Re: [BUG] selftests/net: test_vxlan_mdb.sh: 84 out of 642 tests [FAIL]

[Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>]

On 3/18/24 04:35, Hangbin Liu wrote:
> On Sun, Mar 17, 2024 at 12:19:12AM +0100, Mirsad Todorovac wrote:
>> Hi,
>>
>> While running kselftest on vanilla torvalds tree kernel commit v6.8-11167-g4438a810f396,
>> the test suite reported a number of errors.
>>
>> I was using the latest iproute2-next suite on an Ubuntu 22.04 LTS box.
>>
>> # Tests passed: 558
>> # Tests failed:  84
>> not ok 90 selftests: net: test_vxlan_mdb.sh # exit=1
> 
> FYI, I tested with 6.8 kernel with net tree. All passed.
> 
> Data path: MDB torture test - IPv6 overlay / IPv6 underlay
> ----------------------------------------------------------
> TEST: Torture test                                                  [ OK ]
> 
> Tests passed: 642
> Tests failed:   0
> 
> # uname -r
> 6.8.0-virtme
> 
> Thanks
> Hangbin

Hi, Hangbin,

I am running an Ubuntu 22.04 LTS configuration.

I tried it again with 6.8.0-net-next-05204-g237bb5f7f7f5 and iproute2-next
from this repo: https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git

RESULTS:

# Data path: MDB torture test - IPv6 overlay / IPv6 underlay
# ----------------------------------------------------------
# TEST: Torture test                                                  [ OK ]
#
# Tests passed: 558
# Tests failed:  84
not ok 90 selftests: net: test_vxlan_mdb.sh # exit=1

David said there may be something in sysctl.conf:

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
#

#kernel.domainname = example.com

# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3

###################################################################
# Functions previously found in netbase
#

# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1

# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1

# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1

net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0


###################################################################
# Additional settings - these settings can improve the network
# security of the host and prevent against some network attacks
# including spoofing attacks and man in the middle attacks through
# redirection. Some network environments, however, require that these
# settings are disabled so review and enable them as needed.
#
# Do not accept ICMP redirects (prevent MITM attacks)
net.ipv4.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
# _or_
# Accept ICMP redirects only for gateways listed in our default
# gateway list (enabled by default)
# net.ipv4.conf.all.secure_redirects = 1
#
# Do not send ICMP redirects (we are not a router)
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1
#
# Do not accept IP source route packets (we are not a router)
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.default.log_martians = 0
#

###################################################################
# Magic system request Key
# 0=disable, 1=enable all, >1 bitmask of sysrq functions
# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
# for what other values do
#kernel.sysrq=438

Best regards,
Mirsad