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

commit: 642a312d47ceb54603630d9d04f5052f3b46d9a3 ("compiler.h: Split {READ,WRITE}_ONCE definitions out into rwonce.h")
https://git.kernel.org/cgit/linux/kernel/git/will/linux.git lto

in testcase: bpf_offload
with following parameters:


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):


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

KERNEL SELFTESTS: linux_headers_dir is /usr/src/linux-headers-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3
2019-11-12 15:37:58 cd /
2019-11-12 15:38:49 cd /usr/src/linux-selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/tools/testing/selftests
make: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/tools/bpf'

Auto-detecting system features:
...                        libbfd: [ on  ]
...        disassembler-four-args: [ OFF ]

  CC       bpf_jit_disasm.o
  LINK     bpf_jit_disasm
  CC       bpf_dbg.o
Makefile:61: recipe for target 'bpf_dbg.o' failed
make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/tools/bpf'



To reproduce:

        # build kernel
	cd linux
	cp config-5.4.0-rc6-00001-g642a312d47ceb .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,
Rong Chen