FYI, we noticed the following commit:

commit: 74bf22febcf0fd47bcc98ca7d0cd22eecb82308d ("kselftest: exec: make exec test output conform to TAP13")
url: https://github.com/0day-ci/linux/commits/Paul-Elder/kselftest-exec-make-exec-test-output-conform-to-TAP13/20170824-072259


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.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt


on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G 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-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d
2017-08-26 22:21:12 ln -sf /usr/bin/gcc-5 /usr/bin/gcc

2017-08-26 22:21:12 make run_tests -C bpf
make: Entering directory '/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/bpf'
make -C ../../../lib/bpf OUTPUT=/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/bpf/
make[1]: Entering directory '/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/lib/bpf'

...
2017-08-26 22:25:11 make run_tests -C exec
make: Entering directory '/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/exec'
gcc -Wall    execveat.c  -o /usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/exec/execveat
execveat.c: In function 'run_tests':
execveat.c:371:9: warning: implicit declaration of function 'ksft_get_fail_cnt' [-Wimplicit-function-declaration]
  return ksft_get_fail_cnt();
         ^
/tmp/lkp/ccrw6YiO.o: In function `run_tests':
execveat.c:(.text+0x1250): undefined reference to `ksft_get_fail_cnt'
collect2: error: ld returned 1 exit status
../lib.mk:62: recipe for target '/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/exec/execveat' failed
make: *** [/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/exec/execveat] Error 1
make: Leaving directory '/usr/src/linux-selftests-x86_64-rhel-7.2-74bf22febcf0fd47bcc98ca7d0cd22eecb82308d/tools/testing/selftests/exec'



To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Xiaolong