libbpf: Loading kprobes fail on some distros

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Trying to load kprobes on ubuntu 4.15.0, I get the following error:
libbpf: load bpf program failed: Invalid argument

The same kprobes load successfully using bcc

After some digging, I found that the issue was with the kernel version
given to the bpf syscall. While libbpf calculated the value 265984 for
the kern_version argument, bcc used 266002.
It turns out that some distros (e.g. ubuntu, debian) change the patch
number of the kernel version, as detailed in:
https://github.com/ajor/bpftrace/issues/8

I didn't find a proper API in libbpf to load kprobes in such cases -
is there any?



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