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

commit: 8651ec01daedad26290f76beeb4736f9d2da4b87 ("module: add support for symbol namespaces.")
https://kernel.googlesource.com/pub/scm/linux/kernel/git/jeyu/linux.git modules-next

in testcase: rcutorture
with following parameters:

	runtime: 300s
	test: default
	torture_type: rcu

test-description: rcutorture is rcutorture kernel module load/unload test.
test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


+-------------------------------+------------+------------+
|                               | ed13fc33f7 | 8651ec01da |
+-------------------------------+------------+------------+
| boot_successes                | 49         | 0          |
| boot_failures                 | 0          | 40         |
| BUG:kernel_hang_in_test_stage | 0          | 40         |
+-------------------------------+------------+------------+


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


[   14.878132] 
[   14.914040] result_service=inn:/result, RESULT_MNT=/inn/result, RESULT_ROOT=/inn/result/rcutorture/300s-default-rcu/vm-snb-ssd-4G/aliyun-x86_64-2019-06-26.cgz/x86_64-fedora-25/gcc-7/8651ec01daedad26290f76beeb4736f9d2da4b87/3
[   14.914043] 
[   14.925470] mount.nfs: try 1 time... mount.nfs -o vers=3 inn:/result /inn/result
[   14.925472] 
BUG: kernel hang in test stage

Elapsed time: 2740

qemu-img create -f qcow2 disk-vm-snb-ssd-4G-7d4a4c5ef8d1-0 256G
qemu-img create -f qcow2 disk-vm-snb-ssd-4G-7d4a4c5ef8d1-1 256G


To reproduce:

        # build kernel
	cd linux
	cp config-5.3.0-rc7-00003-g8651ec01daeda .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