gautammenghani

NOTE: Run all below steps as root

1. Get phoronix test suite

# git clone https://github.com/phoronix-test-suite/phoronix-test-suite.git

2. Install dependencies

# dnf install -y libicu libicu-devel pkgconf-pkg-config php-cli php-xml php-json unzip

gautammenghani

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

gautammenghani

IMAGE="/home/gautam/fun/linux/programming/image" qemu-system-x86_64
-m 4G
-smp 2
-kernel /opt/linux/arch/x86/boot/bzImage
-append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0 kasan.fault=report"
-drive file=$IMAGE/buster.img,format=raw
-net user,hostfwd=tcp::10021-:22 -net nic
-enable-kvm
-usb -device qemu-xhci,id=xhci -device usb-host,hostdevice=/dev/bus/usb/001/003 -nographic -pidfile vm.pid 2>&1 | tee vm.log

gautammenghani

1. https://blog.cloudflare.com/the-tale-of-a-single-register-value/
2. https://blog.twitter.com/engineering/en_us/topics/open-source/2020/hunting-a-linux-kernel-bug
3. http://www.vegardno.net/2016/08/sync-debug.html
4. https://www.desmondcheong.com/blog/2021/06/02/decoding-stack-traces-in-the-linux-kernel/
5. https://www.datastax.com/blog/how-we-tracked-down-linux-kernel-bug-fallout
6. https://engineering.skroutz.gr/blog/uncovering-a-24-year-old-bug-in-the-linux-kernel/
7. https://netflixtechblog.com/debugging-a-fuse-deadlock-in-the-linux-kernel-c75cd7989b6d

gautammenghani

While learning about the kernel, I have come across various resources apart from main documentation.

1. LDD3 book : https://lwn.net/Kernel/LDD3/
2. Linux kernel development book (3rd edition)
3. LKMPG : https://tldp.org/LDP/lkmpg/2.6/html/lkmpg.html#AEN121
4. LKMPG latest version : https://github.com/sysprog21/lkmpg

gautammenghani

oops.c

#include <linux/kernel.h> #include <linux/module.h>

MODULE_LICENSE("GPL"); static int test_panic_init(void) { printk(KERN_INFO"%s: In init\n", func); panic("Hello Kernel I am causing the panic\n"); return 0;

gautammenghani

1. Clone the stable kernel git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

2. Create a new branch and make changes in that branch. Commit your changes.

3. Create a config file for your distro, and then compile and install your kernel to make sure everything works.

4. To submit your changes, you need to make a patch out of your commit. Each subsystem of the kernel has its own maintainer(s). To find out the maintainer for your subsystem, you can use the 'get_maintainer.pl' script bundled with the kernel.

5. To get your patch ready, use the following command. After a patch is generated, you need to add details to it explaining why changes are required. git format-patch -1 --to= --to= --cc= --cc=