Hang and Panic kernel module for Test

hang_and_panic module causes a hang condition or a panic condition.
This module is assumed to be used for TESTING purposes.

Installation

Required packages for build

For Amazon Linux 2, need the following packages for build.

git
gcc
kernel-devel

build

Install required packages.

$ sudo yum -y install git gcc kernel-devel

Clone Git repository

$ git clone https://github.com/Noppy/HangAndPanicKernelModule.git
$ cd HangAndPanicKernelModule/

Build the kernel module.
Then a module with the file name is hang_panic.ko will be built.

$ make
$ ls *.ko
hang_panic.ko

Usage

Install the module

$ sudo insmod hang_panic.ko
$ lsmod |grep hang_panic

Read Help

# cat /proc/hang_panic 
<<Hang&Panic module>>
'echo c > /proc/hang_panic' >>> panic
'echo h > /proc/hang_panic' >>> hang(disable local irq and preempt)
'echo H > /proc/hang_panic' >>> hang(disable only local irq)

Cause Hang condition

(a)Lock preemption and currently core's LocalIRQ(Can not ping, probably).

# echo h > /proc/hang_panic

(b)Lock only currently core's LocalIRQ(Can ping)

# echo H > /proc/hang_panic

Cause Panic condition

This behavior is similar to echo c > /proc/sysrq-trigger.

# echo c > /proc/hang_panic

Remove the module

$ sudo rmmod hang_panic