From: xu xin Replace silent WARN_ON_ONCE with WARN_ONCE that prints the actual error code from bpf_trampoline_unlink_prog(). This aids debugging of race conditions during link teardown, while keeping the warning rate limited to avoid log flooding. Signed-off-by: xu xin --- kernel/bpf/syscall.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 6db306d23b47..2348dc33abf4 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3626,10 +3626,13 @@ static void bpf_tracing_link_release(struct bpf_link *link) { struct bpf_tracing_link *tr_link = container_of(link, struct bpf_tracing_link, link.link); + int err; - WARN_ON_ONCE(bpf_trampoline_unlink_prog(&tr_link->link.node, - tr_link->trampoline, - tr_link->tgt_prog)); + err = bpf_trampoline_unlink_prog(&tr_link->link.node, + tr_link->trampoline, + tr_link->tgt_prog); + if (err) + WARN_ONCE(err, "bpf_trampoline_unlink_prog returns error: %d\n", err); bpf_trampoline_put(tr_link->trampoline); -- 2.25.1