linux-kernel - [lkp-robot] [vti6] b4331a6818: kernel

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Date:   Tue, 5 Jun 2018 15:09:27 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Xin Long <lucien.xin@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org
Subject: [lkp-robot] [vti6]  b4331a6818: kernel_selftests.net.pmtu.sh.fail


FYI, we noticed the following commit (built with gcc-7):

commit: b4331a681822b420511b3258f1c3db35001fde48 ("vti6: Change minimum MTU to IPV4_MIN_MTU, vti6 can carry IPv4 too")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: kernel_selftests
with following parameters:

	group: kselftests-02

test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt


on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


selftests: pmtu.sh
========================================
TEST: vti6: PMTU exceptions                                         [ OK ]
TEST: vti4: PMTU exceptions                                         [ OK ]
TEST: vti4: default MTU assignment                                  [ OK ]
TEST: vti6: default MTU assignment                                  [ OK ]
TEST: vti4: MTU setting on link creation                            [ OK ]
TEST: vti6: MTU setting on link creation                            [FAIL]
  vti6 tunnel created with invalid MTU 1279
TEST: vti6: MTU changes on link changes                             [ OK ]
not ok 1..13 selftests:  pmtu.sh [FAIL]
make: Leaving directory '/usr/src/linux-selftests-x86_64-fedora-25-b4331a681822b420511b3258f1c3db35001fde48/tools/testing/selftests/net'


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.16.0-07301-gb4331a6" of type "text/plain" (193001 bytes)

View attachment "job-script" of type "text/plain" (5672 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (42584 bytes)

View attachment "kernel_selftests" of type "text/plain" (76155 bytes)