Greeting,

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

commit: e5a6f186afc353e4462a28b4bf127e872e0716b2 ("[PATCH v3 70/75] x86/head/64: Setup TSS early for secondary CPUs")
url: https://github.com/0day-ci/linux/commits/Joerg-Roedel/x86-SEV-ES-Guest-Support/20200429-044743


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):


+-------------------------------+------------+------------+
|                               | 8d9d92d58d | e5a6f186af |
+-------------------------------+------------+------------+
| 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>


needed_size: 0x0000000002400000
trampoline_32bit: 0x000000000009d000

Decompressing Linux... Parsing ELF... done.
Booting the kernel.
BUG: kernel hang in boot stage
Linux version 5.7.0-rc2-00092-ge5a6f186afc353 #1
Command line: ip=::::vm-snb-ssd-16::dhcp root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/vm-snb-ssd-16/boot-1-yocto-x86_64-minimal-20190520.cgz-e5a6f186afc353e4462a28b4bf127e872e0716b2-20200507-6867-rkmir2-3.yaml ARCH=x86_64 kconfig=x86_64-lkp branch=linux-devel/devel-hourly-2020050609 commit=e5a6f186afc353e4462a28b4bf127e872e0716b2 BOOT_IMAGE=/pkg/linux/x86_64-lkp/gcc-7/e5a6f186afc353e4462a28b4bf127e872e0716b2/vmlinuz-5.7.0-rc2-00092-ge5a6f186afc353 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-snb-ssd/yocto-x86_64-minimal-20190520.cgz/x86_64-lkp/gcc-7/e5a6f186afc353e4462a28b4bf127e872e0716b2/3 LKP_SERVER=inn selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 watchdog_thresh=60

Elapsed time: 420



To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-rc2-00092-ge5a6f186afc353 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare 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