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Date:   Sun, 17 May 2020 09:17:32 +0800
From:   kernel test robot <>
To:     "Paul E. McKenney" <>
Cc:     LKML <>,
Subject: [rcu] 2f08469563: BUG:kernel_reboot-without-warning_in_boot_stage


FYI, we noticed the following commit (built with clang-11):

commit: 2f08469563550d15cb08a60898d3549720600eee ("rcu: Mark rcu_state.ncpus to detect concurrent writes") dev.2020.05.14c

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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 <>

[    0.054943] BRK [0x05204000, 0x05204fff] PGTABLE
[    0.061181] BRK [0x05205000, 0x05205fff] PGTABLE
[    0.062403] BRK [0x05206000, 0x05206fff] PGTABLE
[    0.065200] RAMDISK: [mem 0x7a247000-0x7fffffff]
[    0.067344] ACPI: Early table checksum verification disabled
BUG: kernel reboot-without-warning in boot stage

Elapsed time: 60

qemu-img create -f qcow2 disk-vm-snb-16-0 256G
qemu-img create -f qcow2 disk-vm-snb-16-1 256G

To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-rc2-00003-g2f08469563550 .config
	make HOSTCC=clang-11 CC=clang-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage

        git clone
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email

Rong Chen

View attachment "config-5.7.0-rc2-00003-g2f08469563550" of type "text/plain" (131177 bytes)

View attachment "job-script" of type "text/plain" (4878 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (2392 bytes)

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