Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}"