register_jprobe always fails with -22

Naruto Nguyen <[email protected]>
Newsgroups org.kernel.vger.linux-trace-users,org.kernel.vger.linux-trace-devel
Message-ID <CANpxKHEVmPzxU5SwQV9Ka9z5f-8EYqS=eoD0XEqMkUVQ9tiTbw@mail.gmail.com> 
Hi everyone,

I tried to write a sample jprobe as the link
https://bugzilla.redhat.com/show_bug.cgi?id=1275809 (the sample is
attached in the link). However the function register_jprobes always
return -22 or -2. Could you please let me know what these errors means
and how to fix it?

Thanks,
Brs,
Naruto
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