Loading of bpf fails with invalid argument about libbpf-bootstrap

[pfl]

Yes, it was the kernel configuration due to a reduced set of features. Once enabling

CONFIG_KPROBES=y
CONFIG_UPROBES=y
CONFIG_DEBUG_FS=y
CONFIG_FTRACE=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_KPROBE_EVENTS=y
CONFIG_UPROBE_EVENTS=y
CONFIG_BPF_EVENTS=y

with some of those and others getting enabled along the way, the eBPF code started working.

Thanks for the kernel configuration pointer!

[anakryiko]

Most probably it's your kernel configuration. Check https://github.com/torvalds/linux/blob/master/tools/testing/selftests/bpf/config for the list of Kconfig values that are relevant to BPF functionality. You most probably won't need all of them for libbpf-tools, though. But start with that and see.

[anakryiko]

Oh, and libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1 is just a warning and has no relation to this. This warning will go away once libbpf gets support for merging .rodata sections, for now just ignore it.

[yenk86]

@pfl Hello
Please I am starting with eBPF but I have the same issue you described up there.
I have tried you solution by changing the configurations inside the .config file, but the error stays.
I have cloned the project here : https://github.com/libbpf/libbpf-bootstrap

[yenk86]

That's the issue;
utrqins@utrqins-Latitude-E7470:~/Documents/test/libbpf-bootstrap/examples/c$ make
MKDIR .output
MKDIR .output/libbpf
LIB libbpf.a
MKDIR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/bpf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/btf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/libbpf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/libbpf_errno.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/netlink.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/nlattr.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/str_error.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/libbpf_probes.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/bpf_prog_linfo.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/btf_dump.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/hashmap.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/ringbuf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/strset.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/linker.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/gen_loader.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/relo_core.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/staticobjs/usdt.o
AR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/libbpf.a
INSTALL bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h bpf_helpers.h bpf_helper_defs.h bpf_tracing.h bpf_endian.h bpf_core_read.h skel_internal.h libbpf_version.h usdt.bpf.h
INSTALL /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/libbpf.pc
INSTALL /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output//libbpf/libbpf.a
BPF .output/usdt.bpf.o
MKDIR bpftool
BPFTOOL bpftool/bootstrap/bpftool
... libbfd: [ OFF ]
... disassembler-four-args: [ OFF ]
... zlib: [ on ]
... libcap: [ OFF ]
... clang-bpf-co-re: [ OFF ]
MKDIR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/include/bpf
INSTALL /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/include/bpf/hashmap.h
INSTALL /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/include/bpf/relo_core.h
INSTALL /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/include/bpf/libbpf_internal.h
MKDIR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/
MKDIR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/
MKDIR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/bpf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/btf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/libbpf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/libbpf_errno.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/netlink.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/nlattr.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/str_error.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/libbpf_probes.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/bpf_prog_linfo.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/btf_dump.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/hashmap.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/ringbuf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/strset.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/linker.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/gen_loader.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/relo_core.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/staticobjs/usdt.o
AR /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/libbpf/libbpf.a
INSTALL bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h bpf_helpers.h bpf_helper_defs.h bpf_tracing.h bpf_endian.h bpf_core_read.h skel_internal.h libbpf_version.h usdt.bpf.h
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/main.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/common.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/json_writer.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/gen.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/btf.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/xlated_dumper.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/btf_dumper.o
CC /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/disasm.o
LINK /home/utrqins/Documents/test/libbpf-bootstrap/examples/c/.output/bpftool/bootstrap/bpftool
GEN-SKEL .output/usdt.skel.h
libbpf: sec '.relusdt/libc.so.6:libc:setjmp': corrupted symbol #29 pointing to invalid section #65522 for relo #3
Error: failed to open BPF object file: BPF object format invalid
make: *** [Makefile:112: .output/usdt.skel.h] Error 95
make: *** Deleting file '.output/usdt.skel.h'

[anakryiko]

What's your Clang version? Try getting newer one.