FYI, we noticed the following commit (built with gcc-8): commit: 956f2633e8c7229990f496320d952776c434f9c3 ("bpf, selftest: test global data/bss/rodata sections") https://git.kernel.org/cgit/linux/kernel/git/dborkman/bpf.git global_data 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): KERNEL SELFTESTS: linux_headers_dir is /usr/src/linux-headers-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3 2019-03-11 13:06:12 ln -sf /usr/bin/clang-7 /usr/bin/clang 2019-03-11 13:06:12 ln -sf /usr/bin/llc-7 /usr/bin/llc 2019-03-11 13:06:13 make run_tests -C android make: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/android' make[1]: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/android/ion' gcc -I. -I../../../../../drivers/staging/android/uapi/ -I../../../../../usr/include/ -Wall -O2 -g ionapp_export.c ipcsocket.c ionutils.c -o ionapp_export gcc -I. -I../../../../../drivers/staging/android/uapi/ -I../../../../../usr/include/ -Wall -O2 -g ionapp_import.c ipcsocket.c ionutils.c -o ionapp_import gcc -I. -I../../../../../drivers/staging/android/uapi/ -I../../../../../usr/include/ -Wall -O2 -g ionmap_test.c ipcsocket.c ionutils.c -o ionmap_test make ARCH=x86 -C ../../../../.. headers_install make[2]: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3' HOSTCC scripts/basic/fixdep WRAP arch/x86/include/generated/uapi/asm/socket.h WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h WRAP arch/x86/include/generated/uapi/asm/poll.h SYSTBL arch/x86/include/generated/asm/syscalls_32.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h HOSTCC arch/x86/tools/relocs_32.o HOSTCC arch/x86/tools/relocs_64.o HOSTCC arch/x86/tools/relocs_common.o HOSTLD arch/x86/tools/relocs UPD include/generated/uapi/linux/version.h HOSTCC scripts/unifdef INSTALL usr/include/asm-generic/ (36 files) INSTALL usr/include/drm/ (26 files) INSTALL usr/include/linux/ (505 files) INSTALL usr/include/linux/android/ (2 files) INSTALL usr/include/linux/byteorder/ (2 files) INSTALL usr/include/linux/caif/ (2 files) INSTALL usr/include/linux/can/ (6 files) INSTALL usr/include/linux/cifs/ (1 file) INSTALL usr/include/linux/dvb/ (8 files) INSTALL usr/include/linux/genwqe/ (1 file) INSTALL usr/include/linux/hdlc/ (1 file) INSTALL usr/include/linux/hsi/ (2 files) INSTALL usr/include/linux/iio/ (2 files) INSTALL usr/include/linux/isdn/ (1 file) INSTALL usr/include/linux/mmc/ (1 file) INSTALL usr/include/linux/netfilter/ (88 files) INSTALL usr/include/linux/netfilter/ipset/ (4 files) INSTALL usr/include/linux/netfilter_arp/ (2 files) INSTALL usr/include/linux/netfilter_bridge/ (17 files) INSTALL usr/include/linux/netfilter_ipv4/ (9 files) INSTALL usr/include/linux/netfilter_ipv6/ (13 files) INSTALL usr/include/linux/nfsd/ (5 files) INSTALL usr/include/linux/raid/ (2 files) INSTALL usr/include/linux/sched/ (1 file) INSTALL usr/include/linux/spi/ (1 file) INSTALL usr/include/linux/sunrpc/ (1 file) INSTALL usr/include/linux/tc_act/ (15 files) INSTALL usr/include/linux/tc_ematch/ (5 files) INSTALL usr/include/linux/usb/ (13 files) INSTALL usr/include/linux/wimax/ (1 file) INSTALL usr/include/misc/ (2 files) INSTALL usr/include/mtd/ (5 files) INSTALL usr/include/rdma/ (25 files) INSTALL usr/include/rdma/hfi/ (2 files) INSTALL usr/include/scsi/ (5 files) INSTALL usr/include/scsi/fc/ (4 files) INSTALL usr/include/sound/ (16 files) INSTALL usr/include/video/ (3 files) INSTALL usr/include/xen/ (4 files) INSTALL usr/include/asm/ (62 files) make[2]: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3' make[1]: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/android/ion' TAP version 13 selftests: android: run.sh ======================================== ion_test.sh: No /dev/ion device found ion_test.sh: May be CONFIG_ION is not set not ok 1..1 selftests: android: run.sh [SKIP] make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/android' ping6 is /bin/ping6 ignored_by_lkp bpf.test_lirc_mode2_user test 2019-03-11 13:06:22 make run_tests -C bpf make: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf' /bin/sh: llvm-readelf: command not found make -C ../../../lib/bpf OUTPUT=/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/ make[1]: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/lib/bpf' Auto-detecting system features: ... libelf: [ on ] ... bpf: [ on ] HOSTCC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/fixdep.o HOSTLD /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/fixdep-in.o LINK /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/fixdep CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/bpf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/nlattr.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/btf.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf_errno.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/str_error.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/netlink.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/bpf_prog_linfo.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf_probes.o CC /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/xsk.o LD /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf-in.o LINK /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a LINK /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.so make[1]: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf -Iverifier test_verifier.c /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/verifier/tests.h -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf test_progs.c /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a trace_helpers.c /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/prog_tests/tests.h prog_tests/stacktrace_map.c prog_tests/xdp_noinline.c prog_tests/stacktrace_map_raw_tp.c prog_tests/signal_pending.c prog_tests/reference_tracking.c prog_tests/get_stack_raw_tp.c prog_tests/prog_run_xattr.c prog_tests/task_fd_query_tp.c prog_tests/tp_attach_query.c prog_tests/pkt_md_access.c prog_tests/xdp_adjust_tail.c prog_tests/stacktrace_build_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/l4lb_all.c prog_tests/tcp_estats.c prog_tests/obj_name.c prog_tests/map_lock.c prog_tests/global_data.c prog_tests/bpf_obj_id.c prog_tests/stacktrace_build_id_nmi.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c trace_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a cgroup_helpers.c -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/test_flow_dissector 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-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/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-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/test_global_data.o progs/test_global_data.c:37:37: warning: passing 'const __u64 *' (aka 'const unsigned long long *') to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers] bpf_map_update_elem(&result, &key, &static_rodata, 0); ^~~~~~~~~~~~~~ progs/test_global_data.c:46:37: warning: passing 'const __u64 *' (aka 'const unsigned long long *') to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers] bpf_map_update_elem(&result, &key, &static_rodata2, 0); ^~~~~~~~~~~~~~~ progs/test_global_data.c:56:37: warning: passing 'const __u64 *' (aka 'const unsigned long long *') to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers] bpf_map_update_elem(&result, &key, &static_rodata3, 0); ^~~~~~~~~~~~~~~ 3 warnings generated. LLVM ERROR: Unsupported relocation: try to compile with -O2 or above, or check your static variable usage Makefile:201: recipe for target '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/test_global_data.o' failed make: *** [/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf/test_global_data.o] Error 1 make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-956f2633e8c7229990f496320d952776c434f9c3/tools/testing/selftests/bpf' To reproduce: # build kernel cd linux cp config-5.0.0-03299-g956f263 .config make HOSTCC=gcc-8 CC=gcc-8 ARCH=x86_64 olddefconfig make HOSTCC=gcc-8 CC=gcc-8 ARCH=x86_64 prepare make HOSTCC=gcc-8 CC=gcc-8 ARCH=x86_64 modules_prepare make HOSTCC=gcc-8 CC=gcc-8 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-8 CC=gcc-8 ARCH=x86_64 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