Greeting,

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

commit: eedd8093ed11ccdf4a4465f1c499c945e093aeaa ("[Intel-gfx] [CI 1/9] drm/i915/gt: Replace direct submit with direct call to tasklet")
url: https://github.com/0day-ci/linux/commits/Chris-Wilson/drm-i915-gt-Replace-direct-submit-with-direct-call-to-tasklet/20201224-215814
base: git://anongit.freedesktop.org/drm/drm-tip drm-tip

in testcase: igt
version: igt-x86_64-c88c4cc7-1_20201215
with following parameters:

	group: group-01
	ucode: 0xe2



on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 28G 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 <oliver.sang@intel.com>


[  513.814951] With one display connected: 2.96us
[  513.814952] 
[  513.816036] [IGT] gem_exec_nop: starting dynamic subtest vecs0
[  513.820274] Without a display connected (headless): 3.87us
[  513.826714] 
[  513.835841] (gem_exec_nop:2988) CRITICAL: Test assertion failure function headless, file ../tests/i915/gem_exec_nop.c:431:
[  513.835842] 
[  513.850958] (gem_exec_nop:2988) CRITICAL: Failed assertion: (n_headless) <= (1.0 + 0.1f) * n_display && (n_headless) >= (1.0 - 0.1f) * n_display
[  513.850959] 
[  513.867477] (gem_exec_nop:2988) CRITICAL: 'n_headless' != 'n_display' (0.000004 not within 10.000000% tolerance of 0.000003)
[  513.867478] 


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,
Oliver Sang