Greeting,

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

commit: a315354f66cc3285810ec2562756eb584bab902c ("net/scm: Regularize compat handling of scm_detach_fds()")
https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git for-next/seccomp


in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+-------------------------------+------------+------------+
|                               | 59a4c5d523 | a315354f66 |
+-------------------------------+------------+------------+
| boot_successes                | 5          | 3          |
| boot_failures                 | 0          | 3          |
| BUG:kernel_hang_in_test_stage | 0          | 3          |
+-------------------------------+------------+------------+


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


[ 2104.179326] systemd-journald[1641]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
[ 2204.179442] systemd-journald[1641]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
[ 2284.179253] systemd-journald[1641]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
[ 2384.179456] systemd-journald[1641]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
[ 2464.179370] systemd-journald[1641]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
BUG: kernel hang in test stage

Elapsed time: 2520

qemu-img create -f qcow2 disk-vm-snb-ssd-59-0 256G
qemu-img create -f qcow2 disk-vm-snb-ssd-59-1 256G


To reproduce:

        # build kernel
	cd linux
	cp config-5.8.0-rc1-00024-ga315354f66cc3 .config
	make HOSTCC=gcc-9 CC=gcc-9 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