kprobe not appearing in output, only kretprobe (in prospective kprobe_netlink example) about libbpf-bootstrap

[chenhengqi]

bpf_printk is a wrapper around bpf helper bpf_trace_printk.

The behavior and supported specifiers of bpf_trace_printk are well documented.

You can print return value of bpf_printk to debug the problem.

[chenhengqi]

Change:

bpf_printk("KPROBE netlink_unicast pid = %d, portid=%08x\n", pid, portid);

to:

bpf_printk("KPROBE netlink_unicast pid = %d, portid=%x\n", pid, portid);

Currently, only a small subset of format specifiers are supported by BPF.

[chrispsommers]

Awesome, that fixed it. Thanks! Given that there was no error while running the "broken" code, should I file another issue? Or was there some diagnostic output I overlooked?