docker run fail，Error attaching fanotify

[flyco2016]

【env】
Ubuntu 18.04 server
【cmd】
docker run --rm -it --privileged -p 9435:9435 -v /ebpf_exporter/examples:/examples -v /sys/fs/cgroup:/sys/fs/cgroup:ro ebpf_exporter --config.dir=examples --config.names=biolatency
【result】
2023/09/22 09:14:08 Error attaching fanotify, using on-demand resolution instead: error calling fanotify_init: invalid argument
2023/09/22 09:14:08 Error attaching exporter: error creating module from "examples/biolatency.bpf.o" for config "biolatency": open examples/biolatency.bpf.o: no such file or directory

[bobrik]

Fanotify is not an issue here, it falls back to the old on-demand mechanism.

This is an issue:

open examples/biolatency.bpf.o: no such file or directory

It looks like you didn't build examples before running:

make -C examples

[flyco2016]

thanks a lot.

I try to build examples, but got an error：

root@vcs-node0:/ebpf_exporter# make -C examples
make: Entering directory '/ebpf_exporter/examples'
clang -mcpu=v3 -g -O2 -Wall -Werror -D__TARGET_ARCH_x86 -idirafter /usr/local/include -idirafter /usr/lib/llvm-6.0/lib/clang/6.0.0/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -I../include/x86 -c -target bpf shrinklat.bpf.c -o shrinklat.bpf.o
error: unknown target CPU 'v3'
Makefile:23: recipe for target 'shrinklat.bpf.o' failed
make: *** [shrinklat.bpf.o] Error 1
make: Leaving directory '/ebpf_exporter/examples'

[bobrik]

Your clang 6.0 appears to be too old, which isn't surprising for Ubuntu 18.04. l don't think you'll have much success given your old environment, libbpf expects ubuntu 20.10 at least for BTF to work:

• https://github.com/libbpf/libbpf

You can try removing -mcpu=v3.