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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0
# Repeatedly send kernel messages, toggles netconsole targets on and off,
# creates and deletes targets in parallel, and toggles the source interface to
# simulate stress conditions.
#
# This test aims to verify the robustness of netconsole under dynamic
# configurations and concurrent operations.
#
# The major goal is to run this test with LOCKDEP, Kmemleak and KASAN to make
# sure no issues is reported.
#
# Author: Breno Leitao <leitao@debian.org>
set -euo pipefail
SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
source "${SCRIPTDIR}"/lib/sh/lib_netcons.sh
# Number of times the main loop run
ITERATIONS=${1:-150}
# Only test extended format
FORMAT="extended"
# And ipv6 only
IP_VERSION="ipv6"
# Create, enable and delete some targets.
create_and_delete_random_target() {
COUNT=2
RND_PREFIX=$(mktemp -u netcons_rnd_XXXX_)
if [ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}${COUNT}" ] || \
[ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}0" ]; then
echo "Function didn't finish yet, skipping it." >&2
return
fi
# enable COUNT targets
for i in $(seq ${COUNT})
do
RND_TARGET="${RND_PREFIX}"${i}
RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"
# Basic population so the target can come up
_create_dynamic_target "${FORMAT}" "${RND_TARGET_PATH}"
done
echo "netconsole selftest: ${COUNT} additional targets were created" > /dev/kmsg
# disable them all
for i in $(seq ${COUNT})
do
RND_TARGET="${RND_PREFIX}"${i}
RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"
if [[ $(cat "${RND_TARGET_PATH}/enabled") -eq 1 ]]
then
echo 0 > "${RND_TARGET_PATH}"/enabled
fi
rmdir "${RND_TARGET_PATH}"
done
}
# Disable and enable the target mid-air, while messages
# are being transmitted.
toggle_netcons_target() {
for i in $(seq 2)
do
if [ ! -d "${NETCONS_PATH}" ]
then
break
fi
echo 0 > "${NETCONS_PATH}"/enabled 2> /dev/null || true
# Try to enable a bit harder, given it might fail to enable
# Write to `enabled` might fail depending on the lock, which is
# highly contentious here
for _ in $(seq 5)
do
echo 1 > "${NETCONS_PATH}"/enabled 2> /dev/null || true
done
done
}
toggle_iface(){
ip link set "${SRCIF}" down
ip link set "${SRCIF}" up
}
# Start here
modprobe netdevsim 2> /dev/null || true
modprobe netconsole 2> /dev/null || true
# Check for basic system dependency and exit if not found
check_for_dependencies
# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)
echo "6 5" > /proc/sys/kernel/printk
# Remove the namespace, interfaces and netconsole target on exit
trap cleanup EXIT
# Create one namespace and two interfaces
set_network "${IP_VERSION}"
# Create a dynamic target for netconsole
create_dynamic_target "${FORMAT}"
for i in $(seq "$ITERATIONS")
do
for _ in $(seq 10)
do
echo "${MSG}: ${TARGET} ${i}" > /dev/kmsg
done
wait
if (( i % 30 == 0 )); then
toggle_netcons_target &
fi
if (( i % 50 == 0 )); then
# create some targets, enable them, send msg and disable
# all in a parallel thread
create_and_delete_random_target &
fi
if (( i % 70 == 0 )); then
toggle_iface &
fi
done
wait
exit "${EXIT_STATUS}"
|
