FYI, we noticed the following commit (built with gcc-7): commit: b915ebe6d9c8c6b5427e606c0ecee53df921382b ("bpf, selftest: test global data/bss/rodata sections") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: kernel_selftests with following parameters: group: kselftests-00 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url:https://www.kernel.org/doc/Documentation/kselftest.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): If you fix the issue, kindly add following tag Reported-by: kernel test robot&lt;rong.a.chen(a)intel.com&gt; 2019-04-12 21:28:33 make run_tests -C bpf make: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf' make -C ../../../lib/bpf OUTPUT=/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/ make[1]: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/lib/bpf' Auto-detecting system features: ... libelf: [ ^[[32mon^[[m ] ... bpf: [ ^[[32mon^[[m ] HOSTCC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/fixdep.o HOSTLD /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/fixdep-in.o LINK /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/fixdep CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/bpf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/nlattr.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/btf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf_errno.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/str_error.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/netlink.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/bpf_prog_linfo.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf_probes.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/xsk.o LD /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf-in.o LINK /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a LINK /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.so.0.0.3 GEN /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.pc make[1]: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/lib/bpf' gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include -I. -I/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf -Iverifier test_verifier.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_verifier gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_tag.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_tag gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_maps.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_maps gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_lru_map.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_lru_map gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_lpm_map.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_lpm_map gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include -I. -I/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf test_progs.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a trace_helpers.c prog_tests/stacktrace_map.c prog_tests/xdp_noinline.c prog_tests/stacktrace_map_raw_tp.c prog_tests/bpf_verif_scale.c prog_tests/signal_pending.c prog_tests/reference_tracking.c prog_tests/prog_run_xattr.c prog_tests/task_fd_query_tp.c prog_tests/tp_attach_query.c prog_tests/get_stack_raw_tp.c prog_tests/pkt_md_access.c prog_tests/xdp_adjust_tail.c prog_tests/stacktrace_build_id.c prog_tests/bpf_obj_id.c prog_tests/pkt_access.c prog_tests/spinlock.c prog_tests/task_fd_query_rawtp.c prog_tests/xdp.c prog_tests/queue_stack_map.c prog_tests/flow_dissector.c prog_tests/tcp_estats.c prog_tests/obj_name.c prog_tests/map_lock.c prog_tests/global_data.c prog_tests/l4lb_all.c prog_tests/stacktrace_build_id_nmi.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_progs gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_align.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_align gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_verifier_log.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_verifier_log gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_dev_cgroup.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_dev_cgroup gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_tcpbpf_user.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_tcpbpf_user gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_sock.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_sock gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_btf.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_btf gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_sockmap.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_sockmap gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include get_cgroup_id_user.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/get_cgroup_id_user gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_socket_cookie.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_socket_cookie gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_cgroup_storage.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_cgroup_storage gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_select_reuseport.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_select_reuseport gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_section_names.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_section_names gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_netcnt.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_netcnt gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_tcpnotify_user.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c trace_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_tcpnotify_user gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_sock_fields.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_sock_fields gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_libbpf_open.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_libbpf_open gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_sock_addr.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_sock_addr gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_skb_cgroup_id_user.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_skb_cgroup_id_user gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include flow_dissector_load.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/flow_dissector_load gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_flow_dissector.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_flow_dissector gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -I../../../include test_tcp_check_syncookie_user.c /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_tcp_check_syncookie_user clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/test_stack_map.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_stack_map.o clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/test_tunnel_kern.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_tunnel_kern.o clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/dev_cgroup.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/dev_cgroup.o clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/test_lwt_ip_encap.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_lwt_ip_encap.o clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/test_obj_id.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_obj_id.o clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/lib/llvm-7/lib/clang/7.0.1/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types \ -O2 -target bpf -emit-llvm -c progs/test_global_data.c -o - | \ llc -march=bpf -mcpu=probe -filetype=obj -o /usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_global_data.o LLVM ERROR: Unsupported relocation: try to compile with -O2 or above, or check your static variable usage Makefile:204: recipe for target '/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_global_data.o' failed make: *** [/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf/test_global_data.o] Error 1 make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-b915ebe6d9c8c6b5427e606c0ecee53df921382b/tools/testing/selftests/bpf' To reproduce: # build kernel cd linux cp config-5.1.0-rc7-02038-g71ab3fd .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clonehttps://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