[gentoo-user] libbpf? BTF? blinking urxvt/fish?

[caveman رَجُلُ الْكَهْفِ 穴居人]

i have 2 odd isuses that i observe:

(1) i get this error when i reboot my kernel:

    > libbpf: failed to find valid kernel BTF
    > libbpf: error loading vmlinux BTF: -3
    > libbpf: failed to load object 'iterators_bpf'
    > libbpf: failed to load BPF skeleton 'iterators_bpf': -3
    > Failed load could be due to wrong endianness

(2) plus all white texts are blinking in my
    urxvt/fish terminal

any idea what are these things?  never heard of
BTF.  never seen terminals blink like this.
what's going on?

ty,
cm.