FYI, we noticed the following commit (built with gcc-7):

commit: dea079527088cffccd014c815ecaf5b0f0506c59 ("[[repost]RFC PATCH] mm/workingset : judge file page activity via timestamp")
url: https://github.com/0day-ci/linux/commits/Zhaoyang-Huang/RFC-PATCH-mm-workingset-judge-file-page-activity-via-timestamp/20190429-080234


in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


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

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


+-------------------------------+------------+------------+
|                               | 9520b5324b | dea0795270 |
+-------------------------------+------------+------------+
| boot_successes                | 4          | 0          |
| boot_failures                 | 0          | 4          |
| BUG:kernel_hang_in_boot_stage | 0          | 4          |
+-------------------------------+------------+------------+


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


[    0.067096] ACPI: Early table checksum verification disabled
[    0.068955] ACPI: RSDP 0x00000000000F6840 000014 (v00 BOCHS )
[    0.071039] ACPI: RSDT 0x000000007FFE15C9 000030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.073473] ACPI: FACP 0x000000007FFE149D 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.075983] ACPI: DSDT 0x000000007FFE0040 00145D (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
BUG: kernel hang in boot stage

Elapsed time: 140

qemu-img create -f qcow2 disk-vm-snb-2G-406-0 256G
qemu-img create -f qcow2 disk-vm-snb-2G-406-1 256G


To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc6-00158-gdea07952 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp