Greeting,

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

commit: 303cc571d107b3641d6487061b748e70ffe15ce4 (" iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCXrvAwgAKCRCRxhvAZXjc")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: ltp
with following parameters:

	disk: 1HDD
	fs: btrfs
	test: syscalls_part5

test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features.
test-url: http://linux-test-project.github.io/


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):




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




<<<test_start>>>
tag=setns01 stime=1592200758
cmdline="setns01"
contacts=""
analysis=exit
<<<test_output>>>
setns01     0  TINFO  :  ns_name=ipc, ns_fds[0]=7, ns_types[0]=0x8000000
setns01     0  TINFO  :  ns_name=mnt, ns_fds[1]=8, ns_types[1]=0x20000
setns01     0  TINFO  :  ns_name=net, ns_fds[2]=9, ns_types[2]=0x40000000
setns01     0  TINFO  :  ns_name=pid, ns_fds[3]=10, ns_types[3]=0x20000000
setns01     0  TINFO  :  ns_name=uts, ns_fds[4]=11, ns_types[4]=0x4000000
setns01     0  TINFO  :  setns(-1, 0x8000000)
setns01     1  TPASS  :  invalid fd exp_errno=9
setns01     0  TINFO  :  setns(-1, 0x20000)
setns01     2  TPASS  :  invalid fd exp_errno=9
setns01     0  TINFO  :  setns(-1, 0x40000000)
setns01     3  TPASS  :  invalid fd exp_errno=9
setns01     0  TINFO  :  setns(-1, 0x20000000)
setns01     4  TPASS  :  invalid fd exp_errno=9
setns01     0  TINFO  :  setns(-1, 0x4000000)
setns01     5  TPASS  :  invalid fd exp_errno=9
setns01     0  TINFO  :  setns(12, 0x8000000)
setns01     6  TFAIL  :  setns01.c:176: regular file fd exp_errno=22: errno=EBADF(9): Bad file descriptor
setns01     0  TINFO  :  setns(12, 0x20000)
setns01     7  TFAIL  :  setns01.c:176: regular file fd exp_errno=22: errno=EBADF(9): Bad file descriptor
setns01     0  TINFO  :  setns(12, 0x40000000)
setns01     8  TFAIL  :  setns01.c:176: regular file fd exp_errno=22: errno=EBADF(9): Bad file descriptor
setns01     0  TINFO  :  setns(12, 0x20000000)
setns01     9  TFAIL  :  setns01.c:176: regular file fd exp_errno=22: errno=EBADF(9): Bad file descriptor
setns01     0  TINFO  :  setns(12, 0x4000000)
setns01    10  TFAIL  :  setns01.c:176: regular file fd exp_errno=22: errno=EBADF(9): Bad file descriptor
setns01     0  TINFO  :  setns(7, 0xffffffff)
setns01    11  TPASS  :  invalid ns_type exp_errno=22
setns01     0  TINFO  :  setns(8, 0xffffffff)
setns01    12  TPASS  :  invalid ns_type exp_errno=22
setns01     0  TINFO  :  setns(9, 0xffffffff)
setns01    13  TPASS  :  invalid ns_type exp_errno=22
setns01     0  TINFO  :  setns(10, 0xffffffff)
setns01    14  TPASS  :  invalid ns_type exp_errno=22
setns01     0  TINFO  :  setns(11, 0xffffffff)
setns01    15  TPASS  :  invalid ns_type exp_errno=22
setns01     0  TINFO  :  setns(7, 0x20000)
setns01    16  TPASS  :  mismatch ns_type/fd exp_errno=22
setns01     0  TINFO  :  setns(8, 0x40000000)
setns01    17  TPASS  :  mismatch ns_type/fd exp_errno=22
setns01     0  TINFO  :  setns(9, 0x20000000)
setns01    18  TPASS  :  mismatch ns_type/fd exp_errno=22
setns01     0  TINFO  :  setns(10, 0x4000000)
setns01    19  TPASS  :  mismatch ns_type/fd exp_errno=22
setns01     0  TINFO  :  setns(11, 0x8000000)
setns01    20  TPASS  :  mismatch ns_type/fd exp_errno=22
setns01     0  TINFO  :  setns(7, 0x8000000)
setns01    21  TPASS  :  without CAP_SYS_ADMIN exp_errno=1
setns01     0  TINFO  :  setns(8, 0x20000)
setns01    22  TPASS  :  without CAP_SYS_ADMIN exp_errno=1
setns01     0  TINFO  :  setns(9, 0x40000000)
setns01    23  TPASS  :  without CAP_SYS_ADMIN exp_errno=1
setns01     0  TINFO  :  setns(10, 0x20000000)
setns01    24  TPASS  :  without CAP_SYS_ADMIN exp_errno=1
setns01     0  TINFO  :  setns(11, 0x4000000)
setns01    25  TPASS  :  without CAP_SYS_ADMIN exp_errno=1
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=1 corefile=no
cutime=0 cstime=1
<<<test_end>>>

LTP Version: 20200515-23-gec1b91c46

       ###############################################################

            Done executing testcases.
            LTP Version:  20200515-23-gec1b91c46
       ###############################################################




To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-rc4-00002-g303cc571d107b .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


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



Thanks,
Rong Chen