic reproduced, all the 4.4.x kernel will get panic when cat /sys/module/
2. on ubuntu14.04.5, it is fine with all 4.4.x kernels.