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Date:   Mon, 1 Feb 2021 13:23:46 +0800
From:   kernel test robot <>
To:     Vincent Guittot <>
Cc:     0day robot <>, LKML <>,,,
Subject: [sched/fair]  57782d5297: assertion_failure


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

commit: 57782d52974dc0cc2222c92fd3f01c1d9314cc04 ("sched/fair: Rate limit calls to update_blocked_averages() for NOHZ") UPDATE-20210130-013452/Peter-Oskolkov/sched-a-very-minor-refactoring/20210129-202111

in testcase: igt
version: igt-x86_64-e230cd8d-1_20210106
with following parameters:

	group: group-23
	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 <>

[  236.033521] Using a target of 1024 cursor updates per quarter-vblank
[  236.033525]
[  238.635599] page flip 7 was delayed, missed 126 frames
[  238.635602]
[  238.637503] [IGT] kms_cursor_legacy: exiting, ret=98
[  238.643907] (kms_cursor_legacy:3780) CRITICAL: Test assertion failure function cursor_vs_flip, file ../tests/kms_cursor_legacy.c:1083:
[  238.647164]
[  238.660927] Console: switching to colour frame buffer device 160x64
[  238.664029] (kms_cursor_legacy:3780) CRITICAL: Failed assertion: vbl.sequence <= vblank_start + 5 * vrefresh / 8
[  238.670019]
[  238.683172] (kms_cursor_legacy:3780) CRITICAL: error: 12997 > 12878

To reproduce:

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

Oliver Sang

View attachment "config-5.11.0-rc2-00011-g57782d52974d" of type "text/plain" (172412 bytes)

View attachment "job-script" of type "text/plain" (5387 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (34552 bytes)

View attachment "igt" of type "text/plain" (146808 bytes)

View attachment "job.yaml" of type "text/plain" (4304 bytes)

View attachment "reproduce" of type "text/plain" (17598 bytes)

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