#!/bin/bash
# maravento.com
#
################################################################################
#
# Kworker Kill
#
################################################################################

set -uo pipefail

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

# root check
if [ "$(id -u)" != "0" ]; then
    echo "ERROR: This script must be run as root -- abort"
    exit 1
fi

# prevent overlapping runs
SCRIPT_LOCK="/var/lock/$(basename "$0" .sh).lock"
(umask 077; : >> "$SCRIPT_LOCK")
exec 200>"$SCRIPT_LOCK"
if ! flock -n 200; then
    echo "ERROR: script $(basename "$0") is already running -- abort"
    exit 1
fi

# dependencies
for dep in grep coreutils util-linux; do
    if ! dpkg -s "$dep" &>/dev/null; then
        echo "ERROR: dependency '$dep' is not installed -- abort" >&2
        exit 1
    fi
done

echo "Kworker Kill Starting. Wait..."

kworker=$(mktemp /tmp/gpelist.XXXXXX)
trap 'rm -f "$kworker"' EXIT

echo "Check GPE list..."
grep enabled /sys/firmware/acpi/interrupts/* 2>/dev/null > "$kworker"

gpe=$(grep -E '[1-9][0-9][0-9][0-9]+ ' "$kworker" | sort -rnk 2 | head -n1 | cut -d":" -f1)
# Pattern matches GPE interrupt counts >= 1000, indicating a potential IRQ storm

if [ -z "$gpe" ]; then
    echo "No Kworker to Disable"
else
    echo "Send Deactivation Signal"
    echo "disable" > "$gpe"
    echo "kworker disable: $gpe" | tee -a /var/log/syslog
fi