linux-kernel - Re: [LKP] [tools] 6534770d6f: kernel_selftests.bpf.test_lwt

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Date:   Thu, 1 Nov 2018 11:18:49 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org,
        Martin KaFai Lau <kafai@...com>, Okash Khawaja <osk@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [LKP] [tools]  6534770d6f:
 kernel_selftests.bpf.test_lwt_seg6local.fail

On Thu, 1 Nov 2018 11:26:44 +0800, kernel test robot wrote:
> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 6534770d6f176093b50896961107b2d545ef38f0 ("tools: bpf: fix BTF code added twice to different trees")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

That's a fix to a merge commit, perhaps something before broke it?

> in testcase: kernel_selftests
> with following parameters:
> 
> 	group: kselftests-00
> 
> 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: 80 threads Skylake with 64G memory
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> commit:
>   6b431d50d2a8acd1c418b998b856a055252ebc3a
>   6534770d6f176093b50896961107b2d545ef38f0
> 
> 6b431d50d2a8acd1 6534770d6f176093b508969611
> ---------------- --------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>         443:8        14689%        1618:8     dmesg.timestamp:last
>            :8          100%           8:8     kernel_selftests.bpf.test_lwt_seg6local.fail
>            :8          100%           8:8     kernel_selftests.bpf.test_lwt_seg6local.sh.fail
> 
> 
> 
> 
> To reproduce:
> 
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp install job.yaml  # job file is attached in this email
>         bin/lkp run     job.yaml
> 
> 
> 
> Thanks,
> Rong Chen