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Date:   Sun, 6 Sep 2020 16:52:31 +0800
From:   kernel test robot <>
To:     Yunsheng Lin <>
        0day robot <>,
Subject: [net] 6fd0d0dede:


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

commit: 6fd0d0deded94645d8cb96f93c26ad55cd92f6a5 ("[PATCH net-next] net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
base: 10eb4667946068e34f0cde1485f030aa68c89275

in testcase: hwsim
version: hwsim-x86_64-6eb6cf0-1_20200619
with following parameters:

	group: hwsim-03
	ucode: 0x21

on test machine: 8 threads Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz with 16G 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 <>

2020-09-05 21:47:27 	./ ap_ht40_5ghz_switch 
DEV: wlan0: 02:00:00:00:00:00
DEV: wlan1: 02:00:00:00:01:00
DEV: wlan2: 02:00:00:00:02:00
APDEV: wlan3
APDEV: wlan4
START ap_ht40_5ghz_switch 1/1
Test: HT40 co-ex scan on 5 GHz switching pri/sec channel
Starting AP wlan4
Starting AP wlan3
Connect STA wlan0 to AP
wlan0: Country code not reset back to 00: is US
wlan0: Country code cleared back to 00
FAIL ap_ht40_5ghz_switch 3.614883 2020-09-05 21:47:31.016291
passed 0 test case(s)
skipped 0 test case(s)
failed tests: ap_ht40_5ghz_switch

To reproduce:

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

Rong Chen

View attachment "config-5.9.0-rc1-00658-g6fd0d0deded94" of type "text/plain" (170314 bytes)

View attachment "job-script" of type "text/plain" (5668 bytes)

Download attachment "kmsg.xz" of type "application/x-xz" (121256 bytes)

View attachment "hwsim" of type "text/plain" (46265 bytes)

View attachment "job.yaml" of type "text/plain" (4615 bytes)

View attachment "reproduce" of type "text/plain" (4507 bytes)

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