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

commit: e62016662d0971f63dd4c1a482aeb7ca53df8aca ("kernfs, sysfs, cgroup, intel_rdt: Support fs_context")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: phoronix-test-suite
with following parameters:

	need_x: true
	test: tesseract-1.1.0
	cpufreq_governor: performance

test-description: The Phoronix Test Suite is the most comprehensive testing and benchmarking platform available that provides an extensible framework for which new tests can be easily added.
test-url: http://www.phoronix-test-suite.com/


on test machine: 16 threads Intel(R) Xeon(R) CPU X5570 @ 2.93GHz with 48G memory

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

user  :notice: [   26.169044 ] Kernel tests: Boot OK!

kern  :err   : [   26.316791 ] cgroup1: Unknown subsys name '__DEVEL__sane_behavior'
kern  :err   : [   26.493821 ] cgroup1: Unknown subsys name '__DEVEL__sane_behavior'
kern  :err   : [   26.666249 ] cgroup1: Unknown subsys name '__DEVEL__sane_behavior'
kern  :err   : [   26.814922 ] cgroup1: Unknown subsys name '__DEVEL__sane_behavior'
kern  :err   : [   27.068700 ] cgroup1: Unknown subsys name '__DEVEL__sane_behavior'



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