netcons_torture.sh

  1#!/usr/bin/env bash
  2# SPDX-License-Identifier: GPL-2.0
  3
  4# Repeatedly send kernel messages, toggles netconsole targets on and off,
  5# creates and deletes targets in parallel, and toggles the source interface to
  6# simulate stress conditions.
  7#
  8# This test aims to verify the robustness of netconsole under dynamic
  9# configurations and concurrent operations.
 10#
 11# The major goal is to run this test with LOCKDEP, Kmemleak and KASAN to make
 12# sure no issues is reported.
 13#
 14# Author: Breno Leitao <leitao@debian.org>
 15
 16set -euo pipefail
 17
 18SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
 19
 20source "${SCRIPTDIR}"/lib/sh/lib_netcons.sh
 21
 22# Number of times the main loop run
 23ITERATIONS=${1:-150}
 24
 25# Only test extended format
 26FORMAT="extended"
 27# And ipv6 only
 28IP_VERSION="ipv6"
 29
 30# Create, enable and delete some targets.
 31create_and_delete_random_target() {
 32	COUNT=2
 33	RND_PREFIX=$(mktemp -u netcons_rnd_XXXX_)
 34
 35	if [ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}${COUNT}"  ] || \
 36	   [ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}0" ]; then
 37		echo "Function didn't finish yet, skipping it." >&2
 38		return
 39	fi
 40
 41	# enable COUNT targets
 42	for i in $(seq ${COUNT})
 43	do
 44		RND_TARGET="${RND_PREFIX}"${i}
 45		RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"
 46
 47		# Basic population so the target can come up
 48		_create_dynamic_target "${FORMAT}" "${RND_TARGET_PATH}"
 49	done
 50
 51	echo "netconsole selftest: ${COUNT} additional targets were created" > /dev/kmsg
 52	# disable them all
 53	for i in $(seq ${COUNT})
 54	do
 55		RND_TARGET="${RND_PREFIX}"${i}
 56		RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"
 57		if [[ $(cat "${RND_TARGET_PATH}/enabled") -eq 1 ]]
 58		then
 59			echo 0 > "${RND_TARGET_PATH}"/enabled
 60		fi
 61		rmdir "${RND_TARGET_PATH}"
 62	done
 63}
 64
 65# Disable and enable the target mid-air, while messages
 66# are being transmitted.
 67toggle_netcons_target() {
 68	for i in $(seq 2)
 69	do
 70		if [ ! -d "${NETCONS_PATH}" ]
 71		then
 72			break
 73		fi
 74		echo 0 > "${NETCONS_PATH}"/enabled 2> /dev/null || true
 75		# Try to enable a bit harder, given it might fail to enable
 76		# Write to `enabled` might fail depending on the lock, which is
 77		# highly contentious here
 78		for _ in $(seq 5)
 79		do
 80			echo 1 > "${NETCONS_PATH}"/enabled 2> /dev/null || true
 81		done
 82	done
 83}
 84
 85toggle_iface(){
 86	ip link set "${SRCIF}" down
 87	ip link set "${SRCIF}" up
 88}
 89
 90# Start here
 91
 92modprobe netdevsim 2> /dev/null || true
 93modprobe netconsole 2> /dev/null || true
 94
 95# Check for basic system dependency and exit if not found
 96check_for_dependencies
 97# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)
 98echo "6 5" > /proc/sys/kernel/printk
 99# Remove the namespace, interfaces and netconsole target on exit
100trap cleanup EXIT
101# Create one namespace and two interfaces
102set_network "${IP_VERSION}"
103# Create a dynamic target for netconsole
104create_dynamic_target "${FORMAT}"
105
106for i in $(seq "$ITERATIONS")
107do
108	for _ in $(seq 10)
109	do
110		echo "${MSG}: ${TARGET} ${i}" > /dev/kmsg
111	done
112	wait
113
114	if (( i % 30 == 0 )); then
115		toggle_netcons_target &
116	fi
117
118	if (( i % 50 == 0 )); then
119		# create some targets, enable them, send msg and disable
120		# all in a parallel thread
121		create_and_delete_random_target &
122	fi
123
124	if (( i % 70 == 0 )); then
125		toggle_iface &
126	fi
127done
128wait
129
130exit "${EXIT_STATUS}"