Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 37bedbd445a62cfca3ceb2d0195df33074cbd030 ("[PATCH v2 22/24] drm/i915: Backlight update")
url: https://github.com/0day-ci/linux/commits/Sam-Ravnborg/backlight-add-init-macros-and-accessors/20200823-185007
base: https://git.kernel.org/cgit/linux/kernel/git/lee/backlight.git for-backlight-next

in testcase: suspend-stress
version: 
with following parameters:

	mode: freeze
	iterations: 10



on test machine: 8 threads Kaby Lake-R with 8G memory

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




If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@intel.com>


This commit log:
test started

Parent commit log:
SUSPEND RESUME TEST STARTED
Suspend to freeze 1/10:
/usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8
http://inn:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/lkp-kblr-hp1/suspend-stress-10-freeze-debian-x86_64-20180403.cgz-fe44d81bbc1a305a17ff6e57d103f5e94a3be276-20200828-4612-gqwcy-0.yaml&job_state=suspending-1/10
-O /dev/null
Done
Sleep for 10 seconds
...


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