Kernel Crash Dump

sudo apt install linux-crashdump

Verification
cat /proc/cmdline
dmesg | grep -i crash
kdump-config show

cat /proc/sys/kernel/sysrq

Active kdump
kdump-config load

Enabling various types of panics
To make Linux kernel to panic on different situations please use:

echo 1 > /proc/sys/kernel/hung_task_panic          # panic when hung task is detected
echo 1 > /proc/sys/kernel/panic_on_io_nmi          # panic on NMIs from I/O
echo 1 > /proc/sys/kernel/panic_on_oops            # panic on oops or kernel bug detection
echo 1 > /proc/sys/kernel/panic_on_unrecovered_nmi # panic on NMIs from memory or unknown
echo 1 > /proc/sys/kernel/softlockup_panic         # panic when soft lockups are detected
echo 1 > /proc/sys/vm/panic_on_oom                 # panic when out-of-memory happens

Test Crash kernel
sudo -s
echo c > /proc/sysrq-trigger

Get vmlinux with debug symbol
sudo tee /etc/apt/sources.list.d/ddebs.list << EOF
deb http://ddebs.ubuntu.com/ $(lsb_release -cs)          main restricted universe multiverse
deb http://ddebs.ubuntu.com/ $(lsb_release -cs)-security main restricted universe multiverse
deb http://ddebs.ubuntu.com/ $(lsb_release -cs)-updates  main restricted universe multiverse
deb http://ddebs.ubuntu.com/ $(lsb_release -cs)-proposed main restricted universe multiverse
EOF

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ECDCAD72428D7C01
sudo apt-get update
sudo apt-get install linux-image-$(uname -r)-dbgsym

Inspecting the crash dump using crash

Debug kernel: /usr/lib/debug/boot/
Crash dump: /var/crash/

crash <debug kernel> <crash dump>


Kernel/CrashdumpRecipe - Ubuntu Wikihttps://wiki.ubuntu.com/Kernel/CrashdumpRecipe

Kernel Crash Dump
https://help.ubuntu.com/lts/serverguide/kernel-crash-dump.html