On Fri, Jul 26, 2019 at 2:25 PM Andrii Nakryiko <andriin@xxxxxx> wrote:
>
> Libbpf stores associated BTF FD per each instance of bpf_program. When
> program is unloaded, that FD is closed. This is wrong, because leads to
> a race and possibly closing of unrelated files, if application
> simultaneously opens new files while bpf_programs are unloaded.
>
> It's also unnecessary, because struct btf "owns" that FD, and
> btf__free(), called from bpf_object__close() will close it. Thus the fix
> is to never have per-program BTF FD and fetch it from obj->btf, when
> necessary.
>
> Fixes: 2993e0515bb4 ("tools/bpf: add support to read .BTF.ext sections")
> Reported-by: Andrey Ignatov <rdna@xxxxxx>
> Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
Applied. Thanks
