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Date:   Thu, 13 Apr 2017 11:00:21 +0800
From:   kernel test robot <>
To:     Mickaël Salaün <>
Cc:     "David S. Miller" <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Wang Nan <>,
        LKML <>,
        Linus Torvalds <>,
Subject: [lkp-robot] [bpf]  d498f8719a: kernel_selftests.bpf.make_fail

FYI, we noticed the following commit:

commit: d498f8719a098a5df7c6dba4ea302df7afb51efd ("bpf: Rebuild bpf.o for any dependency update") master

in testcase: kernel_selftests
with following parameters:

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.

on test machine: 72 threads Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz with 128G memory

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

KERNEL SELFTESTS: linux_headers_dir is /usr/src/linux-headers-x86_64-rhel-7.2-d498f8719a098a5df7c6dba4ea302df7afb51efd

2017-04-08 01:21:13 make run_tests -C bpf
make: Entering directory '/usr/src/linux-selftests-x86_64-rhel-7.2-d498f8719a098a5df7c6dba4ea302df7afb51efd/tools/testing/selftests/bpf'
make -C ../../../lib/bpf/
make[1]: Entering directory '/usr/src/linux-selftests-x86_64-rhel-7.2-d498f8719a098a5df7c6dba4ea302df7afb51efd/tools/testing/selftests/bpf'
make[1]: *** ../../../lib/bpf/: No such file or directory.  Stop.
make[1]: Leaving directory '/usr/src/linux-selftests-x86_64-rhel-7.2-d498f8719a098a5df7c6dba4ea302df7afb51efd/tools/testing/selftests/bpf'
Makefile:19: recipe for target '../../../lib/bpf/bpf.o' failed
make: *** [../../../lib/bpf/bpf.o] Error 2
make: Leaving directory '/usr/src/linux-selftests-x86_64-rhel-7.2-d498f8719a098a5df7c6dba4ea302df7afb51efd/tools/testing/selftests/bpf'

To reproduce:

        git clone
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml


View attachment "job-script" of type "text/plain" (5190 bytes)

Download attachment "kmsg.xz" of type "application/octet-stream" (43708 bytes)

View attachment "kernel_selftests" of type "text/plain" (95858 bytes)

View attachment "job.yaml" of type "text/plain" (4478 bytes)

View attachment "reproduce" of type "text/plain" (949 bytes)

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