On Sun, Oct 20, 2019 at 7:18 PM Prabhakar Kushwaha <prabhakar.pkin@xxxxxxxxx> wrote: > > > Hi All, > > I am trying to build kselftest on Linux-5.4 on ubuntu 18.04. I installed > LLVM-9.0.0 and Clang-9.0.0 from below links after following steps from > [1] because of discussion [2] > > https://releases.llvm.org/9.0.0/llvm-9.0.0.src.tar.xz > https://releases.llvm.org/9.0.0/clang-tools-extra-9.0.0.src.tar.xz > https://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz > > > Now, i am trying with llc -march=bpf, with this segmentation fault is > coming as below: > > > gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib > -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR > -I../../../include -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program test_flow_dissector.c > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o > /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf > -lrt -lpthread -o > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_flow_dissector > gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib > -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR > -I../../../include -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program > test_tcp_check_syncookie_user.c > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o > /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf > -lrt -lpthread -o > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_tcp_check_syncookie_user > gcc -g -Wall -O2 -I../../../include/uapi -I../../../lib > -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR > -I../../../include -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program test_lirc_mode2_user.c > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_stub.o > /usr/src/tovards/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf > -lrt -lpthread -o > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_lirc_mode2_user > (clang -I. -I./include/uapi -I../../../include/uapi > -I/usr/src/tovards/linux/tools/testing/selftests/bpf/../usr/include > -D__TARGET_ARCH_arm64 -g -idirafter /usr/local/include -idirafter > /usr/local/lib/clang/9.0.0/include -idirafter > /usr/include/aarch64-linux-gnu -idirafter /usr/include > -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm \ > -c progs/test_core_reloc_arrays.c -o - || echo "clang failed") | \ > llc -march=bpf -mcpu=probe -filetype=obj -o > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o > Stack dump: > 0. Program arguments: llc -march=bpf -mcpu=probe -filetype=obj -o > /usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o > 1. Running pass 'Function Pass Manager' on module '<stdin>'. > 2. Running pass 'BPF Assembly Printer' on function '@test_core_arrays' > #0 0x0000aaaac618db08 llvm::sys::PrintStackTrace(llvm::raw_ostream&) > (/usr/local/bin/llc+0x152eb08) > Segmentation fault > Makefile:260: recipe for target > '/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o' > failed > make[1]: *** > [/usr/src/tovards/linux/tools/testing/selftests/bpf/test_core_reloc_arrays.o] > Error 139 > To add more details, Commenting following lines in bpf/progs/test_core_reloc_arrays.c removes the segmentation fault. --- a/tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c @@ -41,15 +41,14 @@ int test_core_arrays(void *ctx) if (BPF_CORE_READ(&out->a2, &in->a[2])) return 1; /* in->b[1][2][3] */ - if (BPF_CORE_READ(&out->b123, &in->b[1][2][3])) - return 1; +// if (BPF_CORE_READ(&out->b123, &in->b[1][2][3])) +// return 1; /* in->c[1].c */ if (BPF_CORE_READ(&out->c1c, &in->c[1].c)) return 1; /* in->d[0][0].d */ - if (BPF_CORE_READ(&out->d00d, &in->d[0][0].d)) - return 1; - +// if (BPF_CORE_READ(&out->d00d, &in->d[0][0].d)) +// return 1; return 0; } It looks to be something related llc and more than 1 dimension array. has anyone faced such error. --prabhakar (pk)
