Greeting,

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

commit: c5665868183fec689dbab9fb8505188b2c4f0757 ("mm: kmemleak: use the memory pool for early allocations")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


in testcase: rcuperf
with following parameters:

	runtime: 300s
	perf_type: srcu



on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+--------------------------------------------------------------------------------------+------------+------------+
|                                                                                      | 0647398a8c | c566586818 |
+--------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                       | 0          | 0          |
| boot_failures                                                                        | 18         | 18         |
| BUG:kernel_hang_in_boot_stage                                                        | 18         |            |
| BUG:kernel_hang_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok | 0          | 18         |
+--------------------------------------------------------------------------------------+------------+------------+


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


early console in setup code
Probing EDD (edd=off to disable)... ok
BUG: kernel hang in early-boot stage, last printk: Probing EDD (edd=off to disable)... ok
Linux version 5.3.0-11792-gc5665868183fec #1
Command line: ip=::::vm-snb-i386-43::dhcp root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/vm-snb-i386-43/rcuperf-srcu-300s-debian-i386-20191205.cgz-c5665868183fec689dbab9fb8505188b2c4f0757-20200817-4365-xzdqse-11.yaml ARCH=i386 kconfig=i386-randconfig-a013-20200808 branch=linus/master commit=c5665868183fec689dbab9fb8505188b2c4f0757 BOOT_IMAGE=/pkg/linux/i386-randconfig-a013-20200808/gcc-9/c5665868183fec689dbab9fb8505188b2c4f0757/vmlinuz-5.3.0-11792-gc5665868183fec max_uptime=1500 RESULT_ROOT=/result/rcuperf/srcu-300s/vm-snb-i386/debian-i386-20191205.cgz/i386-randconfig-a013-20200808/gcc-9/c5665868183fec689dbab9fb8505188b2c4f0757/8 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

Kboot worker: lkp-worker33
Elapsed time: 780


To reproduce:

        # build kernel
	cd linux
	cp config-5.3.0-11792-gc5665868183fec .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 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,
Rong Chen