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I can not call the kernel API find_task_by_pid_ns,
so I read the file /proc/kallsyms,I find only line:
c0476970 T find_task_by_pid_ns
I want to know which module includes it?
how to reload the module?

That's an internal kernel function, it doesn't belong to any module: http://lxr.free-electrons.com/ident?i=f ... _by_pid_ns